Frost dates in Knoxville, IL
The average last spring frost in Knoxville is around April 22 and the first fall frost is around October 21. That gives Knoxville an average growing season of about 182 days.
Last spring frost
| Early (10% chance after) | April 14 |
|---|---|
| Average (50%) | April 22 |
| Late (90%) | April 30 |
First fall frost
| Early (10%) | October 10 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | November 1 |