Frost dates in Northbrook, IL
The average last spring frost in Northbrook is around April 25 and the first fall frost is around October 15. That gives Northbrook an average growing season of about 173 days.
Last spring frost
| Early (10% chance after) | April 14 |
|---|---|
| Average (50%) | April 25 |
| Late (90%) | May 15 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | November 5 |