Frost dates in Poweshiek County, Iowa
The average last spring frost in Poweshiek County falls Apr 24 to May 3 and the average first fall frost Oct 6 to Oct 15, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 5a to 5b. Places: Deep River, Grinnell, Guernsey, Hartwick, Holiday Lake, Malcom. 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 |
|---|---|---|---|---|
| 50112 | Grinnell | May 3 | Oct 6 | 5b |
| 50157 | Malcom | May 3 | Oct 6 | 5a |
| 50171 | Montezuma | May 3 | Oct 6 | 5b |
| 50242 | Searsboro | May 3 | Oct 6 | 5b |
| 52211 | Holiday Lake | Apr 28 | Oct 10 | 5a |
| 52221 | Guernsey | Apr 28 | Oct 10 | 5b |
| 52222 | Deep River | Apr 24 | Oct 15 | 5b |
| 52232 | Hartwick | Apr 28 | Oct 10 | 5a |
Nearby counties
Iowa County Mahaska County Keokuk County Tama County Jasper County Benton County
All Iowa counties · Download Iowa frost dates (CSV)
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