Frost dates across North Dakota
Typical last spring frost, first fall frost, and USDA zone for 7 North Dakota cities, from 30-year NOAA climate normals. Every date is a 50 percent odds line, not a promise. Pick a city for the full frost window and what is plantable there now.
Not on the list? Any North Dakota ZIP works.
| City | Last spring frost | First fall frost | Season length | Zone |
|---|---|---|---|---|
| Fargo | May 5 | Oct 3 | about 151 days | 4a |
| Bismarck | May 10 | Sep 30 | about 143 days | 4a |
| Grand Forks | May 10 | Oct 1 | about 144 days | 4a |
| Minot | May 10 | Oct 1 | about 144 days | 4a |
| Williston | May 21 | Sep 21 | about 123 days | 4a |
| Dickinson | May 18 | Sep 25 | about 130 days | 4b |
| Jamestown | May 8 | Sep 29 | about 144 days | 4b |
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