Frost dates in Williamson County, Illinois
The average last spring frost in Williamson County falls Apr 4 to Apr 14 and the average first fall frost Oct 21 to Oct 28, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 7a. Places: Cambria, Carterville, Colp, Creal Springs, Energy, Freeman Spur. Pick a ZIP for 10% and 90% odds, soil temperature and the 7-day freeze forecast.
| ZIP | Place | Last spring frost | First fall frost | Zone |
|---|---|---|---|---|
| 62841 | Freeman Spur | Apr 4 | Oct 28 | 7a |
| 62902 | Apr 9 | Oct 22 | 7a | |
| 62915 | Cambria | Apr 9 | Oct 22 | 7a |
| 62918 | Carterville | Apr 9 | Oct 22 | 7a |
| 62921 | Colp | Apr 9 | Oct 22 | 7a |
| 62922 | Creal Springs | Apr 14 | Oct 21 | 7a |
| 62933 | Energy | Apr 9 | Oct 22 | 7a |
| 62948 | Herrin | Apr 9 | Oct 22 | 7a |
| 62949 | Hurst | Apr 9 | Oct 22 | 7a |
| 62951 | Johnston City | Apr 4 | Oct 28 | 7a |
| 62959 | Marion | Apr 9 | Oct 22 | 7a |
| 62974 | Pittsburg | Apr 7 | Oct 26 | 7a |
Nearby counties
Franklin County Jackson County Johnson County Saline County Union County Pope County
All Illinois counties · Download Illinois frost dates (CSV)
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