Frost dates in Mount Prospect, IL
The average last spring frost in Mount Prospect is around April 22 and the first fall frost is around October 22. That gives Mount Prospect 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 |