Frost dates in Hillsboro, IL
The average last spring frost in Hillsboro is around April 16 and the first fall frost is around October 18. That gives Hillsboro an average growing season of about 185 days.
Last spring frost
| Early (10% chance after) | April 3 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | May 2 |
First fall frost
| Early (10%) | October 4 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 1 |