Are Zero Turn Mowers Safe on Hills? Slope Limits & Tips

Zero turn mowers are safe on hills only within the slope limit in your owner’s manual, which is 15 degrees for some Toro and Exmark models.

Why zero turn mowers are riskier on slopes

A zero turn steers by driving each rear wheel at a different speed, while the front casters just swivel. That design is great for tight trimming on flat ground and a problem on a grade.

• Casters give no steering grip. On a slope the front wheels can slide sideways, and you cannot steer with them the way you can on a tractor.
• Weight sits over the rear. Going uphill, the front end can get light. Going downhill, the casters can skid.
• Traction depends on two drive tires. If one loses grip, the mower can swing or slide instead of turning gently.
• Braking is by the drive wheels. Stopping hard downhill can break traction.

Wet grass, loose clippings and sudden turns make every one of these worse. Toro advises against mowing slopes in wet conditions because of lost traction.

How to measure your slope in degrees and percent

Do not guess. A slope that looks gentle often exceeds a rated limit. Use one of these methods on the steepest part you plan to mow.

1. Phone inclinometer: open a free level or inclinometer app, lay the phone’s long edge on a straight 4 ft board, and set the board along the fall line (straight up and down the hill). Read the angle.
2. Rise over run: lay a straight 10 ft board level, measure the gap from the board’s downhill end to the ground, and divide by 10.
3. Check several spots. Measure the top, middle and bottom, since slopes steepen near ditches and banks.

Worked example: a 2.5 ft drop over 10 ft is 2.5 ÷ 10 = 25% grade, which is about 14 degrees. A 3 ft drop over 10 ft is 30%, about 16.7 degrees.

Angle	Percent grade	Drop per 10 ft of run
5°	8.7%	0.9 ft
10°	17.6%	1.8 ft
15°	26.8%	2.7 ft
20°	36.4%	3.6 ft

Find your mower’s rated slope limit

There is no single number that covers every zero turn. Toro states never to operate one on slopes over 15 degrees, and Exmark gives the same 15 degrees, but your model, tires and attachments can change the rating. Your manual is the authority.

• Look in the Safety section under slope or hillside operation.
• Check the slope decal on the mower, often near the seat or fender.
• If the paper manual is gone, search the model number on the maker’s website for the PDF.
• Some manuals include a slope gauge diagram or a table. Use it instead of any number you read elsewhere.

If your measured angle is at or near the printed limit, treat it as too steep. The limit is a ceiling, not a target.

How to mow a slope with a zero turn, step by step

1. Walk it first. Look for holes, rocks, stumps and soft ground, and mark them.
2. Wait for dry grass. Skip dew, rain and anything slick.
3. Fasten the seat belt only if the ROPS is up. With the roll bar folded, the belt can trap you, so follow the manual.
4. Set a slow ground speed before you reach the slope, not on it.
5. Choose your direction. Texas and Mississippi State safety materials advise going up and down rather than across, so the mower is not tilted sideways. Toro leaves the choice to the operator, so follow your manual where it is specific.
6. Turn wide and gently. Avoid pivot turns, sudden steering and speed changes on the grade.
7. Stay away from edges. Exmark warns that mowing near drop-offs, retaining walls or water can cause serious injury or death if the mower rolls.

When not to use a zero turn on a hill

Skip the zero turn entirely when your measured slope is above the manual’s limit, the grass is wet, or the hill ends at a pond, ditch or wall. Exmark recommends a walk-behind mower or hand trimmer for ground steeper than 15 degrees.

• Walk-behind or push mower: you control it on foot and can stand uphill. Our guide to self-propelled mowers for hills covers that route.
• String trimmer: best for steep banks and edges near water.
• Ground cover or native plantings: removes mowing from the steepest sections.

Many yards split into two zones: mow the flat areas with a zero turn mower and handle the slope by other means.

What to do if the mower slides or tips

Stay calm and avoid the two common reactions, hard braking and sharp steering.

1. If the mower slides: ease off the throttle and steer gently straight down the slope if the manual allows and the path is clear. Disengage the blades.
2. If it begins to tip: stay in the seat with the belt fastened and the ROPS up, and hold the wheel firmly. Jumping off is how operators end up under the mower.
3. After any slide: stop on level ground and check the area before you mow it again. Consider a different tool for that spot.

With no ROPS and no belt, the safest plan is not to mow the slope at all.

Our Top Picks

Ready to shop? These are the top-rated options from our related roundup, Best Zero Turn Lawn Mowers of 2026.

As an Amazon Associate we earn from qualifying purchases. Product prices and availability are accurate as of the date/time indicated.

Related reading: How to Winterize a Battery Lawn Mower · The Best Lightweight Lawn Mowers of 2026

Frequently Asked Questions

Can I add wheel weights or wider tires to mow steeper hills?

Do not assume so. The rated slope limit comes from the manufacturer’s testing of the mower as built. Only approved weights or tires listed in your manual may change handling, and even then the printed limit stays the limit unless the maker says otherwise.

Is a zero turn riskier than a lawn tractor on a hill?

Generally yes, because a lawn tractor steers with front wheels that grip and turn. A zero turn relies on swiveling casters and two drive tires. Always compare the slope ratings in each manual, since they differ by model.

Can I mow right next to a pond or ditch if the ground is flat?

No. Rollover risk rises near edges, because wheels can drop or the bank can give way. Exmark warns of serious injury or death near drop-offs, walls and water. Trim those margins with a string trimmer instead.

What if I lost my manual and the slope decal is worn?

Find the model and serial number on the mower, then download the operator’s manual from the manufacturer’s website. Until you confirm the rating, keep the mower on flat ground only.

{“@context”: “https://schema.org”, “@type”: “FAQPage”, “mainEntity”: [{“@type”: “Question”, “name”: “Can I add wheel weights or wider tires to mow steeper hills?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Do not assume so. The rated slope limit comes from the manufacturer’s testing of the mower as built. Only approved weights or tires listed in your manual may change handling, and even then the printed limit stays the limit unless the maker says otherwise.”}}, {“@type”: “Question”, “name”: “Is a zero turn riskier than a lawn tractor on a hill?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Generally yes, because a lawn tractor steers with front wheels that grip and turn. A zero turn relies on swiveling casters and two drive tires. Always compare the slope ratings in each manual, since they differ by model.”}}, {“@type”: “Question”, “name”: “Can I mow right next to a pond or ditch if the ground is flat?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “No. Rollover risk rises near edges, because wheels can drop or the bank can give way. Exmark warns of serious injury or death near drop-offs, walls and water. Trim those margins with a string trimmer instead.”}}, {“@type”: “Question”, “name”: “What if I lost my manual and the slope decal is worn?”, “acceptedAnswer”: {“@type”: “Answer”, “text”: “Find the model and serial number on the mower, then download the operator’s manual from the manufacturer’s website. Until you confirm the rating, keep the mower on flat ground only.”}}]}