Frost dates across Illinois
Typical last spring frost, first fall frost, and USDA zone for 15 Illinois cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any Illinois ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Chicago | Apr 10 | Nov 5 | about 209 days | 6a |
| Aurora | Apr 19 | Oct 23 | about 187 days | 5b |
| Joliet | Apr 19 | Oct 25 | about 189 days | 6a |
| Naperville | Apr 28 | Oct 16 | about 171 days | 5b |
| Rockford | Apr 24 | Oct 17 | about 176 days | 5b |
| Springfield | Apr 15 | Oct 22 | about 190 days | 6a |
| Peoria | Apr 16 | Oct 23 | about 190 days | 6a |
| Champaign | Apr 15 | Oct 24 | about 192 days | 6a |
| Moline | Apr 24 | Oct 18 | about 177 days | 5b |
| Belleville | Apr 12 | Oct 20 | about 191 days | 7a |
| Quincy | Apr 8 | Oct 30 | about 205 days | 6a |
| Carbondale | Apr 9 | Oct 22 | about 196 days | 7a |
| Macomb | Apr 17 | Oct 22 | about 188 days | 6a |
| Effingham | Apr 13 | Oct 24 | about 194 days | 6b |
| Pontiac | Apr 16 | Oct 24 | about 191 days | 6a |
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