When to plant mint in North Dakota
North Dakota spans USDA zones 4a–4b, so the right time to plant mint shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 4 in Fargo to May 21 in Williston — below are local dates for 9 cities, each computed from its own frost dates.
| City | Zone | Last frost | First frost | Transplant out |
|---|---|---|---|---|
| Fargo | 4a | May 4 | October 2 | May 4 – May 18 |
| Bismarck | 4a | May 10 | September 30 | May 10 – May 24 |
| Grand Forks | 4a | May 10 | October 1 | May 10 – May 24 |
| Minot | 4a | May 10 | October 1 | May 10 – May 24 |
| West Fargo | 4a | May 4 | October 2 | May 4 – May 18 |
| Williston | 4a | May 21 | September 21 | May 21 – June 4 |
| Dickinson | 4b | May 20 | September 22 | May 20 – June 3 |
| Mandan | 4a | May 13 | September 27 | May 13 – May 27 |
Mint in North Dakota: FAQ
When can I plant mint in North Dakota?
Across North Dakota, the time to transplant mint spans roughly May 4 in Fargo to May 21 in Williston, each following that city's local frost dates.
Does the mint planting date vary across North Dakota?
Yes. North Dakota publishes 9 cities with their own frost dates, so the right mint planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
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