When to plant potatoes in North Dakota
North Dakota’s average last spring frost is May 15, and the first fall frost typically arrives around September 20 — about 128 frost-free days (USDA zones 3a, 3b, 4a, 4b). Potato needs 70–120 days to mature, which fits comfortably within North Dakota's growing season.
When to plant potatoes in North Dakota: the short answer
For a spring planting, sow Apr 26 – May 15. Seeds germinate in soil from 45 to 80°F.
Windows are ~1–2 week bands around each date. Frost dates are a statewide average from NOAA/NCEI normals; your town may differ by two weeks or more. Calendar year 2026.
How to grow potatoes in North Dakota, step by step
- Prepare the bed. They need at least six to eight hours of direct sun a day and loose soil at least 18 inches deep, with a pH between 4.8 and 6.5. Dig in compost before planting.
- Sow outdoors (Apr 26 – May 15). Space plants about 12 inches apart in rows 32 inches apart, sowing seed 4 inches deep. It tolerates a light frost but not a hard freeze. As a cool-season crop it does best before summer heat arrives in North Dakota.
- Water and feed. Give it steady, even moisture, about an inch of water a week from rain or the hose.
- Watch for pests and problems. Pests: Colorado potato beetle, flea beetle, wireworm, aphids. Diseases and disorders: late blight, early blight, common scab, blackleg.
- Harvest (from about Jul 10 – Aug 29). Potato takes 70-120 days to reach harvest. Plant certified seed potatoes, not grocery-store ones. Hill soil or mulch over the stems as they grow to stop greening. New potatoes ~10 weeks in; storage potatoes after the tops die back.
Figures come from our crop data; dates use North Dakota’s average frost dates. More in the full potato growing guide.
Potato planting dates by USDA zone in North Dakota
North Dakota spans USDA zones 3a, 3b, 4a, 4b. Colder zones, usually higher or further inland, have a later last spring frost and an earlier first fall frost than the state average, so the potato dates shift with them.
When to plant potatoes in nearby states
| State | Last frost | Sow |
|---|---|---|
| North Dakota (this page) | May 15 | Apr 26 – May 15 |
| South Dakota | May 10 | Apr 21 – May 10 |
| Nebraska | April 30 | Apr 11 – Apr 30 |
| Kansas | April 15 | Mar 27 – Apr 15 |
| Oklahoma | April 1 | Mar 13 – Apr 1 |
Questions gardeners in North Dakota ask
When is the best time to plant potatoes in North Dakota?
Sow potatoes in North Dakota between April 26 and May 15. That timing is set by North Dakota's average last spring frost of May 15.
When will potatoes planted in North Dakota be ready to harvest?
Planted on time, potatoes are usually ready from about July 10 to August 29, 70-120 days after sowing.
When is the last frost in North Dakota?
On average around May 15, with the first fall frost around September 20 - about 128 frost-free days. Your town may differ by two weeks or more.