Frost dates in St. John, ND
The average last spring frost in St. John is around May 20 and the first fall frost is around September 22. That gives St. John an average growing season of about 125 days.
Last spring frost
| Early (10% chance after) | May 8 |
|---|---|
| Average (50%) | May 20 |
| Late (90%) | June 3 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 22 |
| Late (90% chance before) | October 5 |