Frost dates in Box Elder, SD
The average last spring frost in Box Elder is around May 11 and the first fall frost is around September 29. That gives Box Elder an average growing season of about 141 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 11 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 13 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 13 |