Frost dates in Sun Prairie, WI
The average last spring frost in Sun Prairie is around May 6 and the first fall frost is around October 4. That gives Sun Prairie an average growing season of about 151 days.
Last spring frost
| Early (10% chance after) | April 22 |
|---|---|
| Average (50%) | May 6 |
| Late (90%) | May 26 |
First fall frost
| Early (10%) | September 22 |
|---|---|
| Average (50%) | October 4 |
| Late (90% chance before) | October 19 |