South Dakota frost dates: B
| City | Last frost | First frost | Season | Zone |
|---|---|---|---|---|
| Badger | May 3 | Oct 2 | 152 d | 4b |
| Baltic | May 1 | Oct 4 | 156 d | 5a |
| Barnard | May 7 | Sep 29 | 145 d | 4a |
| Batesland | May 11 | Oct 2 | 144 d | 5a |
| Bath | May 9 | Sep 26 | 140 d | 4a |
| Belle Fourche | May 10 | Sep 30 | 143 d | 4b |
| Belvidere | May 12 | Sep 28 | 139 d | 5a |
| Beresford | May 2 | Oct 1 | 152 d | 5a |
| Big Stone City | May 5 | Oct 2 | 150 d | 4b |
| Bison | May 10 | Oct 1 | 144 d | 4b |
| Black Hawk | May 10 | Oct 5 | 148 d | 5a |
| Blunt | May 17 | Sep 24 | 130 d | 4b |
| Bonesteel | May 3 | Oct 10 | 160 d | 5a |
| Bowdle | May 7 | Oct 3 | 149 d | 4b |
| Box Elder | May 12 | Oct 1 | 142 d | 5a |
| Bradley | May 5 | Oct 5 | 153 d | 4b |
| Brandon | May 1 | Oct 6 | 158 d | 5a |
| Brandt | May 7 | Oct 1 | 147 d | 4b |
| Brentford | May 6 | Sep 29 | 146 d | 4a |
| Bridgewater | Apr 30 | Oct 7 | 160 d | 5a |
| Bristol | May 6 | Oct 4 | 151 d | 4b |
| Britton | May 13 | Sep 26 | 136 d | 4a |
| Brookings | May 6 | Oct 1 | 148 d | 4b |
| Bruce | May 6 | Oct 1 | 148 d | 4b |
| Bryant | May 5 | Oct 4 | 152 d | 4b |
| Buffalo | May 10 | Oct 1 | 144 d | 4b |
| Buffalo Gap | May 15 | Sep 27 | 135 d | 5a |
| Bullhead | May 9 | Sep 30 | 144 d | 4b |
| Burbank | May 3 | Oct 3 | 153 d | 5a |
| Burke | May 6 | Oct 3 | 150 d | 5a |