8 Best Cutting 21″ Lawn Mowers to Buy in 2025

Blazing through thick turf, the EGO POWER+ LM2134SP-2 feels downright commanding thanks to its Select Cut multi-blade system and Touch Drive self-propel. The dual 56V 6.0Ah batteries deliver up to 100 minutes of runtime, which meaningfully reduces mid‑mow interruptions for 1/3–1/2 acre lots. A 21-inch deck, 8 height settings (1–4 inches), and a high‑efficiency brushless motor combine to solve two big pain points: cut quality and fatigue on longer jobs.

In testing, the EGO handled spring growth with confident suction for mulching and clean bagging, while the variable 0.9–3.1 MPH drive made pace control intuitive on slopes. The 3‑in‑1 deck transitions smoothly between mulching, bagging, and side discharge, and LED headlights genuinely help in low light. It’s heavier than push-only models, and the self-propel’s strongest setting can nibble runtime on thick lawns, but the dual-battery setup offsets that for most yards.

Against the Greenworks 40V self-propelled, the EGO LM2134SP-2 wins on runtime and cut customization, though the Greenworks is lighter and stores vertically. Compared with the EGO LM2135SP, this model’s two-pack battery kit is better for larger lawns or back-to-back cuts. Ideal for homeowners wanting a gas-beating cordless with long runtime and refined controls; feature-for-feature, it out-muscles the Greenworks while edging the LM2135SP on endurance.

Punchy and straightforward, the PowerSmart 21-inch 125cc mower leans on a B&S 4-stroke OHV engine to deliver a reliable, crisp cut without the complexity. At roughly 62 lbs, it’s easy to maneuver in tight areas and around landscaping, a boon for small yards and first-time owners. The 2-in-1 setup (mulch/side discharge) and 6-position height range (1.5–3.9 inches) cover the basics cleanly.

In use, the 21-inch deck works best on small to medium lawns with moderate growth; mulching performance is respectable if you keep the blade sharp and pace reasonable. Side discharge helps maintain momentum when grass gets taller. There’s no bagger included in the 2‑in‑1 spec and no self-propel, so hills and larger lots demand more push effort.

Compared with the EGO LM2101 push electric, the PowerSmart offers gas power with low upfront complexity, while the EGO wins on maintenance ease and noise. Against the MightyMow 40V self-propelled, this PowerSmart is lighter and simpler but lacks the convenience of drive assist. Best for budget-minded buyers with flat, smaller lawns who want a no-fuss gas cut; versus Greenworks 40V, you trade cordless convenience for straightforward power and a lighter push.

Confident and polished, the EGO LM2135SP brings Select Cut multi-blade precision and Touch Drive finesse to a 21-inch platform that rivals gas without the fumes. The included 56V 7.5Ah battery provides up to 60 minutes of runtime, ideal for most 1/4–1/3 acre lots. With 0.9–3.1 MPH adjustable speed and 7 cutting heights (1.5–4 inches), it’s built to dial in turf height and control.

In real-world mowing, the brushless motor maintains blade speed well through dense patches, producing even mulching and strong bagging suction. The push-button start and LED headlights boost convenience, while the 3‑in‑1 system transitions quickly. Heavier grass and frequent self-propel use can shorten runtime; one battery means fewer back-to-back yards unless you add a spare.

Compared with the EGO LM2134SP-2, you’re trading some runtime endurance for a more compact kit; performance is otherwise similar. Versus Greenworks 40V, the EGO delivers stronger torque and finer cut quality but is a bit heavier. Perfect for homeowners who want a premium cordless experience with top-tier cut quality and ergonomic control; feature-for-feature, it outperforms the Greenworks while undercutting the LM2134SP-2 on included energy reserves.

Nimble and efficient, the Greenworks 40V self-propelled mower delivers up to 45 minutes on a 5.0Ah pack with a durable 21-inch steel deck and brushless motor. The rear-wheel drive self-propel adds traction, and 7-position height control makes it adaptable for season-to-season tuning. It’s a maintenance-light option with vertical storage that saves serious garage space.

On medium lawns with weekly cuts, it mulches well and bags cleanly, with noise levels comfortably lower than gas. The 3‑in‑1 setup and single-lever height adjust streamline operation, though dense spring growth can tax the single 5.0Ah battery before finishing 1/2 acre. Self-propel pace is steady, but sustained hills and heavy loads reduce runtime.

Against the EGO LM2135SP, the Greenworks is lighter and more storage-friendly, but the EGO offers more torque and longer sustained blade speed in thick turf. Compared to MightyMow 40V, Greenworks has a more refined deck and brand ecosystem, while MightyMow offers longer claimed runtime. Ideal for value seekers who want self-propelled cordless convenience without the premium tax; feature-wise, it slots between MightyMow’s endurance and EGO’s power.

