Check mower blades during mowing season and sharpen them when grass tips look ragged, torn, or brown after mowing. Dull blades tear grass instead of cutting it cleanly.
Quick blade checklist
- Look at grass tips after mowing.
- Check for ragged, shredded, or brown edges.
- Inspect the blade for dullness, chips, or bends.
- Disconnect the spark plug on gas mowers before working near the blade.
- Remove the battery on electric mowers before working near the blade.
- Balance the blade after sharpening.
Why sharp blades matter
University of Illinois Extension says sharp blades cut grass, while dull blades bludgeon, rip, and tear grass blades. Torn grass has a harder time recovering and can be more vulnerable to disease.
Safety before touching anything near the blade
Before removing mower blades, Illinois Extension says to disconnect the spark plug, or remove the battery for electric mowers, to prevent accidental engagement of the blades.
When to sharpen
There is no single schedule for every yard. Sandy soil, sticks, rough ground, and frequent mowing dull blades faster. Use the cut quality as the signal, then set a reminder that fits your season.
Good maintenance rhythm
- Inspect blades at the start of mowing season and every few weeks during heavy use.
- Sharpen when cut quality drops, and check balance before reinstalling.