Frost dates in O'Brien County, Iowa
The average last spring frost in O'Brien County falls Apr 29 to May 1 and the average first fall frost Oct 7 to Oct 10, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 5a. Places: Archer, Calumet, Granville, Hartley, Paullina, Primghar. 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 |
|---|---|---|---|---|
| 51009 | Calumet | Apr 29 | Oct 10 | 5a |
| 51022 | Granville | Apr 29 | Oct 10 | 5a |
| 51046 | Paullina | Apr 29 | Oct 10 | 5a |
| 51058 | Sutherland | Apr 29 | Oct 10 | 5a |
| 51231 | Archer | Apr 29 | Oct 10 | 5a |
| 51245 | Primghar | Apr 29 | Oct 10 | 5a |
| 51248 | Sanborn | May 1 | Oct 7 | 5a |
| 51346 | Hartley | May 1 | Oct 7 | 5a |
Nearby counties
Cherokee County Osceola County Clay County Sioux County Buena Vista County Dickinson County
All Iowa counties · Download Iowa frost dates (CSV)
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