Pre-Emergent Timing Tool

Estimates the typical spring crabgrass and fall poa annua pre-emergent application windows by state, with soil temperature triggers for accurate timing.

Pre-Emergent Timing Tool

Pre-emergent herbicides only work if you apply them before weeds germinate. Get the typical window for your state, plus the soil temperature trigger that nails the timing every year.

Your State Sets the baseline window

Target Weed Different weeds, different timing

State estimates are baselines — local weather varies year to year. The most reliable trigger is soil temperature at 4 inches deep. Pre-emergent products vary in active ingredient and length of control; always read the label for your specific bag.

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Pre-Emergent Timing Tool

Pre-Emergent Timing Tool

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