Frost dates in Bison, SD
The average last spring frost in Bison is around May 13 and the first fall frost is around September 26. That gives Bison an average growing season of about 136 days.
Last spring frost
| Early (10% chance after) | April 30 |
|---|---|
| Average (50%) | May 13 |
| Late (90%) | May 28 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | September 26 |
| Late (90% chance before) | October 14 |