When to plant sweet potato in North Dakota
North Dakota spans USDA zones 4a–4b, so the right time to plant sweet potato shifts by weeks across the state. The window to transplant seedlings outdoors runs from about May 25 in Fargo to June 11 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 25 – June 8 |
| Bismarck | 4a | May 10 | September 30 | May 31 – June 14 |
| Grand Forks | 4a | May 10 | October 1 | May 31 – June 14 |
| Minot | 4a | May 10 | October 1 | May 31 – June 14 |
| West Fargo | 4a | May 4 | October 2 | May 25 – June 8 |
| Williston | 4a | May 21 | September 21 | June 11 – June 25 |
| Dickinson | 4b | May 20 | September 22 | June 10 – June 24 |
| Mandan | 4a | May 13 | September 27 | June 3 – June 17 |
Sweet Potato in North Dakota: FAQ
When can I plant sweet potato in North Dakota?
Across North Dakota, the time to transplant sweet potato spans roughly May 25 in Fargo to June 11 in Williston, each following that city's local frost dates.
Does the sweet potato planting date vary across North Dakota?
Yes. North Dakota publishes 9 cities with their own frost dates, so the right sweet potato planting window shifts by weeks between the warmest and coldest parts of the state — use your city's page for the exact dates.
How long does sweet potato take to grow in North Dakota?
Sweet Potato takes about 90–120 days to reach harvest once planted — check that this fits inside your city's frost-free season on its place page.
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