Frost dates in Tonica, IL
The average last spring frost in Tonica is around April 16 and the first fall frost is around October 15. That gives Tonica an average growing season of about 182 days.
Last spring frost
| Early (10% chance after) | February 18 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | April 30 |
First fall frost
| Early (10%) | October 6 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 24 |