Frost dates in Blackduck, MN
The average last spring frost in Blackduck is around May 20 and the first fall frost is around September 21. That gives Blackduck an average growing season of about 124 days.
Last spring frost
| Early (10% chance after) | May 10 |
|---|---|
| Average (50%) | May 20 |
| Late (90%) | June 2 |
First fall frost
| Early (10%) | September 3 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 9 |