When to Plant Collard Greens in Manitoba
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 Manitoba
Start seeds indoors: April 20–27 (varies by city — earliest in southern Ontario, latest on the Prairies)
Transplant outdoors: May 4–14 (after last frost in your city)
Direct sow outdoors: May 4–14
Minimum soil temperature: 7°C (45°F)
Days to harvest: 60–75 days
Sun requirement: Full sun to partial shade
Fall crop planting: July 14–24
⚠ 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.
Manitoba Cities — Collard Greens Planting Dates
City-specific frost dates and collard green planting windows for Manitoba.
Growing Collard Greens in Manitoba
- 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 Manitoba 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 Manitoba 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 Manitoba?
In Manitoba (Canadian Zone 3a), start seeds indoors around April 20 and transplant around May 4. Collard Greens grow well in this province with appropriate variety selection and standard Canadian planting timing.
What is the best collard green variety for Manitoba?
Manitoba gardeners should prioritise varieties bred for shorter seasons or Canadian climates. For collard greens in Canadian Zone 3a, 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 Manitoba's climate affect collard green?
Manitoba spans Canadian Zone 3a with frost-free seasons ranging from roughly 120 to 120 days. Collard Greens actually prefer the cooler spring and fall windows typical of Manitoba, making them one of the most reliable crops in the province.
Can I grow collard green in containers in Manitoba?
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 Manitoba?
First fall frost dates in Manitoba range from September 22 in the coldest areas to September 22 in the warmest. For a fall collard green crop, count back from your local first-frost date and plant around July 14–24.