When to Plant Cabbage in North Dakota
Published: April 24, 2026
North Dakota gardeners in Zone 4b have a 21-week frost-free window for cabbage (May 7 to October 1). Cool-season crops like cabbage do well here because the short, cool summers match the plant's temperature preferences naturally. This guide gives exact dates for North Dakota based on your local frost calendar.
Cabbage Planting Dates for North Dakota
| Start seeds indoors | March 19–26 |
| Last frost (average) | May 7 |
| Transplant outdoors | April 16–26 |
| Expect first harvest | June 15 – July 25 |
| Fall crop start | July 9–19 |
| Fall harvest | September 7 |
| First fall frost (average) | October 1 |
⚠ Start cabbage indoors 6–8 weeks before last frost. Transplant 2–4 weeks before last frost. Very frost tolerant — withstands temperatures as low as 20°F. Also plant in late summer for fall harvest.
Growing Cabbage in North Dakota's Climate
North Dakota's cold Zone 4b climate is close to ideal for cabbage. The cool springs and moderate summers match the plant's natural temperature preferences, producing crisp, sweet, slow-bolting harvests that hot-climate gardeners cannot grow.
The fall cabbage crop in North Dakota is often better than the spring crop. Plants mature as temperatures cool in September and October, concentrating sugars and tightening heads or roots. Light frost can improve flavor; hard frost signals harvest time.
Common cabbage pests to watch for in North Dakota include Cabbage Worm and Cabbage Looper. The first line of defense is companion planting: Onion and Dill planted nearby discourage several of these pests by confusing host-plant identification or repelling adults before they can lay eggs. Weekly garden walks in the early morning catch problems when they're still manageable.
Cabbage Garden Calendar for North Dakota
| Month | Task | Notes |
|---|---|---|
| January | — | Dormant season |
| February | — | Dormant season |
| March | Start seeds indoors | Use grow lights; warm soil to 70–75°F for best germination |
| April | Transplant outdoors | Soil temp must be 45°F+; nighttime lows above 50°F |
| May ← | Harden off seedlings | Set seedlings outdoors 1–2 hours daily, increasing gradually |
| June | First harvest window opens | Cabbage begins producing 60–100 days after transplant |
| July | Fall crop planting | Transplant or direct sow for fall harvest before frost |
| August | — | Dormant season |
| September | — | Dormant season |
| October | First frost approaches | Harvest remaining cabbage; cover plants on frost nights |
| November | — | Dormant season |
| December | — | Dormant season |
Cabbage Growing Tips for North Dakota Gardeners
- •Space plants 18 inches apart — crowding reduces head size and promotes fungal disease.
- •Side-dress with nitrogen 3–4 weeks after transplanting to support rapid leaf formation.
- •North Dakota's short growing season means start seeds indoors under grow lights — don't rely on windowsill light which produces leggy, weak seedlings that struggle outdoors.
- •Cover young transplants with floating row covers for the first 2–3 weeks outside. The 3–5°F of protection reduces frost damage risk and accelerates early growth.
- •Harvest when heads feel firm; leave the root ball in the ground and small secondary heads may form.
Companion Planting for Cabbage in North Dakota
In North Dakota's cold climate, planting cabbage with Onion and Dill helps deter pests and improve soil. Avoid planting near Tomato and Strawberry, which inhibit cabbage growth through root chemistry or shared pest pressure. See the full cabbage companion planting guide for the complete list.
Cabbage Planting Dates by City in North Dakota
Top cities in North Dakota — select for city-level frost dates and planting calendars.
Frequently Asked Questions
When should I plant cabbage in North Dakota?
In North Dakota (Zone 4b), start cabbage seeds indoors around March 19–26 and transplant outdoors around April 16–26 — 3 weeks before the state's average last frost of May 7.
What is the last frost date in North Dakota?
North Dakota's average last frost date is May 7 in the state's most common Zone 4b. Frost dates vary by city — higher elevations and northern counties run 1 to 3 weeks later than the state average. See the city list below for city-level frost dates.
Can I grow cabbage year-round in North Dakota?
cabbage is a cool-season crop in North Dakota, with spring and fall windows. Summer heat bolts the plants before they can produce a harvestable crop. Succession planting every 2–3 weeks stretches the harvest window.
What cabbage varieties grow best in North Dakota?
For North Dakota's Zone 4b, consult a local nursery or extension office for cabbage variety recommendations.
When do I start cabbage seeds indoors in North Dakota?
Start cabbage seeds indoors in North Dakota around March 19–26, which is 7 weeks before the state's average last frost of May 7. Use grow lights and keep soil temperatures at 70–75°F for fastest germination.