Frost dates in Ennis, MT
The average last spring frost in Ennis is around June 7 and the first fall frost is around September 8. That gives Ennis an average growing season of about 93 days.
Last spring frost
| Early (10% chance after) | May 22 |
|---|---|
| Average (50%) | June 7 |
| Late (90%) | June 29 |
First fall frost
| Early (10%) | August 22 |
|---|---|
| Average (50%) | September 8 |
| Late (90% chance before) | September 21 |