Aeration is recommended at least once a year, preferably twice, and should be done just before or during periods when the grass should grow. The type of grass you have will help you determine the aeration frequency as some grasses require aerating more often.
For example, if you have cold-season grasses such as fescue, bluegrass, and ryegrass, it is recommended to aerate the soil during the grass’ period of growth in the spring and fall. If warm-season grasses including zoysiagrass and buffalograss make up your lawn, you can aerate the soil between late spring and the beginning of fall.
If you want to aerate in the spring, make sure you do so after you’ve mowed the lawn. There are a few important steps to take after you’ve aerated the soil in order to enhance its benefits. Watering the lawn and applying fertilizer after aeration are recommended.