Frost dates in Duluth, MN
The average last spring frost in Duluth is around April 30 and the first fall frost is around October 18. That gives Duluth an average growing season of about 171 days.
Last spring frost
| Early (10% chance after) | April 21 |
|---|---|
| Average (50%) | April 30 |
| Late (90%) | May 13 |
First fall frost
| Early (10%) | September 27 |
|---|---|
| Average (50%) | October 18 |
| Late (90% chance before) | November 6 |