One of the most common lawn care mistakes is mowing too short. Each grass type has an ideal cutting height that promotes deep roots, thick growth, and natural weed resistance.
Cool-Season Grasses
These grasses thrive in northern climates with cold winters and moderate summers.
- Kentucky Bluegrass: 2.5 - 3.5 inches
- Tall Fescue: 3 - 4 inches
- Perennial Ryegrass: 2.5 - 3.5 inches
- Fine Fescue: 2.5 - 3.5 inches
Warm-Season Grasses
Common in southern regions with hot summers and mild winters.
- Bermuda Grass: 1 - 2 inches
- Zoysia Grass: 1.5 - 2.5 inches
- St. Augustine: 2.5 - 4 inches
- Centipede Grass: 1.5 - 2.5 inches
The One-Third Rule
Never cut more than one-third of the grass blade height in a single mowing. Cutting too much at once stresses the plant and weakens the root system.
For example, if your target height is 3 inches, mow when the grass reaches about 4.5 inches.
Why Taller is Better
Taller grass:
- Shades the soil, reducing water evaporation
- Naturally suppresses weeds by blocking sunlight
- Develops deeper root systems
- Is more resilient to drought and heat stress
Seasonal Adjustments
- Spring: Start slightly lower, then raise to normal height
- Summer: Mow at the higher end of the recommended range
- Fall: Gradually lower as growth slows
- Last mow: Cut slightly shorter to prevent snow mold
Not sure what grass type you have? Contact us and we’ll help you identify your lawn and set the perfect mowing height.