Frost dates in Cave-In-Rock, IL
The average last spring frost in Cave-In-Rock is around April 17 and the first fall frost is around October 21. That gives Cave-In-Rock an average growing season of about 187 days.
Last spring frost
| Early (10% chance after) | March 31 |
|---|---|
| Average (50%) | April 17 |
| Late (90%) | May 6 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 21 |
| Late (90% chance before) | November 4 |