Frost dates in Bismarck, ND
The average last spring frost in Bismarck is around May 11 and the first fall frost is around October 5. That gives Bismarck an average growing season of about 147 days.
Last spring frost
| Early (10% chance after) | April 29 |
|---|---|
| Average (50%) | May 11 |
| Late (90%) | May 20 |
First fall frost
| Early (10%) | September 19 |
|---|---|
| Average (50%) | October 5 |
| Late (90% chance before) | October 14 |