Frost dates in Saybrook, IL
The average last spring frost in Saybrook is around April 18 and the first fall frost is around October 8. That gives Saybrook 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 |