Will a robot mower handle your hill?
Measure the steepest stretch of your yard, then pick from the mowers rated above that number. Type the number in below and the list shrinks to the ones that fit.
Start with one of these
Robot mowers by slope rating
Four models side by side. The rating on each was matched against a second publisher before it went on the page.
How to measure your slope
A tape measure, a level and ten minutes. Includes a calculator and a chart for switching between percent and degrees.
Wire-free mowers on a hill
What gets harder when there is no boundary wire and the ground tilts, from the reviewers who tried.
What this site has not done
Nobody here has mowed a hill with these machines. The slope ratings are the makers' own numbers. The checking so far confirms that each number was copied correctly, not that the mower holds that angle on a wet lawn. If a rating is shaky, the page says so, and if two sources disagree, the number stays off the site.