North Dakota · zones 4a–4a
When to plant zucchini in North Dakota.
Sow between May 22 to Sep 4 in a typical year, keyed to North Dakota's median last frost around May 15. A second, fall sowing fits Jun 8 to Jun 27. Dates below are state medians; your ZIP code shifts them by days to weeks.
The 2026 windows
Zucchini dates for a typical North Dakota season.
Direct sow
May 22 to Sep 4
Keyed to the ~May 15 last frost. Sow 1" deep, 24" apart.
Fall round
Jun 8 to Jun 27
Counted back from the ~Sep 22 first frost.
Harvest
~50 days later
~8 lb per plant over ~5 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.