Frost dates in McCook, IL
The average last spring frost in McCook is around April 10 and the first fall frost is around October 31. That gives McCook an average growing season of about 204 days.
Last spring frost
| Early (10% chance after) | March 29 |
|---|---|
| Average (50%) | April 10 |
| Late (90%) | April 20 |
First fall frost
| Early (10%) | October 10 |
|---|---|
| Average (50%) | October 31 |
| Late (90% chance before) | November 13 |