10 Signs to Check Your Lawn Mower Blade Sharpness
Notice your lawn looking a little uneven? That could be a sign it's time to sharpen your lawn mower blade.
Our editors and experts handpick every product we feature. We may earn a commission from your purchases.
Lutai Razvan / EyeEm/Getty Images
Uneven Grass Height
An uneven lawn is an obvious sign something might be off with your lawn mower blade. If fixing the alignment or tightening it doesn’t work, it might be time to sharpen the blade.
mathieukor / Getty Images
Mowing Areas Multiple Times
A dull mower blade can force you to make several passes in the same area. If this happens routinely, that’s an obvious sign to sharpen or replace the blade.
It’s Taking Longer to Mow
Longer mow times may not mean you’re out of shape or dawdling in the yard. It could be your mower isn’t moving as swiftly through the grass as it used to. Here are some tips to make sure you’re mowing the most efficient way.
You Need to Push the Mower Harder
For push or walk-behind mower owners, dull blades can turn simple lawn care into a full-blown workout. Check the sharpness of your blades if mowing the lawn becomes more strenuous.
Torn, Not Sliced, Grass Blades
Sharp mower blades cut grass evenly. Dull blades won’t give you that clean yard look. You can learn a lot by examining the cut of your grass blades. Is the mower properly cutting the grass or yanking it out of the ground? Jagged tips mean it’s time for a sharpened blade.
Pro tip: Use the Sharpal Knife Sharpener to sharpen dull blades in a flash.
JJ Gouin/Getty Images
The Blade is Dented or Bent
Sometimes the easiest way to tell if there’s a mower blade issue is looking at the blade itself. Blades can get damaged over time. If there are any sizable dents or if the blade is bent, it needs to be sharpened or completely replaced.
A wide range of issues can cause a lawn mower to stall. Here’s one: Dull blades that force the engine to overwork. If the mower stalls through thick grass areas, try sharpening the blade to see if that fixes the problem.
A mower with a dull blade can leave yellow or brown patches on your lawn, leaving it susceptible to diseases.
Blade Pulls Up Chucks of Grass or Dirt
Rather than cleanly slicing through grass, a dull blade can not only pull clumps of grass from your lawn, but some dirt as well. The blade should always slice the grass, not pull.
It’s Been Awhile
Lawn mower blades should be sharpened every 20 to 25 hours of use time, according The Home Depot. If you’d rather not sharpen the blade, they’re not overly expensive to replace.