7 Best Lawn Mowers for Tall Grass in 2025

This cordless powerhouse redefines what’s possible without a gas engine, delivering 3200 RPM blade tip speed that slices through tall, thick grass like a hot knife through butter. With 50% more power than 40V systems, it tackles overgrown lawns with confidence, while the dual-port auto-switch technology seamlessly transitions to a second battery—perfect for yards pushing a half-acre. Say goodbye to fumes and pull cords; this mower starts instantly and runs 60% quieter than gas models, making weekend mowing a peaceful, eco-friendly chore.

In real-world testing, the 5.0Ah battery consistently powered through 45–60 minutes of dense grass, including patches over 6 inches tall, especially when mowing at the higher 3.9” setting in stages. The 21-inch steel deck provides wide coverage, reducing passes, and the IPX4 waterproof rating means it won’t flinch during unexpected drizzle. However, extremely wet, matted grass can cause minor clumping, requiring a second pass—common across most electric mowers. The aluminum handles and LED lights add durability and visibility, ideal for early morning or late evening mowing.

Compared to the PowerSmart B&S gas model, this Greenworks 60V offers quieter, cleaner operation with less maintenance, though it lacks self-propulsion. It’s a clear upgrade over lower-voltage cordless mowers like the Greenworks 40V 16”, offering more torque, longer runtime, and better cutting performance on tall grass. For homeowners with medium to large lawns who prioritize power and sustainability, this is the best overall electric option—delivering gas-like performance without the noise or fumes.

When tall, unruly grass demands brute force, this PowerSmart mower answers with a 140cc B&S engine that fires up smoothly and delivers relentless cutting power. The self-propelled rear-wheel drive is a game-changer on slopes and thick patches, letting you focus on steering while it powers through weeds and overgrowth. With a 21-inch steel deck and 6 height settings up to 3.9”, it handles aggressive cuts with precision—ideal for spring cleanup or neglected lawns. If you need a no-compromise gas mower for tough terrain, this is your workhorse.

In field tests, it powered through knee-high grass without bogging down, thanks to the robust overhead valve engine and large 10” rear wheels that maintain traction on uneven ground. The 3-in-1 system works flawlessly—mulching finely, bagging cleanly with the 1.4-bushel catcher, or rear-discharging for fast cuts. However, starting can be finicky in cold weather, and while the engine is reliable, it’s noticeably louder and heavier than electric alternatives. At full throttle, it’s best suited for open yards where noise isn’t a concern.

Next to the AMERISUN 21” gas mower, this model offers similar engine performance and deck size, but with smoother self-propel mechanics and better maneuverability. It outperforms all cordless models in sustained heavy-duty use, though it demands more maintenance and fuel. For homeowners with large, overgrown lawns who value raw power and self-propulsion, this is the best gas-powered choice—offering rugged durability and consistent performance where batteries fall short.

This ultra-lightweight cordless mower is a breath of fresh air for small yards, offering gas-like torque without the weight or fumes—perfect for users who dread mowing but still face patches of tall grass. At 35% lighter than standard models, it’s effortless to push and store, yet the 4.0Ah battery delivers 45 minutes of runtime, enough for lawns up to ½ acre. The single-lever height adjustment and 2-in-1 mulching/bagging make it versatile, while the <75dB operation keeps it neighbor-friendly—ideal for early weekend cuts.

During testing, it handled moderately tall grass (up to 5 inches) well, especially when mowed in two passes at a higher setting first. The 16-inch deck covers ground efficiently, though it requires more passes than wider 21-inch models. On dense, wet grass, it occasionally slowed, but never stalled—thanks to the brushless motor’s responsive torque. The real standout is the 75+ tool ecosystem; if you already own Greenworks 40V gear, this integrates seamlessly. However, it’s not ideal for consistently overgrown yards beyond half an acre.

Compared to the Greenworks 60V 21”, it’s less powerful and narrower, but far more manageable for older users or those with physical limitations. It beats the 24V models in runtime and cutting strength, making it the sweet spot for lightweight performance. For small to medium lawns where ease of use and quiet operation matter most, this is the best lightweight pick—balancing power, portability, and ecosystem value better than any other cordless option.

Don’t let the compact size fool you—this budget-friendly 24V mower packs a brushless motor that delivers surprising torque for its class, making it a hidden gem for small yards with occasional tall grass. The 3550 RPM no-load speed ensures clean cuts, while the rust-resistant poly deck withstands moisture and debris. With up to 30 minutes of runtime, it’s best suited for small lawns under a quarter-acre, but it starts instantly and requires zero maintenance—no gas, no oil, just plug and mow.

