Frost dates in Smithboro, IL
The average last spring frost in Smithboro is around April 15 and the first fall frost is around October 25. That gives Smithboro an average growing season of about 193 days.
Last spring frost
| Early (10% chance after) | April 3 |
|---|---|
| Average (50%) | April 15 |
| Late (90%) | April 27 |
First fall frost
| Early (10%) | October 8 |
|---|---|
| Average (50%) | October 25 |
| Late (90% chance before) | November 6 |