Keeping your lawn neat and tidy starts with choosing the right mower. If you’re searching for the best 21-inch lawn mower, you’ve landed in the perfect spot! A 21-inch cutting deck strikes an ideal balance—wide enough to cover ground quickly, yet nimble enough to navigate tight spaces. Whether you prefer gas-powered muscle, eco-friendly battery options, or budget-friendly reliability, this roundup review covers the top contenders for 2025. I’ve dug into the details, tested the performance, and sifted through user feedback to bring you a clear, easy-to-read guide. Let’s dive in and find the perfect mower for your yard!
Contents
- Why Choose a 21-Inch Lawn Mower?
- Our Top Picks for the Best 21-Inch Lawn Mowers
- How We Chose the Best 21-Inch Lawn Mowers
- Gas vs. Battery-Powered 21-Inch Mowers: Which Is Right for You?
- Key Features to Look for in a 21-Inch Lawn Mower
- Comparing the Top 21-Inch Lawn Mowers: A Quick Glance
- Tips for Maintaining Your 21-Inch Lawn Mower
- Which 21-Inch Lawn Mower Should You Buy?
- Final Thoughts on the Best 21-Inch Lawn Mowers
Why Choose a 21-Inch Lawn Mower?
Before we explore the top picks, let’s talk about why a 21-inch mower might be your best bet. This size offers versatility for small to medium lawns, typically up to half an acre. The wider deck reduces mowing time compared to smaller models, while still being manageable for most homeowners. Plus, many 21-inch mowers come packed with features like self-propulsion, adjustable cutting heights, and mulching capabilities—making them a go-to for lawn care enthusiasts. Ready to see which models stand out? Let’s get started!
Our Top Picks for the Best 21-Inch Lawn Mowers
Here’s a curated list of the best 21-inch lawn mowers available in 2025. I’ve included a mix of gas, electric, and battery-powered options to suit different needs. Each review highlights key features, pros, cons, and why it might be the right fit for you.
1.PowerSmart 21-Inch 3-in-1 Gas Lawn Mower (170cc)
The PowerSmart 21-Inch 3-in-1 Gas Lawn Mower kicks off our list with a bang. Powered by a robust 170cc engine, this mower delivers reliable performance for tackling thick grass and uneven terrain. It’s a self-propelled model, so you won’t break a sweat pushing it uphill. With six cutting height adjustments (1.18 to 3 inches), it adapts to your lawn’s needs effortlessly.
Key Features
- Engine: 170cc gas-powered
- Cutting Options: Mulching, side discharge, and bagging
- Self-Propelled: Rear-wheel drive for easy maneuvering
- Deck: Durable steel construction
- Weight: 70 lbs
Pros
- Starts quickly with minimal effort
- Handles overgrown grass like a champ
- Affordable price for a gas mower
Cons
- Assembly can take a bit of time
- Slightly noisy compared to electric models
Why It’s Great
This mower shines for homeowners who need power and versatility without spending a fortune. The 3-in-1 design lets you mulch, bag, or discharge clippings, giving you full control over lawn maintenance. If you’ve got a medium-sized yard with some hills, this PowerSmart model won’t disappoint.
2.EGO Power+ LM2135SP 21-Inch Self-Propelled Lawn Mower
For those leaning toward battery-powered mowers, the EGO Power+ LM2135SP steals the show. This self-propelled beauty runs on a 56V 7.5Ah battery, delivering up to 60 minutes of runtime. Its Touch Drive technology lets you control speed with a simple grip, and the Select Cut multi-blade system ensures a pristine cut every time.
Key Features
- Power: 56V lithium-ion battery (7.5Ah)
- Cutting Options: Mulching, bagging, side discharge
- Self-Propelled: Variable speed control
- Deck: High-strength polymer
- Weight: 82 lbs
Pros
- Quiet operation—no earplugs needed!
- Powerful enough to rival gas mowers
- Folds up for easy storage
Cons
- Higher upfront cost
- Battery life may vary with thick grass
Why It’s Great
The EGO Power+ blends eco-friendliness with top-tier performance. It’s perfect for medium lawns and homeowners who value quiet, low-maintenance mowing. If you’re tired of gas fumes and oil changes, this mower offers a refreshing upgrade.
3. BILT HARD 21-Inch Gas Lawn Mower (170cc)
The BILT HARD 21-Inch Gas Lawn Mower brings serious power to the table with its 170cc engine. This push mower boasts 10 cutting height positions (1.2 to 3.8 inches), giving you unmatched flexibility. It’s a 3-in-1 model, so you can mulch, bag, or side-discharge clippings with ease.
Key Features
- Engine: 170cc gas-powered
- Cutting Options: Mulching, bagging, side discharge
- Height Adjustment: 10 positions
- Deck: Steel construction
- Weight: 65 lbs
Pros
- Wide range of cutting heights
- Sturdy build for long-term use
- Excellent value for the price
Cons
- Push design requires more effort on hills
- Grass bag fills up quickly
Why It’s Great
This mower excels for detail-oriented gardeners who want precise control over grass length. Its rugged design handles tough lawns, and the price keeps it accessible. If you don’t mind a little workout, this BILT HARD mower delivers big results.
4. SENIX 21-Inch Self-Propelled Gas Lawn Mower (150cc)
Rounding out our list, the SENIX 21-Inch Self-Propelled Gas Lawn Mower offers a 150cc engine for dependable power. Its self-propelled rear-wheel drive tackles slopes with ease, and the 6-position height adjustment (1.25 to 3.75 inches) keeps your lawn looking sharp. The 3-in-1 system adds flexibility for clippings management.
