Frost dates in Prospect Heights, IL
The average last spring frost in Prospect Heights is around April 22 and the first fall frost is around October 22. That gives Prospect Heights an average growing season of about 183 days.
Last spring frost
| Early (10% chance after) | April 12 |
|---|---|
| Average (50%) | April 22 |
| Late (90%) | May 1 |
First fall frost
| Early (10%) | October 8 |
|---|---|
| Average (50%) | October 22 |
| Late (90% chance before) | November 2 |