Frost dates in Lena, IL
The average last spring frost in Lena is around May 1 and the first fall frost is around October 6. That gives Lena an average growing season of about 158 days.
Last spring frost
| Early (10% chance after) | April 18 |
|---|---|
| Average (50%) | May 1 |
| Late (90%) | May 16 |
First fall frost
| Early (10%) | September 23 |
|---|---|
| Average (50%) | October 6 |
| Late (90% chance before) | October 23 |