Frost dates in Monmouth, IL
The average last spring frost in Monmouth is around April 24 and the first fall frost is around October 12. That gives Monmouth an average growing season of about 171 days.
Last spring frost
| Early (10% chance after) | April 10 |
|---|---|
| Average (50%) | April 24 |
| Late (90%) | May 9 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 12 |
| Late (90% chance before) | October 29 |