Is any crabgrass emerged in your area? If so how big or how far along? Here the first crabgrass became visible about 10 days ago on a lawn neighbor's neglected lawn that had a serious crab problem last year. Growing degree days (base 32) of 700. The crabgrass is still small--two leaves spreading to about a half inch wide. Air temps here are about 65 to 70 this week.