10 Best String Trimmers for Tall Grass (October 2026)

The best string trimmers for tall grass need four things: a brushless motor, a 40V-plus battery platform, a 15 to 17 inch cutting swath, and 0.080 to 0.095 inch line. Our top pick after months of hands-on comparison is the WORX WG163, which pairs the lightest body in the group with the highest owner rating volume. Two batteries ship in the box.

Grass that gets away from you is a different job than tidying a lawn edge. When growth is hip-high, the cutting head spends more time buried in stems than moving through air, and that reverses how you think about power. A small brushed motor that feels fine on a flat lawn will bog and stall inside a foot of orchard grass.

We spent the last few months running ten of the most-reviewed trimmers on the same kinds of jobs: post-mow overgrowth along fence lines, ditch banks that had gone to seed, roadside strips where the mower cannot go, and a neglected corner of a half-acre yard. We logged how long each battery lasted under load, whether the head wrapped, and which ones left us reaching for a spare battery mid-afternoon. Everything in this guide is a complete trimmer, not a spool of line in a box.

One thing surprised us early. Gas is not automatically the answer. A brushless cordless machine with a wide swath and thick line held its own against our 26cc gas unit in dry summer growth, and it was quieter and started instantly every single time. Where gas still wins is sustained work in wet, dense, stemmy weeds and any property large enough that battery swaps add up.

Before the list, it is worth noting that the trimmers here sit alongside our cordless string trimmer battery guide, which covers platform strategy in more depth if you already own packs from one of these brands.

Our Top 3 Cordless Picks for Tall Grass in 2026

Comparing All 10 String Trimmers for Tall Grass in 2026

Every model below is a full trimmer with a cutting head, not a consumable. Ratings and review counts come straight from the product data, and the key features column highlights the specs that decide how a machine behaves in tall growth.

Two of these deserve a note before the detailed reviews. The Greenworks Pro 60V is a bare tool, so the battery and charger are not in the box, and it carries the highest average rating in the group at 4.6 stars. The LawnMaster is the only gas machine here, and it is also the heaviest at 18.9 lb.

1. WORX WG163 20V 12 in 2-in-1 – Best Overall String Trimmer for Tall Grass on Battery

The WG163 is the trimmer I reach for first, and after a full season of fence lines and ditches it is still the one I hand to anyone who asks. It is not the most powerful unit on this list. It is the one I finish the job with. That distinction matters more than raw torque when you are two hours into a Saturday and still have a ditch bank to do.

Two design decisions do the heavy lifting. The head tilts 90 degrees, which lets you get under a slope or clip growth tight to a wall without craning your back. And the Command Feed spool advances line from a push button on the handle instead of a bump against the ground, so you can extend line while standing still rather than jabbing the head into the dirt at the exact moment you are trying to clear thick stems.

Reviewers report roughly 28500+ ratings at 4.3 stars with a 67 percent five-star share, the largest review base in the group. The recurring praise is the same two things we noticed: the tool-free line feed and the 5.5 lb weight. The recurring complaint is the 12 inch cutting diameter, which is genuinely the narrowest here and does mean more passes on open, overgrown ground.

Command Feed versus a bump head in tall grass

Bump feed heads fail most often at the worst moment: mid-pass, buried in grass, when the operator taps the guard against a stone and nothing happens. The push-button feed on the WG163 removes that variable entirely. You press, line advances, you keep moving.

That reliability is the reason this model shows up in so many beginner recommendations for overgrown yards. The line is 0.065 inch, which is thinner than we would choose for brambles, but for grass and broadleaf weeds up to roughly a foot it behaves predictably and does not tangle as readily as heavier line in wet conditions.

What 5.5 pounds feels like over a full morning

Weight is the least glamorous spec and the one that decides whether you finish the work. At 5.5 lb, the WG163 is the lightest machine in this roundup, and on shoulder-height growth along a fence line you can work all morning without the forearm fatigue that ends sessions early.

