Frost dates in Romeoville, IL
The average last spring frost in Romeoville is around April 21 and the first fall frost is around October 19. That gives Romeoville an average growing season of about 181 days.
Last spring frost
| Early (10% chance after) | April 9 |
|---|---|
| Average (50%) | April 21 |
| Late (90%) | May 3 |
First fall frost
| Early (10%) | October 6 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | November 2 |