The best time to apply pre-emergent is when your soil temperatures are between 55-70 degrees F.
When soil temperatures reach 55 degrees coming into spring, that is when the crabgrass germinating window opens.
70 degrees is the pinnacle degree at which crabgrass can germinate, thus closing the window for a pre-emergent application.
In the Yard Mastery App, the next application card pre-emergent logic is based upon these soil temperature milestones.
Please review this video here where this is discussed more in-depth.
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Keywords: preemergent, pre-emergent, prodiamine, dithiopyr, emergent