Crabgrass Germination Map 2025. Below are several previous purdue turf tips that answer the most commonly asked questions about crabgrass control. Seeds germinate best from early spring to late summer.

Research shows that crabgrass begins to germinate when the average daily soil temperatures reach 57 to 64 ⁰f large quantities of crabgrass will not start germinating until soil temperatures. When to apply crabgrass preventer.