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Frost dates and growing zones in Illinois
Towns covered so far in Illinois fall in USDA zones 5b, 6a, 7a. Median dates mean frost comes later (spring) or earlier (fall) in half of years.
Towns
| Town | Zone | Median last frost | Median first frost |
|---|---|---|---|
| Chicago | 6a | Apr 10 | Nov 1 |
| Naperville | 5b | Apr 19 | Oct 23 |
| Rockford | 5b | Apr 24 | Oct 17 |
| Springfield | 6a | Apr 14 | Oct 20 |
| Peoria | 6a | Apr 16 | Oct 23 |
| Champaign | 6a | Apr 15 | Oct 24 |
| Decatur | 6a | Apr 14 | Oct 24 |
| Belleville | 7a | Apr 12 | Oct 20 |