When to Plant Cabbage in New Brunswick
Published: April 24, 2026 · Updated: April 27, 2026
Extremely cold-hardy brassica — survives temperatures as low as -7°C (20°F). Start indoors 6–8 weeks before last frost, transplant 2–4 weeks before last frost, and also plant for fall harvest.
Cabbage grow well in this province with appropriate variety selection and standard Canadian planting timing.
Cabbage Planting Window for New Brunswick
Start seeds indoors: March 22–29 (varies by city — earliest in southern Ontario, latest on the Prairies)
Transplant outdoors: April 19–29 (after last frost in your city)
Minimum soil temperature: 7°C (45°F)
Days to harvest: 60–100 days
Sun requirement: Full sun (6+ hours)
Fall crop planting: July 20–30
⚠ 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.
New Brunswick Cities — Cabbage Planting Dates
City-specific frost dates and cabbage planting windows for New Brunswick.
Growing Cabbage in New Brunswick
- 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.
- Harvest when heads feel firm; leave the root ball in the ground and small secondary heads may form.
- Fall cabbage sweetens after light frost — one of the best-tasting garden crops when harvested in October.
Companion Planting for Cabbage
In New Brunswick gardens, pair cabbage with Onion, Dill, Celery, Beet. Avoid planting near Tomato, Strawberry, Pepper, which compete with or inhibit cabbage growth.
Common Pests and Problems
Cabbage in New Brunswick are commonly affected by Cabbage Worm, Cabbage Looper, Aphid, Flea Beetle. Floating row covers installed at planting block most adult pests from laying eggs, and a weekly scouting routine catches infestations before they damage the crop.
Frequently Asked Questions
When should I plant cabbage in New Brunswick?
In New Brunswick (Canadian Zone 5b), start seeds indoors around March 22 and transplant around April 19. Cabbage grow well in this province with appropriate variety selection and standard Canadian planting timing.
What is the best cabbage variety for New Brunswick?
New Brunswick gardeners should prioritise varieties bred for shorter seasons or Canadian climates. For cabbage in Canadian Zone 5b, look for cultivars labelled under 100 days to maturity. Local nurseries and provincial seed exchanges curate varieties that ripen within Canadian frost-free windows.
How does New Brunswick's climate affect cabbage?
New Brunswick spans Canadian Zone 5b with frost-free seasons ranging from roughly 151 to 155 days. Cabbage actually prefer the cooler spring and fall windows typical of New Brunswick, making them one of the most reliable crops in the province.
Can I grow cabbage in containers in New Brunswick?
Yes. Container growing on balconies and patios extends the viable growing area across every Canadian province. Dark-coloured containers warm up faster in spring and extend the season on both ends. Choose a 5-gallon or larger pot for cabbage and water daily during hot summer weather, since containers dry out quickly.
When is the first fall frost in New Brunswick?
First fall frost dates in New Brunswick range from October 8 in the coldest areas to October 12 in the warmest. For a fall cabbage crop, count back from your local first-frost date and plant around July 20–30.