Frost dates in Belle Fourche, SD
The average last spring frost in Belle Fourche is around May 14 and the first fall frost is around September 21. That gives Belle Fourche an average growing season of about 130 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | June 1 |
First fall frost
| Early (10%) | September 9 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 8 |