North Dakota planting calendar

When to plant kale in North Dakota — sow, transplant & harvest dates

North Dakota is mostly USDA zone 4a (range 3a-4b). Dates below are derived from kale's frost tolerance and North Dakota's frost window — not generic national averages.

Kale planting timetable for North Dakota

Stage	When in North Dakota	Anchor
Start seeds indoors	early April (April 3)	6 weeks before the last frost (mid-May)
Transplant outside	mid-April (April 17)	28 days before the last frost (mid-May)
First harvest (estimate)	mid-June (June 16)	~60 days from transplant

Dates are state-wide averages for the dominant zone. Local microclimates — elevation, urban heat, coastal moderation — can shift the window by 1-2 weeks. Use the frost-date calculator for a date tuned to your town.

Why North Dakota's climate shifts the kale dates

North Dakota's last spring frost averages mid-May and first fall frost late September, which sets the whole planting clock. North Dakota is among the coldest states, with a short season and brutal winters. Cold-hardy, fast-maturing varieties are essential. Sow early — kale bolt once daytime temperatures hold above 24 °C, so the earlier they go in, the longer the harvest.

Kale is among the hardiest brassicas, surviving temperatures as low as −12 °C (10 °F) in protected conditions; frost sweetens the leaves by converting starches to sugars. Transplant or direct-sow 4–6 weeks before last spring frost; can also be direct-sown. For fall/winter harvest, direct-sow or transplant 6–8 weeks before first autumn frost. Avoid planting when temperatures consistently exceed 27 °C (80 °F) as heat reduces palatability and increases bitterness. Harvest outer leaves continuously to extend production; the plant does not form a head and can be harvested over many months.

Frost-risk note

Don't plant before mid-May — a hard freeze can still set young plants back. In the far north near the Canadian border (zone 3a) the safe date runs a week or two later.

Regional variation within North Dakota

the far north near the Canadian border (zone 3a) runs roughly 1-2 weeks behind the state average; the southern Red River and Missouri valleys (zone 4b) can plant 1-2 weeks earlier.

Fargo — USDA zone 4a
Bismarck — USDA zone 4a
Grand Forks — USDA zone 3b
Minot — USDA zone 3b

What else to plant in North Dakota around then

The same early window suits peas, lettuce, spinach, and onion sets.

Quick-grow guide

Sun: Full sun to part shade — 4–6+ hours direct.
Soil temperature for germination: 7–29 °C (45–85 °F).
Spacing: 12–18 inches (30–45 cm) between plants.
Days to harvest: ~60 days from planting out.

Frequently asked questions

When is the best time to plant kale in North Dakota?

In North Dakota (mostly USDA zone 4a), sow kale indoors around early April, transplant outdoors mid-April (before the last frost, mid-May), and harvest from mid-June. Kale are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

What USDA zone is North Dakota?

Most of North Dakota sits in USDA hardiness zone 4a, with the state spanning roughly 3a-4b from the far north near the Canadian border (zone 3a) to the southern Red River and Missouri valleys (zone 4b). The last spring frost averages mid-May and the first fall frost late September.

Can you grow kale in North Dakota?

Yes. North Dakota's dominant zone 4a supports kale — the key is timing. Kale are cold-hardy — they tolerate frost and actively prefer cool weather, so they go in well before the last spring frost and bolt in summer heat.

Does the planting date change across North Dakota?

the far north near the Canadian border (zone 3a) runs roughly 1-2 weeks behind the state average; the southern Red River and Missouri valleys (zone 4b) can plant 1-2 weeks earlier.

What else can I plant in North Dakota around the same time?

The same early window suits peas, lettuce, spinach, and onion sets.

Source and methodology

State zone spans from the USDA Plant Hardiness Zone Map (2023); frost-date averages from NOAA Climate Data Online. Hot-state two-season timing cross-checked against the UF/IFAS Florida Gardening Calendar and the University of Arizona Cooperative Extension planting calendar. Curated by the Growli editorial team.