Frost dates in Humboldt, MN
The average last spring frost in Humboldt is around May 22 and the first fall frost is around September 20. That gives Humboldt an average growing season of about 121 days.
Last spring frost
| Early (10% chance after) | May 7 |
|---|---|
| Average (50%) | May 22 |
| Late (90%) | June 8 |
First fall frost
| Early (10%) | September 2 |
|---|---|
| Average (50%) | September 20 |
| Late (90% chance before) | October 5 |