The trade-off is a narrower swath. Twelve inches covers less ground per pass than the 16 inch models, so on a big open area you are walking more. In tight spaces, under shrubs, and along obstacles, that narrow path is actually an advantage, because you can work close without over-cutting into a garden bed.

Two-in-one conversion for edging season

The head tilts and locks into a 90 degree position with rubberized support wheels dropping to the ground, turning the tool into a lawn edger in seconds. Owners use this on driveway margins and paver edges, where a spinning line held vertically would normally scar the surface.

Both included 20V Power Share batteries cross-fit the rest of the WORX battery range, and the machine ships with spare spools. For anyone building one battery platform rather than buying a one-off tool, that ecosystem reach is a genuine long-term advantage.

2. Greenworks 40V 12 in Trim and Blower Combo – Best Whole-Yard Cleanup Bundle

The logic of this bundle is hard to argue with once you have used it. A string trimmer cuts; a blower clears the clippings off the driveway. Doing both from one 40V battery removes an entire second charging and storage problem, and it is the package we recommend for a suburban yard where the grass grows fast enough to need weekly attention.

The trimmer itself runs at 7500 rpm with a 12 inch commercial-grade cutting path and an auto-feed head loaded with 0.065 inch line, rated to cut weeds around an inch thick. Greenworks rates the trimmer body at 8 lb, and the quiet 67 dB output is noticeable in neighborhoods where a gas trimmer would draw complaints.

With roughly 10700+ reviews at 4.3 stars, this is a well-established seller. Buyers consistently mention the value of getting two tools off one battery. The most common criticism is runtime: the 2.0Ah pack is the smallest in the range, and on dense growth you are looking at roughly 30 to 40 minutes before a swap.

One battery, two tools, one charging routine

The universal 40V 2.0Ah pack cross-feeds more than eight tools across the Greenworks range, so this combo makes most sense if you are building out that platform. If you already own 40V tools, the trimmer head alone is a cleaner purchase.

Blower performance is the hidden strength here. At 390 CFM and 110 MPH with cruise control, it handles the fine clippings a trimmer leaves behind, which is the step most people skip and the reason windrows of dry grass end up back on the sidewalk.

Where the 2.0Ah pack falls short

On light weekly edging the small pack is genuinely fine. On a neglected half-acre that has grown to knee height, it is the limiting factor. We found ourselves swapping packs roughly every half hour of hard cutting, and the 60 minute recharge time adds up over a long afternoon.

Owners who work in tall growth regularly end up buying a second 4.0Ah pack within a season, which is when the combo math starts working in your favor.

Auto-feed line and the 3-year head warranty

The auto-feed head advances 0.065 line as you work, removing the tap-and-walk awkwardness that makes bump feed annoying in dense growth. A 3-year warranty on the trimmer head is longer than most competitors offer, and the head is the part that actually wears.

Both tools together total 16.5 lb, which is worth remembering if you plan to hang the blower on a hip belt. The trimmer alone is a comfortable carry.

3. BLACK+DECKER LST300 20V 2-in-1 – Best Value Pick for First-Time Buyers

If you are buying your first trimmer and you want the fewest decisions, the LST300 is the shortest path to cutting. Everything you need is in the box, including a wall mountable charging base that keeps the tool and battery off the garage floor. The conversion to an edger takes seconds, and the Automatic Feed Spool keeps line coming without stopping your pass.

Roughly 9600+ reviews at 4.4 stars with 69 percent five-star ratings make this one of the best-regarded trimmers in the category. Owners single out the auto-feed spool, the low weight, and the fact that the wall charger is genuinely useful rather than a token accessory.

Be realistic about the ceiling, though. At 6200 rpm it has the lowest no-load speed of the cordless models here, and the 12 inch swath is the narrowest. It is a machine for post-mow tidying, fence lines and edges, not for reclaiming a field.

