Frost dates in Potomac, IL
The average last spring frost in Potomac is around April 27 and the first fall frost is around October 15. That gives Potomac an average growing season of about 171 days.
Last spring frost
| Early (10% chance after) | April 11 |
|---|---|
| Average (50%) | April 27 |
| Late (90%) | May 10 |
First fall frost
| Early (10%) | October 1 |
|---|---|
| Average (50%) | October 15 |
| Late (90% chance before) | October 31 |