Frost dates in Birchwood, WI
The average last spring frost in Birchwood is around June 2 and the first fall frost is around September 13. That gives Birchwood an average growing season of about 103 days.
Last spring frost
| Early (10% chance after) | May 14 |
|---|---|
| Average (50%) | June 2 |
| Late (90%) | June 24 |
First fall frost
| Early (10%) | August 18 |
|---|---|
| Average (50%) | September 13 |
| Late (90% chance before) | October 9 |