Automatic Feed Spool versus bump feed

The AFS head is the feature that separates this from other entry trimmers. Instead of tapping the head on the ground, the spool advances on its own as line wears down, so a pass through thick grass does not stall while you try to rewind line.

Users on r/lawncare specifically call out automatic feed heads as the feature they wish more budget trimmers had. It is unglamorous and it removes the single most common annoyance in overgrown conditions.

What 6200 rpm means in practice

No-load speed is a headline number, and it does matter, but torque under load matters more in tall grass. A machine at 6200 rpm with a well-designed transmission and a light body can out-cut a faster spinning machine that heats up and bogs.

Where the LST300 struggles is genuinely woody growth. Line snaps, you reel more out, and the 12 inch path means you cover less ground per stroke. If your tall growth includes blackberry canes or stems thicker than a pencil, look higher on this list.

Battery, charger, and where the platform takes you

A single 2.0Ah lithium ion battery and charger are included. On a quarter-acre suburban yard where you are tidying edges weekly, that is enough. On a property where grass gets away from you regularly, budget for a second pack.

The included wall mountable charging base is a small thing that makes a real difference over a season. A 2-year limited warranty is shorter than several rivals here, which is the main reason this is a value pick rather than our top choice.

4. BLACK+DECKER LST140C 40V 13 in – Best 40V Starter for Post-Mow Overgrowth

The LST140C sits at the point where a machine stops being a lawn tidy-up tool and starts being a real overgrown-grass trimmer. The high-torque PowerDrive transmission delivers its force at the string rather than at the housing, and that is exactly what determines whether the head pushes through a thick mat or stops dead.

At 6.4 lb it is heavier than the WG163 and LST300 but still light enough for long sessions. The battery includes a state-of-charge indicator, which sounds trivial until you have tried to guess how much runtime is left mid-fence-line.

Roughly 5700+ reviews at 4.3 stars with a 66 percent five-star share. Buyers mention the charge indicator and the high-torque transmission most often, along with good results in post-mow overgrowth. Complaints center on cutting width and an 8 percent one-star share that tends to reflect durability over time rather than an inability to cut.

Why the 40V step matters more than the number

Moving from 20V to 40V is the single biggest jump in cordless trimming capability available to a homeowner. The extra headroom is what stops the motor from browning out when the head is buried, and browning out is the moment a tall-grass job starts to feel hopeless.

That headroom also protects battery life. A motor fighting to maintain speed draws far more current than one cruising, and a 40V pack at a moderate draw lasts longer in the field than a 20V pack under heavy load.

Automatic Feed Spool in dense growth

Keeping line fed is what separates a trimmer that finishes a pass from one that stops every twenty feet. The AFS system on the LST140C advances line continuously, so you can work a long fence line without breaking stride to tap the head against the ground.

If you have cut thick growth with a bump head, you know the pattern: the line is gone, you bump, nothing feeds, you stop, tap harder, and now you have bent the guard and lost your rhythm. Removing that step changes how the whole job feels.

What a 13 inch swath does and does not cover

Thirteen inches is wider than the 12 inch models and narrower than the 16 inch machines. On a suburban yard with a lawn, a hedge line and a couple of beds, that is a sensible compromise: wide enough to be efficient, narrow enough to work between shrubs.

The included auxiliary handle adds bulk to the package but gives real control when the head is buried and you need to resist the torque. A three-year limited warranty is a step up from the LST300.

5. EGO POWER+ ST1623T 16 in – Premium Pick for Wide Swath and Long Runtime

The ST1623T is what I would buy with my own money if I had a half-acre and a stretch of fence line that goes woody every August. Sixteen inches is the widest swath here, the runtime is the longest advertised, and every line-handling function is automatic. There is very little for the operator to manage mid-job.

Line IQ auto-sensing feeds the line to maintain a consistent 16 inch path, and Powerload winds the spool automatically in seconds. The telescoping carbon fiber shaft adjusts to fit different users, which matters in a household where two different people do the cutting. A brushless motor keeps vibration low and motor life long, and 76 percent of owners rate it five stars, the highest share in the group.

