Frost dates in Kalispell, MT
The average last spring frost in Kalispell is around May 23 and the first fall frost is around September 17. That gives Kalispell an average growing season of about 117 days.
Last spring frost
| Early (10% chance after) | May 4 |
|---|---|
| Average (50%) | May 23 |
| Late (90%) | June 20 |
First fall frost
| Early (10%) | August 31 |
|---|---|
| Average (50%) | September 17 |
| Late (90% chance before) | October 1 |