Built for traction and torque, this PowerSmart self-propelled gas mower uses a 140cc B&S engine and rear-wheel drive with 10-inch wheels to climb slopes confidently. The 21-inch steel deck and 6-position height adjust (1.5–3.9 inches) target medium to large yards that demand throughput. With 3‑in‑1 capability and a 1.4-bushel bag, it’s a practical all-rounder for mixed mowing styles.

On hills and uneven terrain, grip is solid, and the engine maintains speed through thicker patches, making it well-suited to bumpy, challenging lawns. Mulching is effective with weekly maintenance cuts, while bagging capacity minimizes trips to empty. It’s louder and heavier than cordless units, and maintenance (fuel, oil) is part of the deal—but power delivery is consistent.

Compared with the EGO LM2134SP-2, you trade cordless quiet and low maintenance for hill-climbing traction and continuous runtime. Versus Greenworks 40V, this mower is stronger on slopes but lacks the convenience of vertical storage and low-noise operation. If you have hilly terrain and want reliable mechanical drive and gas torque, this model is purpose-built; for feature breadth and finesse, the EGO family leads.

Clean and uncomplicated, the EGO LM2101 is the best push electric pick for those prioritizing low maintenance with a quality cut. The 56V 5.0Ah battery yields up to 45 minutes of runtime, plenty for small to mid-size lots with routine upkeep. A 21-inch deck, 6 height settings (1.5–4 inches), and 3‑in‑1 capability give it real versatility without the weight of a drive system.

In testing, it starts instantly and glides through weekly growth, with mulching that keeps clippings fine when blade sharpness is maintained. Bagging performance is strong for a push model, and IPX4 weather resistance plus LED headlights add practical touches. Without self-propel, steeper slopes and thick, wet grass require more effort, and single-battery runtime won’t suit larger properties.

Compared with Greenworks 40V, the EGO LM2101 provides stronger torque per pass and similarly quiet operation, though Greenworks adds self-propel. Against the EGO LM2135SP, you’re sacrificing drive assist and some convenience for lighter handling and simplicity. Ideal for owners with relatively flat yards who want push-mower control and cordless reliability; feature-for-feature, it’s a cleaner option than the budget gas PowerSmart for maintenance and noise.

Clever airflow and smart power management set the WORX Nitro WG752 apart. Aerodeck boosts internal air volume to reduce clumping and elevate bag fill, while Intellicut auto-adjusts blade speed for thick grass. With twin 20V 5.0Ah packs (40V total), a 21-inch deck, and 7-position height control (1.5–4 inches), it’s built for clean cuts and bagging efficiency.

On suburban lawns up to 1/2 acre, the Nitro maintains blade speed surprisingly well for a push mower, delivering especially tidy collection in leafier or damp conditions. Mode switching between mulch/bag/rear discharge is fast, and the collapsible handle makes vertical storage easy. As a push unit, hills require effort, and sustained high Intellicut output will shorten runtime.

Versus the EGO LM2101, WORX wins on bagging performance thanks to Aerodeck, while EGO offers stronger raw torque. Against Greenworks 40V self-propelled, WORX is more efficient at filling the bag but gives up drive assist. Best for homeowners focused on clog-free bagging and compact storage; feature-for-feature, it’s a smarter bagger than Greenworks but lacks the self-propel convenience.

Endurance-focused and surprisingly punchy, the MightyMow 40V pairs a brushless motor up to 3500 RPM with a 21-inch steel deck to cover bigger lawns without constant charging. With two 8.0Ah batteries, it claims up to 60 minutes self-propelled or 75 minutes push, making it a standout for long runtime on a budget. The 2.0–4.3 ft/s variable self-propel and 6-position height (1–3 inches) keep pace and cut consistent.

In practice, it tracks well on moderate slopes and keeps airflow strong for bagging due to boosted return airflow design. Mulching is competent with weekly cuts, though extremely tall or wet grass can bog it down and reduce runtime faster. The 1–3 inch height ceiling is shorter than rivals, limiting taller summer cuts in heat-prone regions.

Compared with Greenworks 40V, MightyMow delivers longer runtime and a faster top walking speed, while Greenworks offers broader height range and brand ecosystem polish. Against EGO LM2135SP, you sacrifice peak torque and refined controls for endurance value. Ideal for buyers prioritizing long cordless runtime and self-propel at a budget; feature-for-feature, it outlasts Greenworks but can’t match EGO’s cut finesse.