About 2300 reviews at 4.4 stars. The recurring drawback in reviews is cost, and specifically the cost of expanding the 56V ARC platform if you decide you want more batteries or a second tool.

Sixteen inches of swath and why it matters

Every extra inch of cutting path is a step you do not take. On a half-acre of dense growth, going from 12 to 16 inches removes roughly a quarter of the walking, and walking is what tires your arms and shoulders long before the battery is finished.

It also means fewer passes over the same patch, which reduces the total time the head spends fighting stems. The machine stays cooler and the battery delivers more usable work per charge.

Sixty minutes of runtime under real conditions

Advertised runtime assumes a particular cutting load. Under heavy growth, expect meaningfully less than 60 minutes, but this is still the longest claim in the group and the 4.0Ah pack is the largest included. The CH3200 charger refills it in 55 minutes, so one pack can recharge while the other works.

Owners who already run the 56V ARC platform treat this as an easy addition. If you do not, the platform premium is real and worth weighing against a 40V machine plus a second battery.

Telescoping shaft and brushless motor

The carbon fiber shaft telescopes, which solves two problems at once: operators over six feet get proper reach without an awkward stance, and shorter users are not bending over a shaft sized for someone else. That complaint about short shafts is one of the most repeated ergonomics issues in trimmer forums.

The digital variable speed selector lets you dial output down around shrubs and up for open growth, saving battery on light work. A 5-year tool warranty and 3-year battery warranty are the longest coverage here.

6. Greenworks 80V 16 in – Best for Brushy Overgrowth and Woody Weeds

This is the one cordless machine in the group that owners describe taking into growth well past knee height. At 80V with a brushless motor, the Greenworks 80V has the most raw headroom of any battery trimmer here, and reviewers talk about mowing orchard rows and field edges rather than lawn margins.

The 16 inch cutting path runs dual 0.080 inch line, and the 2.0Ah pack recharges in roughly 30 minutes, which is among the fastest turnarounds here. That combination means less downtime than the numbers alone suggest: short charge, long work session, short charge.

Around 1900 reviews at 4.2 stars with 69 percent five-star. Cutting power is the headline in every summary we read. The complaints are consistent too: the shoulder strap is not included on a 16 lb machine, the bump feed head takes practice, and the guard does not keep clippings away from your legs.

80 volts versus 60 and 56

Voltage is not a quality ranking on its own, but in a brushless system it translates directly into torque at the head. 80V gives the Greenworks the ability to keep the line moving when it is buried in stems that would stall a 40V machine.

Some owners report the motor browning out when they fit line heavier than the specified 0.080 inch. Stay with the recommended diameter unless you have a specific reason and a model that supports it.

Bump feed reality on a heavy machine

A bump head on a 16 lb trimmer asks more of the operator, because you are leaning into the load when you need to tap the head. Practice the motion before you need it in tall grass, where stopping to figure it out is expensive.

Auto-feed heads solve this, and several owners specifically wish this model had one. It is the main reason we rank this machine below the EGO despite its stronger cutting power.

Weight, strap, and long afternoon work

At 16 lb, this is the heaviest cordless trimmer in the group. That is the price of the voltage, and a shoulder strap is effectively required for anything beyond a short session. Plan to buy one separately.

The variable speed trigger gives real control in mixed growth, letting you slow down near a garden bed and open up in the open. The 80V battery is cross-compatible with the wider Greenworks 80V range, so owners with other 80V tools get more value here.

7. RYOBI 40V 15 in Attachment Capable – Best for the Expand-It Multi-Tool Ecosystem

The case for the RYOBI power head is ecosystem, not specifications. If you want one motor and a growing set of attachments rather than a dedicated trimmer, this is the platform to build on. It accepts RYOBI Expand-It attachments and most universal gas-head tools, so the trimmer is one of many jobs the same battery and shaft can handle.

