Frost dates in Knox, ND
The average last spring frost in Knox is around May 19 and the first fall frost is around September 16. That gives Knox an average growing season of about 120 days.
Last spring frost
| Early (10% chance after) | May 7 |
|---|---|
| Average (50%) | May 19 |
| Late (90%) | June 2 |
First fall frost
| Early (10%) | September 1 |
|---|---|
| Average (50%) | September 16 |
| Late (90% chance before) | October 2 |