Frost dates in Dewey County, South Dakota
The average last spring frost in Dewey County falls May 5 to May 10 and the average first fall frost Sep 30 to Oct 7, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4b. Places: La Plant, Lantry, Mobridge, North Eagle Butte, Timber Lake, Whitehorse. 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 |
|---|---|---|---|---|
| 57601 | Mobridge | May 5 | Oct 4 | 4b |
| 57625 | North Eagle Butte | May 6 | Oct 7 | 4b |
| 57630 | May 10 | Sep 30 | 4b | |
| 57636 | Lantry | May 8 | Oct 1 | 4b |
| 57652 | La Plant | May 10 | Sep 30 | 4b |
| 57656 | Timber Lake | May 10 | Sep 30 | 4b |
| 57661 | Whitehorse | May 10 | Sep 30 | 4b |
Nearby counties
Corson County Ziebach County Walworth County Sully County Stanley County Potter County
All South Dakota counties · Download South Dakota frost dates (CSV)
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