Frost dates by location
| Location | Zone | Last spring frost | First fall frost | Frost-free days |
|---|---|---|---|---|
| Bismarck | 4b | May 10 | Sep 30 | 143 |
| Fargo | 4a | May 10 | Sep 30 | 143 |
| Williston | 4a | May 21 | Sep 21 | 123 |
| Grand Forks | 4a | May 11 | Sep 29 | 141 |
| Minot | 4a | May 13 | Sep 28 | 138 |
Zones in North Dakota
Bottom line: a statewide planting date is a compromise nobody's garden actually
lives at. North Dakota's last-frost spread is
11 days wide. Use the location nearest you.
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