Mowers
What Size Mower for Three-Quarters of an Acre With Hills?
Quick answer
Three-quarters of an acre with hills needs a 30 to 42 inch lawn tractor rated for your slope, not a zero-turn. A 42 inch tractor takes about 43 minutes on hilly ground, compared with 35 on flat. The Husqvarna TS 120 42 in. fits. Drive straight up and down slopes, and trim banks beyond the manual's limit.
At three-quarters of an acre, you need a rider, and hills decide which kind. A lawn tractor steers with its front wheels and brakes through the transmission, so it holds a line on a grade better than a zero-turn, which steers and brakes only through its rear drive wheels. On a wet slope, a zero-turn's rear tires can slide and take away both steering and braking at once.
The computed recommendation for this page is a 30 to 42 inch lawn tractor. Before you buy, measure the steepest slope you actually mow and compare it with the manual of the model you are considering.
On this page
- How long does it take to mow a hilly three-quarter acre?
- How do I measure the slope of a large yard?
- What is the best riding mower for 3/4 acre with hills?
- Why is a lawn tractor better than a zero-turn on hills?
- Should I mow a hill up and down or across on a riding mower?
- What if a bank is too steep for my tractor?
- Which mowers suit a hilly three-quarter acre?
How long does it take to mow a hilly three-quarter acre?
| Mower | Time per mow | Fit for this lawn |
|---|---|---|
| 21 in walk-behind | 2 hr 8 min | Slow for this size |
| 30 in rider | 60 min | Recommended |
| 42 in lawn tractor | 43 min | Recommended |
| 46 in lawn tractor | 39 min | Larger than needed |
| 48 in zero-turn | 26 min | Zero-turn: not advised on slopes |
| 54 in zero-turn | 23 min | Zero-turn: not advised on slopes |
| 60 in zero-turn | 21 min | Zero-turn: not advised on slopes |
Recommended deck: 30 to 42 inches, lawn tractor rated for your slope (front-wheel steering holds a line on grades better than a zero-turn). Times assume typical cutting speeds (3 mph walk-behind, 4.5 mph tractor, 6.5 mph zero-turn), a 15 percent overlap and 65 percent efficiency for this terrain.
How do I measure the slope of a large yard?
For long slopes, use a string line. Drive two stakes 10 feet apart down the slope, tie a string to the uphill stake at ground level, level it with a line level and measure how high the string sits on the downhill stake. That height in inches, divided by 120 and multiplied by 100, is the percent slope.
| Rise over 10 ft | Slope percent | Degrees | On a three-quarter acre |
|---|---|---|---|
| 12 in | 10 percent | 5.7 | Lawn tractor up and down, within the manual limit |
| 18 in | 15 percent | 8.5 | Tractor up and down only if the manual allows it; walk-behind across |
| 24 in | 20 percent | 11.3 | Walk-behind across with firm footing; many riders not allowed here |
| 36 in | 30 percent | 16.7 | Trimmer, or a robot like the Mammotion LUBA 2 AWD 3000X Robot Mower (80 percent, 0.75 acre) |
Degrees = arctangent of percent / 100. Check your manual for its exact limit. Many manuals state it in degrees, so use this table to compare.
What is the best riding mower for 3/4 acre with hills?
A 42 inch lawn tractor. The Husqvarna TS 120 42 in. Lawn Tractor is the budget choice. The EGO POWER+ T6 TR4204 42 in. Electric Lawn Tractor is an electric tractor rated for 1.5 acres per charge, with cruise control and a rear hitch, and it has plenty of runtime margin for climbing on this lot. The Husqvarna TS 120 46 in. Lawn Tractor adds 4 inches of deck and saves about 4 minutes, but a wider, heavier machine is less welcome on side hills. Whichever you choose, read its slope limit before buying, not after.
Why is a lawn tractor better than a zero-turn on hills?
The difference comes down to how each machine steers and brakes on a grade.
| 42 in lawn tractor | 42 in zero-turn | |
|---|---|---|
| Time per mow, hilly 3/4 acre | 43 min | 30 min |
| Steering | Front wheels, steering wheel | Rear drive wheels, lap bars |
| Braking | Transmission and brake pedal | Rear drive wheels only |
| On wet grass on a grade | Front wheels still steer if the rear slips | Rear slip can remove steering and braking together |
| Hitch for a cart or sweeper | Common | Often not designed for towing |
The zero-turn is faster, but the manual slope limit and wet-grass behavior matter more than 13 minutes on a hilly lot.
Should I mow a hill up and down or across on a riding mower?
