Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Chicago | 6a | Apr 16 | Oct 28 | 195 |
| Aurora | 5b | Apr 23 | Oct 20 | 180 |
| Rockford | 5b | Apr 27 | Oct 13 | 169 |
| Joliet | 5b | Apr 23 | Oct 20 | 180 |
| Naperville | 5b | Apr 23 | Oct 20 | 180 |
| Peoria | 5b | Apr 20 | Oct 19 | 182 |
| Springfield | 6a | Apr 14 | Oct 21 | 190 |
| North Peoria | 5b | Apr 20 | Oct 19 | 182 |
| Elgin | 5b | Apr 27 | Oct 18 | 174 |
| Waukegan | 6a | Apr 24 | Oct 23 | 182 |
| West Town | 6a | Apr 17 | Oct 26 | 192 |
| Champaign | 6a | Apr 20 | Oct 18 | 181 |
| Near North Side | 6a | Apr 17 | Oct 26 | 192 |
| Cicero | 6a | Apr 17 | Oct 26 | 192 |
Zones in Illinois
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. Illinois's last-frost spread is
13 days wide. Use the location nearest you.
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