Frost dates in Janesville, WI
The average last spring frost in Janesville is around April 28 and the first fall frost is around October 10. That gives Janesville an average growing season of about 165 days.
Last spring frost
| Early (10% chance after) | April 20 |
|---|---|
| Average (50%) | April 28 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | September 30 |
|---|---|
| Average (50%) | October 10 |
| Late (90% chance before) | October 23 |