In real use, it performs well on grass up to 4–5 inches tall, especially when mowed in dry conditions and at a higher cutting height first. The 13-inch deck means more passes, and the runtime drops fast in thick patches, but the lightweight design and 5-position height adjustment make maneuvering easy. It excels in tight spaces and around flowerbeds, though it’s not built for marathon mowing sessions. The included 4.0Ah battery and charger add value, and the 3-year warranty offers peace of mind.

Against the LawnMaster 24V combo, this Greenworks model offers better build quality and cutting performance, though it lacks versatility. It’s no match for the 40V or 60V models in power or runtime, but it’s a solid entry-level electric mower. For budget-conscious buyers with small, manageable lawns, this is the best affordable cordless option—delivering reliable, emission-free mowing without breaking the bank.

This 2-in-1 cordless combo is a game-changer for small yard maintenance, bundling a 13-inch mower and 10-inch trimmer into one efficient system—perfect for tackling tall grass along edges and hard-to-reach spots. With 3,700 RPM mower speed and 9,200 RPM on the trimmer, it slices through overgrowth with surprising agility, and the dual 4.0Ah batteries ensure extended runtime for both tools. The trimmer converts to an edger, adding serious versatility for shaping borders and cleaning up after mowing.

In practice, the mower handles short to medium grass well, but struggles in very tall or wet patches due to the narrow deck and modest motor. The 22-minute runtime per battery is limiting for larger areas, but sufficient for spot mowing and edging. The real win is the pivot-assist handle and lightweight trimmer (under 6 lbs), making overhead trimming and tight-area work effortless. However, the mower’s 6.5-gallon bag fills quickly, requiring frequent emptying.

Compared to the Greenworks 24V 13”, this combo offers greater utility despite similar mowing specs—you get two tools for slightly more money. It’s not ideal for full-yard mowing, but for yard owners who need both mowing and trimming power, it’s unmatched in value. For small lawns with lots of edges and weeds, this is the best combo pick—delivering dual functionality and smart design that outshines single-tool alternatives.

This manual reel mower is a quiet, eco-conscious dream—perfect for short to medium grass on small lawns, though it’s not designed for tall, dense overgrowth. With a 14-inch, 5-blade steel reel, it delivers scissor-like precision cuts that promote lawn health, and the adjustable height (0.6–1.75”) adapts to seasonal needs. It’s emission-free and whisper-quiet, ideal for early mowing without disturbing neighbors or pets. For environmentally minded users with well-maintained lawns, it’s a sustainable, low-impact solution.

In testing, it performs best on grass under 4 inches tall, requiring a second, lower pass for a clean finish. It struggles in thick, wet, or uneven patches, and requires consistent pushing effort—especially on slopes. The large wheels and ergonomic U-handle reduce strain, and the grass catcher bag holds 70–80% of clippings, though some scattering is expected. It’s not a substitute for power mowers, but excels in small yards, courtyards, or driveways where noise and emissions matter.

Compared to electric models, it’s cheaper and maintenance-free, but lacks power for aggressive mowing. It’s ideal for light-duty use, unlike the Greenworks or PowerSmart models built for heavy grass. For eco-conscious homeowners with small, flat lawns who mow weekly, this is the best manual option—offering clean cuts, zero emissions, and quiet operation at a fraction of the cost of powered models.

The AMERISUN 21” gas mower stands out with its 144cc OHV engine and auto-choke ignition, making it one of the easiest gas mowers to start—a major win for users tired of pull-cord struggles. The 21-inch steel deck slices through tall, thick grass with authority, and the single-lever 6-position height adjustment (up to 3.9”) lets you customize the cut for any condition. With large 10” rear wheels and dual ball bearings, it rolls smoothly over rough terrain, making it a versatile performer for medium to large yards.

In real-world use, it powers through overgrown grass and weeds without hesitation, thanks to the air-cooled engine’s consistent output. The 3-in-1 system works flawlessly—mulching finely, bagging cleanly, or side-discharging for quick cleanup. It’s ready to mow out of the box, with no assembly tools needed, and the foldable handle saves storage space. However, like all gas mowers, it’s noisy and requires fuel mixing and seasonal maintenance—trade-offs for its raw power.

Against the PowerSmart B&S model, it offers nearly identical specs and performance, but with slightly better ergonomics and storage design. It outperforms all cordless models in sustained heavy mowing, though it lacks self-propulsion. For homeowners who want versatility, durability, and hassle-free startup, this is the best all-around gas mower—delivering professional-grade results with user-friendly features.