Frost dates in Polson, MT
The average last spring frost in Polson is around May 10 and the first fall frost is around September 29. That gives Polson an average growing season of about 142 days.
Last spring frost
| Early (10% chance after) | April 23 |
|---|---|
| Average (50%) | May 10 |
| Late (90%) | May 30 |
First fall frost
| Early (10%) | September 15 |
|---|---|
| Average (50%) | September 29 |
| Late (90% chance before) | October 23 |