South Dakota planting zones & frost dates
USDA hardiness zones in South Dakota go from 4a to 5b. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.
| City | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|
| Aberdeen | 4a | May 8 | Sep 29 |
| Brookings | 4b | May 6 | Oct 1 |
| Huron | 4b | May 6 | Oct 2 |
| Mitchell | 5a | May 2 | Oct 6 |
| Rapid City | 5b | May 3 | Oct 8 |
| Sioux Falls | 5a | May 1 | Oct 6 |
| Spearfish | 5b | May 12 | Oct 2 |
| Vermillion | 5a | May 3 | Oct 3 |
| Watertown | 4b | May 7 | Sep 30 |
| Yankton | 5a | Apr 27 | Oct 11 |
Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.