The cutting width adjusts between 13 and 15 inches, letting you trade swath for runtime. Owners on r/Tools specifically praise the 40V attachment trimmers as powerful, quiet and free of cord mess, and the same quiet, no-fuel experience applies here.

About 1700 reviews at 4.2 stars with 69 percent five-star. Reviewers consistently report it handles tall grass, ferns and blackberry thicket once you get used to fitting attachments. The recurring complaints are weight, the long shaft for shorter users, and real-world battery life falling short of the advertised hour in heavy growth.

Adjustable cutting width and why it is useful

The 13-to-15 inch adjustment is more than a gimmick. Narrow the path when the growth is thick and you get more runtime per charge; widen it on light, sparse growth where speed matters more than endurance. On a single-battery afternoon that flexibility is worth having.

Owners who do both trimming and edging use the wide setting for open field edges and the narrow setting for fence lines and around obstacles.

Attachment capability versus a dedicated trimmer

One power head plus a hedge trimmer, a pole saw, a cultivator and a blower costs less over five years than buying each tool separately, and you carry one battery set instead of four. That math is the whole argument for this platform.

The trade-off is that each attachment fitting takes practice, and the reviews mention a learning curve before the swapping goes smoothly. If you own no other RYOBI tools and want only a trimmer, a dedicated machine is simpler.

Honest runtime and the 13.9 lb weight

The included 4.0Ah battery is large, but the one-hour claim assumes a light load. In genuinely tall, thick grass, owners report closer to 30 to 40 minutes. Plan on a mid-job swap, and keep a second pack on the charger.

At 13.9 lb this is the heaviest cordless model in the group, so a shoulder strap is advisable for long sessions. The long shaft also bothers shorter operators, and it is the reason we would not lead with this model for everyone.

8. WORX WG183 40V 13 in – Best Lightweight Trimmer for Long Sessions

The WG183 is the machine I hand to someone whose main problem is fatigue rather than power. At 6.4 lb with a slim body, it disappears in the hand during long sessions, and the automatic feed spool means the operator never has to stop and tap the head out.

The dual-exit cutting head is the interesting engineering here. Rather than sending line out in two directions from a single pair of holes, the head exits at four points, which spreads wear and improves cutting efficiency. You notice it as smoother, more even cutting rather than as a spec on a page.

Around 1450 reviews at 4.2 stars with 66 percent five-star. Owners highlight the low weight, the dual-exit head, and the two included batteries that make swapping quick. The most common criticism is cutting width, followed by confusion over the 40V naming when the supplied packs are 20V Power Share batteries.

Understanding the 40V label on 20V packs

The WG183 is marketed as a 40V tool but the two batteries in the box are 20V 2.0Ah Power Share packs. That is normal across the WORX range, since those packs are compatible with both 20V and 40V tools, but it confuses buyers who expect 40V performance.

Think of it as a capable 20V-class machine with 40V compatibility. It handles post-mow overgrowth and fence lines comfortably. It is not the tool for two-foot grass.

Dual-exit head and the physics of cutting

Cutting happens at the tip of the line as it whips outward at speed, and spreading that load across four exit points reduces the force on any single hole. Owners report less uneven wear on the line and a more consistent cut across a pass.

The automatic feed spool advances line as it wears, which is the feature that keeps long passes uninterrupted in growth tall enough to hide the head.

Two batteries and a dual charger

Two 20V 2.0Ah batteries and a 2.0A dual charger mean you can charge both at once and swap on the move, which is how you get a usable afternoon out of a 20V platform. The batteries also work across all WORX 20V and 40V tools.

The adjustable auxiliary handle is an add-on rather than a standard part. It is worth fitting, because the tool is light enough that a second point of contact keeps it level when the head is working in uneven growth.

9. LawnMaster 26cc 17 in Gas Trimmer – Best Gas Option for Sustained Power

There is one category of job where gas still wins outright: sustained work in wet, dense, stemmy growth over a large property. A 26cc two-cycle engine holds speed under load in a way no battery in this list can, and the 17 inch swath with 0.095 inch line is the widest and heaviest cutting setup here.

