Frost dates in Humboldt, IL
The average last spring frost in Humboldt is around April 16 and the first fall frost is around October 19. That gives Humboldt an average growing season of about 186 days.
Last spring frost
| Early (10% chance after) | March 31 |
|---|---|
| Average (50%) | April 16 |
| Late (90%) | May 2 |
First fall frost
| Early (10%) | October 6 |
|---|---|
| Average (50%) | October 19 |
| Late (90% chance before) | November 3 |