Frost dates in Fort Benton, MT
The average last spring frost in Fort Benton is around May 16 and the first fall frost is around September 18. That gives Fort Benton an average growing season of about 125 days.
Last spring frost
| Early (10% chance after) | April 28 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | May 31 |
First fall frost
| Early (10%) | September 7 |
|---|---|
| Average (50%) | September 18 |
| Late (90% chance before) | October 10 |