Frost dates in Jefferson, WI
The average last spring frost in Jefferson is around April 27 and the first fall frost is around October 17. That gives Jefferson an average growing season of about 173 days.
Last spring frost
| Early (10% chance after) | April 17 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 7 |
First fall frost
| Early (10%) | October 8 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | October 28 |