Frost dates in Sibley, IL
The average last spring frost in Sibley is around April 18 and the first fall frost is around October 8. That gives Sibley an average growing season of about 173 days.
Last spring frost
| Early (10% chance after) | March 31 |
|---|---|
| Average (50%) | April 18 |
| Late (90%) | May 8 |
First fall frost
| Early (10%) | September 24 |
|---|---|
| Average (50%) | October 8 |
| Late (90% chance before) | October 26 |