Frost dates in Winneshiek County, Iowa
The average last spring frost in Winneshiek County falls May 1 to May 8 and the average first fall frost Oct 1 to Oct 7, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4b to 5a. Places: Calmar, Castalia, Decorah, Fort Atkinson, Ossian, Ridgeway. 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 |
|---|---|---|---|---|
| 52101 | Decorah | May 3 | Oct 7 | 5a |
| 52132 | Calmar | May 3 | Oct 7 | 5a |
| 52133 | Castalia | May 1 | Oct 3 | 5a |
| 52144 | Fort Atkinson | May 3 | Oct 7 | 5a |
| 52161 | Ossian | May 1 | Oct 3 | 5a |
| 52165 | Ridgeway | May 8 | Oct 1 | 4b |
| 52168 | Spillville | May 3 | Oct 7 | 4b |
Nearby counties
Fayette County Allamakee County Howard County Chickasaw County Clayton County Bremer County
All Iowa counties · Download Iowa frost dates (CSV)
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