Frost dates in Eureka, MT
The average last spring frost in Eureka is around May 22 and the first fall frost is around September 17. That gives Eureka an average growing season of about 118 days.
Last spring frost
| Early (10% chance after) | May 1 |
|---|---|
| Average (50%) | May 22 |
| Late (90%) | June 9 |
First fall frost
| Early (10%) | September 2 |
|---|---|
| Average (50%) | September 17 |
| Late (90% chance before) | October 7 |