Frost dates in Biron, WI
The average last spring frost in Biron is around May 14 and the first fall frost is around September 26. That gives Biron an average growing season of about 135 days.
Last spring frost
| Early (10% chance after) | April 28 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | May 28 |
First fall frost
| Early (10%) | September 11 |
|---|---|
| Average (50%) | September 26 |
| Late (90% chance before) | October 10 |