Frost dates in St. Charles County, Missouri
The average last spring frost in St. Charles County falls Apr 4 to Apr 14 and the average first fall frost Oct 23 to Nov 5, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 6b to 7a. Places: Augusta, Defiance, Foristell, Lake St. Louis, New Melle, O'Fallon. 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 |
|---|---|---|---|---|
| 63301 | St. Charles | Apr 8 | Oct 29 | 6b |
| 63303 | St. Charles | Apr 9 | Oct 26 | 7a |
| 63304 | Weldon Spring | Apr 10 | Oct 26 | 6b |
| 63332 | Augusta | Apr 8 | Oct 25 | 6b |
| 63341 | Defiance | Apr 10 | Oct 26 | 6b |
| 63348 | Foristell | Apr 14 | Oct 23 | 6b |
| 63365 | New Melle | Apr 10 | Oct 26 | 6b |
| 63366 | O'Fallon | Apr 9 | Oct 26 | 6b |
| 63367 | Lake St. Louis | Apr 10 | Oct 26 | 6b |
| 63368 | O'Fallon | Apr 10 | Oct 26 | 6b |
| 63373 | Portage Des Sioux | Apr 5 | Oct 27 | 6b |
| 63376 | St. Peters | Apr 9 | Oct 26 | 6b |
| 63385 | Wentzville | Apr 10 | Oct 26 | 6b |
| 63386 | West Alton | Apr 4 | Nov 5 | 7a |
Nearby counties
St. Louis County Lincoln County St. Louis city Warren County Franklin County Jefferson County
All Missouri counties · Download Missouri frost dates (CSV)
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