Frost dates in Walhalla, ND
The average last spring frost in Walhalla is around May 16 and the first fall frost is around September 24. That gives Walhalla 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 |