Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Rapid City | 5a | May 12 | Oct 1 | 142 |
| Sioux Falls | 5a | Apr 26 | Oct 13 | 170 |
| Aberdeen | 4a | May 7 | Sep 30 | 146 |
| Brookings | 4b | May 5 | Oct 2 | 150 |
Zones in South Dakota
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. South Dakota's last-frost spread is
16 days wide. Use the location nearest you.
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