Chicago, IL Frost Dates
The last spring frost in Chicago usually comes around April 11 and the first fall frost around October 31.
| Spring (last) | Fall (first) | |
|---|---|---|
| Frost, 32°F | April 11 | October 31 |
| Hard freeze, 28°F | April 1 | November 11 |
Growing season: about 201 days.
Frequently asked questions
When is the last frost in Chicago, IL?
The median date of the last spring frost (32°F) is April 11. In half of years the last frost comes earlier and in half it comes later, so waiting a week or two past April 11 lowers the risk for tender plants.
When is the first frost in Chicago?
The median date of the first fall frost (32°F) is October 31, and a hard freeze (28°F) usually follows around November 11.
How long is the growing season in Chicago?
About 201 days between the median last spring frost and first fall frost.
NOAA NCEI U.S. Climate Normals 1991-2020, station USW00014819. Median (50% probability) dates. Low spots and valleys can frost later in spring and earlier in fall than the station.