When is it too late to seed your lawn in Chicago?
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Illustration: Shoshana Gordon/Axios
Chicagoans hoping to repair their lawns after a hot summer are running out of time.
Why it matters: Late summer and early fall are the best times to reseed lawns in northern Illinois, giving new grass enough time to establish before winter.
The big picture: Plant too late and grass might not establish before winter; too early and young grass could still be exposed to stressful summer heat.
State of play: Illinois Extension generally recommends seeding between Aug. 15 and Sept. 15, though the ideal window usually comes a little earlier in northern Illinois.
Yes, but: Chicago just experienced its hottest first four days of September on record, delaying the arrival of normal fall growing conditions.
Between the lines: The weather right now looks excellent for germination: temperatures are dropping mostly into the 70s over the coming week, nighttime temperatures remain well above freezing and there's plenty of moisture in the forecast.
- Seedlings need roughly 30 frost-free days to become established enough to handle a freeze.
Context: State borders aren't climate borders. Temperature, elevation and grass type can all shift the ideal seeding window.
The fine print: Axios reviewed university-based public services that provide agricultural and gardening guidance for each state.
The bottom line: Chicago's traditional seeding window may be closing, but this week's cooler, wetter weather could offer procrastinating lawn owners one last shot.