Frost dates in Mountain, ND
The average last spring frost in Mountain is around May 16 and the first fall frost is around September 24. That gives Mountain an average growing season of about 131 days.
Last spring frost
| Early (10% chance after) | May 2 |
|---|---|
| Average (50%) | May 16 |
| Late (90%) | June 1 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 24 |
| Late (90% chance before) | October 9 |