Frost dates in Cortland, IL
The average last spring frost in Cortland is around April 27 and the first fall frost is around October 13. That gives Cortland an average growing season of about 169 days.
Last spring frost
| Early (10% chance after) | April 13 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 12 |
First fall frost
| Early (10%) | October 2 |
|---|---|
| Average (50%) | October 13 |
| Late (90% chance before) | October 30 |