Frost dates in Lemont, IL
The average last spring frost in Lemont is around April 21 and the first fall frost is around October 19. That gives Lemont an average growing season of about 181 days.
Last spring frost
| Early (10% chance after) | April 13 |
|---|---|
| Average (50%) | April 21 |
| Late (90%) | May 8 |
First fall frost
| Early (10%) | October 13 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | December 2 |