Frost dates in River Falls, WI
The average last spring frost in River Falls is around May 12 and the first fall frost is around September 28. That gives River Falls an average growing season of about 139 days.
Last spring frost
| Early (10% chance after) | April 25 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 23 |
First fall frost
| Early (10%) | September 16 |
|---|---|
| Average (50%) | September 28 |
| Late (90% chance before) | October 12 |