Frost dates in Mandan, ND
The average last spring frost in Mandan is around May 14 and the first fall frost is around September 23. That gives Mandan an average growing season of about 132 days.
Last spring frost
| Early (10% chance after) | May 2 |
|---|---|
| Average (50%) | May 14 |
| Late (90%) | May 27 |
First fall frost
| Early (10%) | September 10 |
|---|---|
| Average (50%) | September 23 |
| Late (90% chance before) | October 7 |