Key Features
- Engine: 150cc gas-powered
- Cutting Options: Mulching, bagging, side discharge
- Self-Propelled: Rear-wheel drive
- Deck: Steel build
- Weight: 68 lbs
Pros
- Smooth self-propulsion on uneven ground
- Easy-to-adjust cutting heights
- Reliable engine performance
Cons
- Slightly heavier than some competitors
- Bag could be larger
Why It’s Great
The SENIX mower balances power and convenience, making it ideal for medium lawns with varied terrain. Its self-propelled feature takes the strain off your arms, and the sturdy build promises years of use. If you want a gas mower that’s easy to handle, this one’s a winner.
How We Chose the Best 21-Inch Lawn Mowers
Selecting the top mowers wasn’t a random process. I evaluated each model based on several key factors to ensure they meet real-world needs. Here’s what I considered:
- Performance: How well does it cut grass, especially thick or overgrown patches?
- Ease of Use: Is it simple to start, adjust, and maneuver?
- Durability: Will the deck and engine hold up over time?
- Features: Does it offer mulching, bagging, or self-propulsion?
- Value: Does the price match the quality and functionality?
- User Feedback: What do real customers say about their experience?
By weighing these criteria, I narrowed down the list to mowers that deliver consistent results and satisfy a range of preferences.
Gas vs. Battery-Powered 21-Inch Mowers: Which Is Right for You?
Choosing between gas and battery-powered mowers can feel overwhelming. Let’s break it down to help you decide.
Gas-Powered Mowers
- Pros: More power for tough lawns, longer runtime with refueling, often cheaper upfront
- Cons: Noisy, requires maintenance (oil, gas, spark plugs), emits fumes
- Best For: Larger yards, thick grass, or budget buyers
Battery-Powered Mowers
- Pros: Quiet, eco-friendly, low maintenance, easy to start
- Cons: Limited runtime, higher initial cost, less power in some cases
- Best For: Small to medium lawns, eco-conscious users, noise-sensitive areas
For example, the PowerSmart 170cc and SENIX 150cc dominate in raw power, while the EGO Power+ LM2135SP excels in quiet, clean operation. Think about your lawn size, terrain, and priorities to pick the right type.
Key Features to Look for in a 21-Inch Lawn Mower
Not all mowers are created equal. Here are the must-have features to ensure you get the most bang for your buck:
- Cutting Height Adjustments: Look for at least 5-6 positions to customize your lawn’s look.
- Self-Propulsion: Saves effort on slopes or large yards—variable speed is a bonus.
- Clipping Management: Mulching, bagging, and side discharge options add versatility.
- Deck Material: Steel lasts longer; polymer is lighter and rust-resistant.
- Engine or Battery Power: Match the power source to your lawn’s demands.
These features enhance performance and make mowing less of a chore. Keep them in mind as you shop!
Comparing the Top 21-Inch Lawn Mowers: A Quick Glance
Still unsure which mower suits you? Here’s a side-by-side comparison:
| Model | Power Source | Self-Propelled | Cutting Options | Weight | Price Range |
|---|---|---|---|---|---|
| PowerSmart 170cc | Gas (170cc) | Yes | Mulch, Bag, Side | 70 lbs | $$ |
| EGO Power+ LM2135SP | Battery (56V) | Yes | Mulch, Bag, Side | 82 lbs | $$$$ |
| BILT HARD 170cc | Gas (170cc) | No | Mulch, Bag, Side | 65 lbs | $$ |
| SENIX 150cc | Gas (150cc) | Yes | Mulch, Bag, Side | 68 lbs | $$ |
This table simplifies your decision-making. For power and affordability, gas wins. For quiet and convenience, battery takes the lead.
Tips for Maintaining Your 21-Inch Lawn Mower
Owning a great mower is just the start—keeping it in top shape ensures years of flawless cuts. Follow these tips:
- Gas Mowers: Check oil levels before each use, clean the air filter monthly, and sharpen blades annually.
- Battery Mowers: Charge the battery fully after each use, store it indoors, and avoid over-discharging.
- General Care: Clear grass clippings from the deck after mowing, store in a dry place, and inspect for wear.
Regular maintenance boosts performance and extends your mower’s lifespan. A little effort goes a long way!
Which 21-Inch Lawn Mower Should You Buy?
Let’s wrap this up with some tailored recommendations:
- Best Overall: EGO Power+ LM2135SP—Perfect for power, quietness, and ease of use.
- Best for Tough Lawns: PowerSmart 170cc—Tackles thick grass and hills effortlessly.
- Best Value Gas: BILT HARD 170cc—Great features at a reasonable price.
- Best for Slopes: SENIX 150cc—Self-propulsion makes inclines a breeze.
Your choice depends on your lawn size, budget, and preferences. Can’t decide? The EGO Power+ LM2135SP offers the best all-around experience for most users.
Final Thoughts on the Best 21-Inch Lawn Mowers
Finding the best 21-inch lawn mower doesn’t have to be a chore. Whether you crave the raw power of gas or the clean efficiency of battery, this roundup has you covered. The PowerSmart 170cc delivers muscle on a budget, while the EGO Power+ LM2135SP brings cutting-edge tech to your yard. Each mower on this list shines in its own way, so pick one that matches your needs and start mowing with confidence!
Ready to transform your lawn? Click those “Check Price on Amazon” buttons and grab your perfect mower today. Happy mowing!