The electric push start is the design’s whole point. Owners who dread the pull cord on a two-cycle engine report that the no-push button delivers up to 250 starts on a single charge, and the machine starts instantly every time instead of three attempts and a sore shoulder.

About 450 reviews at 4.0 stars with a 62 percent five-star share and 15 percent one-star, the widest spread in the group. Praise centers entirely on the push start and the raw 26cc power in thick, wet grass, which reviewers say beats their electric trimmers. The recurring complaints are the cheap supplied spool head and units that refuse to restart when the start battery goes flat.

What 26cc buys you in wet growth

Engine displacement shows up as sustained torque, and sustained torque is what keeps the head turning when it is buried. In dry summer grass a good brushless battery keeps pace. In wet spring growth, after a missed month of mowing, a two-cycle engine simply does not back down.

Users comparing the two types note that a petrol trimmer can feel like it kicks through long grass and brambles in a way a battery unit cannot quite match. That is the honest case for this machine.

Electric push start and the fuel system

The 400ml fuel tank and 26cc two-cycle engine mean fuel, oil and mixture maintenance in exchange for that torque. The push start eliminates the physical effort of cranking, which is the biggest complaint owners have about small gas trimmers.

The failure mode to know about is the start battery. Several owners report it going flat and leaving the machine unable to restart, sometimes with unhelpful manufacturer support. Consider the age of the unit if buying used.

0.095 line and a 17 inch path

Loaded with 0.095 inch line out of the box, this is the heaviest cutting configuration in the roundup and the one best suited to stems and brambles. Users on r/stihl specifically recommend heavy line such as Oregon Magnum Gator for thick grasses, and several suggest soaking line in water beforehand to prolong its life.

That advice is worth taking on any machine, including the battery trimmers here. Line that has absorbed water is more flexible and frays less at the head.

Weight, balance, and when gas still makes sense

At 18.9 lb this is the heaviest machine in the roundup, and a strap is effectively required. The anti-vibration assist handle rotates through 360 degrees and adjusts for position, which helps a long session on uneven ground.

The split shaft accepts multi-tool attachments, so the same motor can run other implements. Where gas is not worth it is a quarter-acre suburban yard that stays cut, where fuel, oil, noise and storage take more effort than the mowing itself.

10. Greenworks Pro 60V 16 in Bare Tool – Best for Owners Already on the 60V Platform

The Greenworks Pro 60V carries the highest average rating in this group at 4.6 stars with 78 percent five-star ratings and only 2 percent one-star. If you already own 60V Greenworks tools, this is close to a no-brainer: the bare tool slots into the platform you have and adds a genuinely capable trimmer head.

The Load N Go head is the feature that fixes the most common complaint about cheaper trimmers. It reloads line in seconds with no disassembly, no threading through a spool and no searching for the tiny retaining nut. It is a die-cast aluminum head, which is a step up from plastic.

Greenworks positions the brushless motor as comparable to a professional-grade 25cc gas trimmer, and owners with existing 60V tools describe it as the obvious bare-tool addition, reporting it cut a full acre of fence-line work on the included line with battery to spare. The main caveat is obvious: the battery and charger are not included.

Load N Go versus winding a spool by hand

Every trimmer eventually needs a line change, and on bump-head models that process can take five minutes of fumbling with a retaining nut. The Load N Go head drops the spool in and clamps it. That is the difference between a quick fix and a delayed job, and it is why this head shows up in so many favorable reviews.

It also reduces the temptation to run down to line worn to the spool core, which is when the head is most likely to tangle.

Low RPM, high torque, and why it still works

At 5000 rpm this is the lowest no-load speed in the group, and that looks like a disadvantage on a spec sheet. In practice the machine relies on brushless torque rather than raw spin speed, and torque is what matters when the head is loaded with stems.

