Lawn Mowing Height Guide: How Short Should You Cut?
One of the most common lawn care mistakes is cutting grass too short. It might look tidy for a day, but scalping your lawn weakens the root system, encourages weeds, and makes it more vulnerable to heat and drought.
The One-Third Rule
Never remove more than one-third of the grass blade in a single mowing. If your target height is 3 inches, mow when it reaches about 4.5 inches. This keeps the grass healthy and reduces shock.
Recommended Heights by Grass Type
| Grass Type | Ideal Height | Season |
|---|---|---|
| Kentucky Bluegrass | 2.5 - 3.5" | Cool |
| Tall Fescue | 3 - 4" | Cool |
| Perennial Ryegrass | 2 - 3" | Cool |
| Bermuda | 1 - 2" | Warm |
| St. Augustine | 2.5 - 4" | Warm |
| Zoysia | 1 - 2.5" | Warm |
| Centipede | 1.5 - 2.5" | Warm |
Seasonal Adjustments
In summer heat, raise your mowing height by half an inch. Taller grass shades the soil, retains moisture, and keeps roots cooler. In fall, gradually lower the height for the last few mows to reduce matting under snow.
Sharp Blades Matter
Dull mower blades tear grass instead of cutting it cleanly, leaving ragged brown tips. Sharpen your blades at least twice per mowing season or after every 20-25 hours of use.