North Dakota · zones 4a–4a
When to plant potatoes in North Dakota.
Sow between Apr 7 to May 10 in a typical year, keyed to North Dakota's median last frost around May 15. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Potatoes dates for a typical North Dakota season.
Direct sow
Apr 7 to May 10
Keyed to the ~May 15 last frost. Sow 4" deep, 12" apart.
Harvest
~90 days later
~3 lb per plant over ~1 weeks.
North Dakota spans more than one climate: Zone 4 is the most common zone, but the state runs 4a to 4a. That's why the planner works from your ZIP code's frost dates, not your zone — mountain and coastal gardens in the same state can be three weeks apart.