Frost dates in Columbus, MT
The average last spring frost in Columbus is around May 21 and the first fall frost is around September 19. That gives Columbus an average growing season of about 121 days.
Last spring frost
| Early (10% chance after) | May 6 |
|---|---|
| Average (50%) | May 21 |
| Late (90%) | June 8 |
First fall frost
| Early (10%) | September 5 |
|---|---|
| Average (50%) | September 19 |
| Late (90% chance before) | October 7 |