Up and down, never across. A rider driven across a slope carries its weight toward the downhill wheels and can tip sideways. Up-and-down passes are less efficient, since you turn at the top and bottom of every strip and slow down on the climb. That is part of why the hilly lot runs about 23 percent slower than a flat one (43 minutes versus 35). With a walk-behind, the rule reverses: mow across, so the mower cannot roll onto you.
What if a bank is too steep for my tractor?
Leave it to a walk-behind across the slope, a trimmer, or a robot. A rear-drive mower like the SENIX 22 in. Variable Speed RWD Self-Propelled Gas Mower, 201cc handles moderate banks. The Mammotion LUBA 2 AWD 3000X Robot Mower is rated for 80 percent slopes on up to 0.75 acre, so it could cover this entire lot. For a bank too steep to stand on, a trimmer from the top edge or a groundcover planting is the answer. See how to mow slopes safely.
Which mowers suit a hilly three-quarter acre?
Lawn tractors first, plus a rear-drive walk-behind for banks and a slope-rated robot. See the best mowers for hills.
Husqvarna TS 120 42 in. Lawn Tractor
$2,799.00A 19 HP, 540cc Briggs & Stratton engine, 42-inch twin-blade stamped deck and pedal-operated transmission, the lowest-cost way onto a seat in this list.
Best for: Smaller, fairly flat properties
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EGO POWER+ T6 TR4204 42 in. Electric Lawn Tractor
$4,399.00Six included 6.0Ah batteries power a 42-inch tractor rated for up to 1.5 acres per charge, with cruise control, a rear tow hitch and belt-free dual blade motors.
Best for: Up to 1.5 acres for buyers who want a steering wheel and a hitch
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Husqvarna TS 120 46 in. Lawn Tractor
$3,185.00A 22 HP Briggs PXi engine with a Tuff Torq hydrostatic transmission and a 46-inch 2-blade deck, rated at 5 mph forward.
Best for: Mid-size lawns with some obstacles
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Greenworks 80V 25 in. Self-Propelled Mower Kit
$717.27A 25-inch deck with a brushless motor and rear-wheel drive, rated to cut up to three quarters of an acre on the included 4.0Ah battery.
Best for: Open lawns approaching an acre
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SENIX 22 in. Variable Speed RWD Self-Propelled Gas Mower, 201cc
$509.99Variable-speed rear-wheel drive and a single-handle, four-wheel synchronized height adjuster sit on a 201cc, 22-inch 3-in-1 platform with a 2-year warranty.
Best for: Larger yards where you want to set your own pace
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Mammotion LUBA 2 AWD 3000X Robot Mower
$1,998.00Four-wheel drive climbs 80% slopes, RTK plus AI vision handles mapping and edge cutting, and a 15.8-inch dual-blade disc covers up to 0.75 acre, with 4G tracking.
Best for: Sloped lawns up to 3/4 acre
Check price on AmazonHow we chose
We did not test these products in person. Picks are researched from manufacturer specifications and owner manuals, engine and safety certifications where they apply, warranty terms, public recall records, and the recurring themes in verified owner reviews. We favor established brands with large review counts and parts support, match each pick to a real yard size or task, and place it in the tier where its price and capability actually belong.
Frequently asked questions
Can I use a zero-turn mower on a hilly yard?
Only within the operator manual limits and on dry grass, and many hilly lots exceed them. Zero-turns steer and brake with their rear drive wheels, so if those wheels slide on a wet or steep slope you lose both steering and braking. A lawn tractor that steers with the front wheels holds a line better, which is why this page recommends one for a hilly three-quarter acre.
How long does it take to mow a hilly three-quarter acre?
About 43 minutes with a 42 inch lawn tractor at 4.5 mph and about 1 hr with a 30 inch rider, using 65 percent efficiency for hills. The same lot on flat ground takes about 35 minutes with the 42 inch tractor. Steep strips you mow with a walk-behind or trimmer add their own time on top.
What slope can a lawn tractor safely mow?
Whatever the operator manual allows, and no more. Limits vary by model and are usually given in degrees, so convert: 10 percent is about 5.7 degrees, 15 percent about 8.5 and 20 percent about 11.3. The limit assumes dry, firm grass and driving straight up and down. Wet grass, a full bagger or a towed load lowers the safe limit.
Researched, not professional advice. This page is compiled from published specifications, manuals, labels and owner-review consensus, not hands-on testing. Follow the manufacturer's instructions and product label, and consult a qualified professional where safety, chemicals, fuel or structures are involved. As an Amazon Associate we earn from qualifying purchases.