At what height should I mow the lawn?
The mowing height of grass will change during the year. In early spring, grass may be kept shorter than when it gets very warm. A good rule is 2.5 inches from spring through mid-June. From mid-June to the end of August, 3 inches is recommended. After the first of September, take the height down by half an inch every two weeks until you have it at 1.5 inches going into winter.

Never cut off more than a third of the grass blade at mowing. Mowing the grass too short exposes the shaded lower stems to sunlight which causes them to burn and turn brown. If your mow your lawn higher it will use less water, look better and stay green longer.

Mowing at the right height and on the proper schedule helps maintain a dense, smooth, uniform turf and reduces the competitiveness of many weeds. Different grasses have different heights at which they grow best. Follow these guidelines for proper mowing:

Suggested Mowing Heights:
Bahiagrass: 2 to 3 inches
Bentgrass: 3/8 to 3/4 inches
Bermudagrass: 1/2 to 1 1/2 inches
Bluegrass/Fescue Mix: 1 1/2 to 2 1/2 inches
Blugrass/Ryegrass mix: 1 to 2 inches
Carpetgrass: 1 to 2 inches
Centipedegrass: 1 to 2 inches
Fine Fescue Grass: 1 to 2 1/2 inches
Kentucky Bluegrass: 1 to 2 1/2 inches
Perennial Ryegrass: 1 to 2 inches
St Augustine: 1 1/2 to 3 inches
Tall Fescue: 3 to 4 inches
Zoysia: 1/2 to 1 1/2 inches