Frost dates in Hillsboro, WI
The average last spring frost in Hillsboro is around May 12 and the first fall frost is around September 30. That gives Hillsboro an average growing season of about 141 days.
Last spring frost
| Early (10% chance after) | April 26 |
|---|---|
| Average (50%) | May 12 |
| Late (90%) | May 29 |
First fall frost
| Early (10%) | September 19 |
|---|---|
| Average (50%) | September 30 |
| Late (90% chance before) | October 11 |