North Dakota planting zones & frost dates
USDA hardiness zones in North Dakota go from 4a to 4b. Pick your city for its average frost dates and a planting calendar, or search by ZIP code.
| City | Zone | Avg. last frost | Avg. first frost |
|---|---|---|---|
| Bismarck | 4a | May 10 | Sep 30 |
| Dickinson | 4a | May 20 | Sep 22 |
| Fargo | 4a | May 5 | Oct 3 |
| Grand Forks | 4a | May 10 | Oct 1 |
| Jamestown | 4b | May 8 | Sep 29 |
| Mandan | 4a | May 13 | Sep 27 |
| Minot | 4a | May 10 | Oct 1 |
| West Fargo | 4a | May 10 | Sep 30 |
| Williston | 4a | May 21 | Sep 21 |
Cities with 10,000+ residents. Data: USDA Plant Hardiness Zone Map 2023 and NOAA Climate Normals 1991–2020. Sources and method.