Data: Axios analysis of state Cooperative Extension recommendations; Map: Brad Jennings/Axios
It's prime time in Michigan to plant grass seed for patching bare spots or overseeding lawns.
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: In the Mitten State, the optimal fall seeding window closes about mid-September, according to Axios' analysis of each state's Cooperative Extension guidance.
Between the lines: The calendar follows the grass type.
The farther north you go, the earlier the window closes as that first frost approaches.