Frost dates in Winter, WI
The average last spring frost in Winter is around June 1 and the first fall frost is around September 15. That gives Winter an average growing season of about 106 days.
Last spring frost
| Early (10% chance after) | May 14 |
|---|---|
| Average (50%) | June 1 |
| Late (90%) | June 18 |
First fall frost
| Early (10%) | August 24 |
|---|---|
| Average (50%) | September 15 |
| Late (90% chance before) | September 30 |