Hills are where robot mowers differ the most. A two-wheel-drive mower rated for 30% will stall or slide on a bank that an all-wheel-drive model climbs without trouble. Getting this right matters more than any other spec if your yard isn't flat.
- Steepest ratingSegway Navimow X4 SeriesFrom $2,499 ↓
- Best for hills with treesMammotion LUBA 3 AWDFrom $2,399 ↓
- Best value for hillsDreame A3 AWD ProFrom $1,699.99 ↓
- Best for moderate slopesMammotion YUKA mini 2 1000H$1,399 ↓
What slope ratings mean
Makers list slope as a percentage: feet of rise per 100 feet of run. Percent and degrees are easy to confuse, and the difference is large.
| Slope % | Degrees | What it looks like |
|---|---|---|
| 10% | 5.7° | Gentle grade most mowers handle at the map edge |
| 20% | 11.3° | Typical sloped front yard |
| 30% | 16.7° | Steep enough to feel on foot |
| 45% | 24.2° | Hard to push a mower up |
| 80% | 38.7° | Too steep for a riding mower |
| 84% | 40° | Highest rating we found (Navimow X430) |
Measure your slope
Lay a straight 4 ft board on the steepest part of the hill with a level on top. Lift the downhill end until the board is level, then measure the gap to the ground in inches. Divide by 48 and multiply by 100 for the slope percentage. A 10 in gap is about 21%.
Several mowers list a lower limit at the edge of the map, where they turn. The Navimow i110 is rated 30% inside the lawn but 10% at the boundary, and the GOAT O1000 RTK is 45% inside but 17% at the boundary. If your slope runs right to the edge of the lawn, use the boundary figure.
The best mowers for slopes
1. Segway Navimow X4 Series
X430 (1 acre): $2,499 · X450 (1.5 acres): $2,999
The X430 is rated for 84% (40°), the highest figure we found, with all-wheel drive, dual suspension and front-wheel steering. It also crosses obstacles up to 2.8 in.
- Price
- From $2,499
- Max slope
- 84% (40°) on the X430
- Lawn size
- 1.0 acre (X430) or 1.5 acres (X450)
- Drive
- All-wheel drive with front steering
Why we like it
- 84% slopes
- AWD with suspension
- 1 to 1.5 acres
Keep in mind
- $2,499 and up
- Satellite-led navigation
2. Mammotion LUBA 3 AWD
1500: $2,399 · 3000: $2,799 · 5000: $3,299
Hilly lots often come with tree lines. The LUBA 3 pairs an 80% rating and all-wheel drive with LiDAR, RTK and cameras, so it keeps both its grip and its position.
- Price
- From $2,399
- Max slope
- 80% (38.6°)
- Lawn size
- 0.37 to 1.25 acres by model
- Drive
- All-wheel drive
Why we like it
- 80% slopes
- Three navigation systems
- Up to 1.25 acres
Keep in mind
- From $2,399
3. Dreame A3 AWD Pro
2500: $1,699.99 sale ($3,099.99 list) · 3500: $2,599.99 · 5000: $2,999.99
The A3 AWD Pro 2500 delivers an 80% rating and all-wheel drive at $1,699.99 on sale, covering 0.62 acre.
- Price
- From $1,699.99
- Max slope
- 80% (38.7°)
- Lawn size
- 0.62 to 1.2 acres by model
- Drive
- All-wheel drive
Why we like it
- 80% slopes for under $1,700 on sale
- Wide 15.8 in cut
Keep in mind
- Sale price may change
- No RTK
4. Mammotion YUKA mini 2 1000H
Optional 4G module: $129
For a small yard with banks up to 45% (about 24°), the YUKA mini 2 is the most affordable LiDAR mower that handles them.
- Price
- $1,399
- Max slope
- 45% (24°)
- Lawn size
- 0.25 acre
- Drive
- Two-wheel drive
Why we like it
- 45% slopes
- No antenna
Keep in mind
- Two-wheel drive
- Quarter-acre limit
Is it safe to run a robot mower on a steep hill?
Within its rating, yes. All these mowers stop the blades when lifted or tipped. Wet grass reduces traction, so pause mowing after rain on steep banks.
What if part of my yard is steeper than any rating?
Mark it as a no-go zone in the app and handle it with a string trimmer, or replant it with ground cover that doesn't need mowing.