Frost dates in Backus, MN
The average last spring frost in Backus is around May 14 and the first fall frost is around September 30. That gives Backus an average growing season of about 139 days.
Last spring frost
| Early (10% chance after) | April 26 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | May 24 |
First fall frost
| Early (10%) | September 19 |
|---|---|
| Average (50%) | September 30 |
| Late (90% chance before) | October 9 |