Frost dates in Pennington County, South Dakota
The average last spring frost in Pennington County falls May 3 to Jun 1 and the average first fall frost Sep 10 to Oct 8, depending on the ZIP code (50% odds, 32°F, NOAA 1991–2020 normals). USDA hardiness zone 4b to 5b. Places: Hill City, Keystone, Quinn, Rapid City, Wall. 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 |
|---|---|---|---|---|
| 57701 | Rapid City | May 3 | Oct 8 | 5b |
| 57702 | Rapid City | May 20 | Sep 25 | 5a |
| 57703 | Rapid City | May 12 | Oct 1 | 5a |
| 57725 | May 12 | Oct 1 | 5a | |
| 57745 | Hill City | Jun 1 | Sep 10 | 4b |
| 57751 | Keystone | May 15 | Oct 1 | 5a |
| 57775 | Quinn | May 16 | Sep 26 | 5a |
| 57780 | May 10 | Oct 1 | 5a | |
| 57790 | Wall | May 10 | Oct 1 | 5a |
Nearby counties
Meade County Custer County Lawrence County Oglala Lakota County Fall River County Butte County
All South Dakota counties · Download South Dakota frost dates (CSV)
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