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It's prime time to plant grass seed for patching bare spots or overseeding lawns in most U.S. regions.
Why it matters: Plant too late and grass might not establish before winter; too early and young grass could still be exposed to stressful summer heat.
Zoom in: Across much of the northern U.S., the optimal fall seeding window closes about mid-September, according to Axios' analysis of each state's Cooperative Extension guidance.
