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Apply crabgrass pre-emergent in spring, a week or two before the soil holds about 55°F for several days in a row, then water it in. That ranges from mid-February in the Florida Panhandle to mid-April through early May in places like Nebraska.
October 14, 2026
Thatch over about 1/2 inch needs managing, and core aeration often handles it. Several extension services save mechanical dethatching for about 1 inch or more: do it in early fall or spring for cool-season grass and late spring to midsummer for warm-season grass.
September 3, 2026
Fertilize cool-season grass mainly in fall (September through November), with an optional light feeding in late spring. Fertilize warm-season grass from late spring through summer, once it has fully greened up and the soil is about 65°F.
August 22, 2026
