Frost dates in Garrison, ND
The average last spring frost in Garrison is around May 15 and the first fall frost is around September 21. That gives Garrison an average growing season of about 129 days.
Last spring frost
| Early (10% chance after) | May 2 |
|---|---|
| Average (50%) | May 15 |
| Late (90%) | May 28 |
First fall frost
| Early (10%) | September 8 |
|---|---|
| Average (50%) | September 21 |
| Late (90% chance before) | October 7 |