When to Plant Collard Greens in New Brunswick
Published: April 24, 2026 · Updated: April 27, 2026
Extremely cold-hardy leafy brassica — withstands temperatures to -10°C. Direct sow or transplant 3–4 weeks before last frost. Fall plantings produce the best-flavored greens after frost.
Collard Greens grow well in this province with appropriate variety selection and standard Canadian planting timing.
Collard Greens Planting Window for New Brunswick
Start seeds indoors: April 5–12 (varies by city — earliest in southern Ontario, latest on the Prairies)
Transplant outdoors: April 19–29 (after last frost in your city)
Direct sow outdoors: April 19–29
Minimum soil temperature: 7°C (45°F)
Days to harvest: 60–75 days
Sun requirement: Full sun to partial shade
Fall crop planting: August 3–13
⚠ Direct sow or transplant collard greens 3–4 weeks before last frost. Extremely cold hardy — withstands temps to 15°F. Can be grown as a perennial in Zones 8+. Fall planting produces the best-flavored greens.
New Brunswick Cities — Collard Greens Planting Dates
City-specific frost dates and collard green planting windows for New Brunswick.
Growing Collard Greens in New Brunswick
- Harvest outer leaves continuously once plants reach 10 inches — the central growing point produces for months.
- In Zones 8+ collard greens often overwinter and produce for 2–3 years as a perennial.
- Frost improves flavor dramatically — southern tradition is to wait for the first frost before harvesting.
- Blanch and freeze excess harvest — collard greens freeze beautifully and provide winter vitamins.
Companion Planting for Collard Greens
In New Brunswick gardens, pair collard green with Onion, Garlic, Dill, Celery. Avoid planting near Tomato, Strawberry, Bean, which compete with or inhibit collard green growth.
Common Pests and Problems
Collard Greens in New Brunswick are commonly affected by Cabbage Worm, Aphid, Flea Beetle, Cabbage Looper. 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 collard green in New Brunswick?
In New Brunswick (Canadian Zone 5b), start seeds indoors around April 5 and transplant around April 19. Collard Greens grow well in this province with appropriate variety selection and standard Canadian planting timing.
What is the best collard green variety for New Brunswick?
New Brunswick gardeners should prioritise varieties bred for shorter seasons or Canadian climates. For collard greens in Canadian Zone 5b, look for cultivars labelled under 75 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 collard green?
New Brunswick spans Canadian Zone 5b with frost-free seasons ranging from roughly 151 to 155 days. Collard Greens 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 collard green 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 collard green 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 collard green crop, count back from your local first-frost date and plant around August 3–13.