Frost dates in Lerna, IL
The average last spring frost in Lerna is around April 18 and the first fall frost is around October 17. That gives Lerna an average growing season of about 182 days.
Last spring frost
| Early (10% chance after) | April 5 |
|---|---|
| Average (50%) | April 18 |
| Late (90%) | June 22 |
First fall frost
| Early (10%) | August 22 |
|---|---|
| Average (50%) | October 17 |
| Late (90% chance before) | November 1 |