Illinois frost dates
Median last spring frost and first fall frost for 1,287 places in Illinois. Last frost ranges from Apr 1 in Madison to May 2 in Chadwick.
Largest cities
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Chicago | Apr 10 | Nov 5 | 209 d | 6b |
| Aurora | Apr 19 | Oct 23 | 187 d | 5b |
| Rockford | Apr 24 | Oct 17 | 176 d | 5b |
| Joliet | Apr 19 | Oct 25 | 189 d | 6a |
| Naperville | Apr 28 | Oct 16 | 171 d | 5b |
| Peoria | Apr 16 | Oct 23 | 190 d | 6a |
| Springfield | Apr 15 | Oct 22 | 190 d | 6a |
| Elgin | Apr 26 | Oct 18 | 175 d | 5b |
| Waukegan | Apr 30 | Oct 19 | 172 d | 6a |
| Champaign | Apr 15 | Oct 24 | 192 d | 6a |
| Cicero | Apr 11 | Oct 31 | 203 d | 6a |
| Bloomington | Apr 25 | Oct 16 | 174 d | 6a |
| Arlington Heights | Apr 19 | Oct 26 | 190 d | 6a |
| Evanston | Apr 26 | Oct 21 | 178 d | 6a |
| Schaumburg | Apr 30 | Oct 13 | 166 d | 5b |
| Bolingbrook | Apr 20 | Oct 22 | 185 d | 6a |
| Decatur | Apr 14 | Oct 24 | 193 d | 6a |
| Palatine | Apr 19 | Oct 26 | 190 d | 5b |
| Skokie | Apr 26 | Oct 21 | 178 d | 6a |
| Des Plaines | Apr 16 | Oct 28 | 195 d | 6a |
| Orland Park | Apr 19 | Oct 22 | 186 d | 6a |
| Tinley Park | Apr 23 | Oct 20 | 180 d | 6a |
| Oak Lawn | Apr 11 | Oct 31 | 203 d | 6a |
| Berwyn | Apr 11 | Oct 31 | 203 d | 6a |
| Mount Prospect | Apr 19 | Oct 26 | 190 d | 6a |
| Normal | Apr 25 | Oct 16 | 174 d | 6a |
| Wheaton | Apr 28 | Oct 16 | 171 d | 5b |
| Oak Park | Apr 11 | Oct 31 | 203 d | 6a |
| Hoffman Estates | Apr 30 | Oct 13 | 166 d | 5b |
| Downers Grove | Apr 28 | Oct 16 | 171 d | 5b |
| Glenview | Apr 26 | Oct 21 | 178 d | 6a |
| Elmhurst | Apr 16 | Oct 28 | 195 d | 6a |
| Lombard | Apr 28 | Oct 16 | 171 d | 6a |
| Dekalb | Apr 24 | Oct 18 | 177 d | 5b |
| Moline | Apr 24 | Oct 18 | 177 d | 5b |
| Plainfield | Apr 20 | Oct 22 | 185 d | 5b |
| Urbana | Apr 15 | Oct 24 | 192 d | 6a |
| Belleville | Apr 12 | Oct 20 | 191 d | 7a |
| Bartlett | Apr 30 | Oct 13 | 166 d | 5b |
| Buffalo Grove | Apr 19 | Oct 26 | 190 d | 6a |