Frost dates across South Dakota
Typical last spring frost, first fall frost, and USDA zone for 4 South Dakota cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Sioux Falls | Apr 26 | Oct 13 | about 170 days | 5a |
| Rapid City | May 10 | Oct 5 | about 148 days | 5b |
| Aberdeen | May 7 | Sep 29 | about 145 days | 4a |
| Brookings | May 6 | Oct 1 | about 148 days | 4b |
Row & Bed is a plant reference built around your garden: your zone, your frost dates, your forecast, and a cited page for every variety in your beds.
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