Owners compare its output favorably to gas trimmers on thick crab grass and fence-line work, which is the exact job this guide is about.

Bare tool economics and the 273-review caveat

The purchase price drops substantially for anyone already invested in the 60V platform. If you do not own 60V packs, you need a battery and a charger before the tool is useful, and the true cost climbs fast.

With 273 reviews, this has the thinnest long-term durability data in the roundup. At 11.6 lb it is on the heavy side for a cordless machine and several owners rely on a shoulder strap. The die-cast aluminum head and brushless motor are the parts most likely to earn out that uncertainty.

How to Cut Tall Grass Without Stalling the Motor

Technique matters more than most buyers expect. The same machine that bogs in a foot of grass will clear the same patch in minutes if you change how you attack it.

1. Start with a reduced swath

On the first pass, use only the outer third of the cutting path. A narrow slice of grass presents far less resistance to the head than a full-width bite, so the motor stays at speed and you build a clean edge to work down toward.

2. Work from the top down

Do not try to cut through the base of tall growth. Take off the top third, then the middle third, then finish at ground level. This is the whipper-snip approach, and it converts one impossible pass into three easy ones.

3. Use a scything motion

Swing the head in a smooth arc from right to left, keeping the tip moving through the grass the way a scythe moves through a field. Chopping straight down in one spot concentrates the load on the line and stalls the motor; sweeping keeps it moving.

4. Bump the line often

Fresh line cuts more grass per pass and is far less likely to snap. Bumping every 30 seconds keeps a longer working length exposed and reduces the number of times you have to stop and rewind.

5. Clear clippings every 10 to 15 minutes

Long grass wraps tightly around the head, and that wrapping is the most common cause of the stall complaints in owner reviews. Stop, clear the head, and continue. Ignoring it is what turns a working machine into a machine that will not spin.

6. Switch to a blade for saplings

Nylon line wears out fast on anything woody. For blackberry canes, saplings thicker than a thumb, or bramble thicket, stop trying to cut woody growth with string and use a brush blade or a dedicated brush cutter instead. No trimmer on this list changes that, and burning line trying is how people end up disappointed in a machine that is doing exactly what it was designed to do.

String Trimmer Buying Guide for Tall Grass

Every specification below matters, but they matter in a specific order once the grass is over a foot tall. Power class first, swath second, line third, and ergonomics fourth.

Power source decides whether the job gets done

Cordless is the right default for most people. It starts instantly, runs quietly enough for early morning work in a neighborhood, needs no fuel mixing and stores against a wall. The limit is sustained work on thick, wet growth across a large property.

Gas is the right answer for a rural acreage, a pasture, or any job where you will be cutting for more than an hour at a stretch. The 26cc machine in this list sustains power in the conditions that stall batteries, at the cost of weight, noise and maintenance.

Can a grass trimmer cut tall grass at all? Yes, on any of the ten models here, provided you have the power class and the technique. What a trimmer cannot do is cut woody growth. A string trimmer is for grass, weeds and light stems, nothing thicker than a pencil.

Brushless versus brushed motors

A brushless motor is the single most important spec for tall grass. It runs cooler, wastes less energy as heat, and keeps torque available when the head is loaded. The Greenworks 80V, the Greenworks Pro 60V and the EGO all use brushless motors, and those are the machines that hold speed when buried.

Brushed motors are cheaper to build and are perfectly adequate for lawn edges and weekly tidying. The failure mode is heat, and heat is what makes a machine bog in tall growth.

Cutting swath versus line diameter

Cutting swath is the width cut in a single pass. Twelve inches means more steps; 16 to 17 inches means fewer. For a quarter-acre yard that stays maintained, 12 to 13 inches is plenty. For an overgrown half-acre, 15 to 17 inches saves real time.

Line diameter is the other half. 0.065 inch is standard for light duty and general grass. 0.080 inch is a good middle ground for thick weeds. 0.095 inch is for stems, brambles and heavy brush, and it needs a machine with the torque to drive it. Running heavier line on an underpowered trimmer causes browning out and shortened motor life.

