Frost dates in Willow River, MN
The average last spring frost in Willow River is around May 24 and the first fall frost is around September 20. That gives Willow River an average growing season of about 119 days.
Last spring frost
| Early (10% chance after) | May 4 |
|---|---|
| Average (50%) | May 24 |
| Late (90%) | June 12 |
First fall frost
| Early (10%) | August 31 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 7 |