How often should I fertilize my lawn?

Cool-season grasses, including Kentucky bluegrass, perennial ryegrass, fine and tall fescue, should be fertilized right after they wake up from their winter dormancy and before the summer heat. This type of lawn should be fertilized again in the fall before winter.

Warm season grasses, also called southern grasses because that is where they are typically grown, are best fertilized in early spring and throughout mid and late summer. They will go dormant in fall so this type of grass does not need the fall fertilization like cool season grasses do.