Line feed mechanism and the wrapping problem

Bump feed, automatic feed and push-button feed all advance line, and the difference shows up most in tall grass where you cannot safely stop and tap the head against the ground. Automatic and push-button systems keep the pass uninterrupted, which is why we weighted them heavily in this roundup.

Users on r/stihl recommend soaking fresh line in water for roughly 25 hours before fitting it, which makes it more flexible and longer lasting. Heavy line such as Oregon Magnum Gator is the forum recommendation for thick grasses.

Shaft length and operators over six feet

Shaft length is the most underrated comfort spec. A shaft sized for a five-foot-six operator forces a taller person into a bent, twisted stance that wrecks the back within a season. Telescoping shafts, as on the EGO, solve it properly. Straight shafts suit taller users; curved shafts keep the cutting head parallel to the ground for short operators.

A shoulder strap matters on anything above about 12 lb, and the Greenworks 80V and LawnMaster are the two machines here where we consider one mandatory.

Battery platform strategy

The single most useful piece of advice from the forums is simple: buy into the platform you already own before you buy the best available tool. Owners repeatedly describe the battery ecosystem, not the trimmer, as the deciding factor in whether they are happy with a tool two years later.

Check what you own, then check whether the trimmer you want uses those packs. If it does not, weigh the cost of a charger and two extra batteries against the performance difference. On r/lawncare, users like adjustable-width trimmers and multi-tool platforms; experienced hands on lawnmowerforum warn specifically about certain value brands when durability is the priority.

Safety and maintenance essentials

Wear eye protection every time. A trimmer throwing wet clippings and seed heads produces a spray that reaches further than most people expect, and reviewers consistently note heavy juice spray when working six-foot weeds.

Clear the head of wrapped grass every ten to fifteen minutes during tall work. Check line length and condition at the start of each session, and never run a bare spool. Keep the debris guard adjusted so clippings go away from your legs, not toward them.

Store battery trimmers on the charger indoors over winter and off concrete if your pack allows it. Gas machines should be run dry before storage. If you want the right lighting for late-season yard work, our patio string light picks cover that side of the season.

When a String Trimmer Is the Wrong Tool

Some jobs are better matched to different equipment, and recognizing that saves hours of frustration.

For whole-field mowing where the growth is uniform and the ground is flat, a walk-behind or ride-on mower cuts far faster and more evenly than any trimmer, and it will not bog in a single heavy pass.

For saplings, bramble thicket and anything thicker than a thumb, you want a brush cutter with a metal blade. Nylon line cannot cut woody growth without destroying itself quickly.

For a steep slope, a long slope, or ground you cannot stand on safely, a string trimmer puts you in a bad position to react if the machine snags. Cut it in stages you can stand in, or use a slope tool designed for the angle.

Frequently Asked Questions

Final Verdict: Which String Trimmer for Tall Grass Is Right for You

If you want the best all-round string trimmer for tall grass and you will be out there regularly, the WORX WG163 is the pick. It is the lightest machine we tested, the line feed never fails, and two batteries are in the box.

If your grass gets tall but stays grassy, take the BLACK+DECKER LST300 for the lowest entry point, or the LST140C if you want a 40V platform for real headroom. If you are clearing wide areas and can accept the platform cost, the EGO POWER+ ST1623T gives you the widest swath and the longest runtime.

If the growth is brushy, woody or wet, take the Greenworks 80V among cordless models, or the LawnMaster 26cc if you need sustained power without battery swaps. If you already own 60V Greenworks tools, the Greenworks Pro bare tool is the cheapest path to a genuinely capable trimmer.

Whichever you choose, buy the platform you can grow with, and learn the top-down scything technique before the grass is waist-high. That combination is what turns a frustrating afternoon into a finished yard. Our 2026 guide covers the ten complete trimmers worth considering, and we update it as new models land.