When to Plant Brussels Sprouts in New Brunswick
Published: April 24, 2026 · Updated: April 27, 2026
Fall-harvest brassica planted in midsummer. Count back 90 days from first fall frost to find your transplant date. Flavor sweetens dramatically after cold nights and light frost.
Brussels Sprouts grow well in this province with appropriate variety selection and standard Canadian planting timing.
Brussels Sprouts Planting Window for New Brunswick
Start seeds indoors: April 5–12 (varies by city — earliest in southern Ontario, latest on the Prairies)
Transplant outdoors: August 2–12 (after last frost in your city)
Minimum soil temperature: 7°C (45°F)
Days to harvest: 80–100 days
Sun requirement: Full sun (6+ hours)
Fall crop planting: July 13–23
⚠ Brussels sprouts are planted in midsummer for a fall harvest. Count back 90 days from your first fall frost to find the transplant date. Start seeds indoors 4–6 weeks before that date. Flavor improves after frost.
New Brunswick Cities — Brussels Sprouts Planting Dates
City-specific frost dates and brussels sprout planting windows for New Brunswick.
Growing Brussels Sprouts in New Brunswick
- Count back 90 days from first fall frost to find the transplant date — this is the most important Brussels sprout timing rule.
- Pinch the top of each plant about a month before first frost — this channels energy into sprout formation.
- Harvest sprouts from the bottom up as they reach 1-inch diameter; top sprouts finish last.
- Flavor improves after the first frost — wait for cold weather before harvesting for sweetness.
Companion Planting for Brussels Sprouts
In New Brunswick gardens, pair brussels sprout with Onion, Celery, Dill, Beet. Avoid planting near Tomato, Strawberry, Pepper, which compete with or inhibit brussels sprout growth.
Common Pests and Problems
Brussels Sprouts in New Brunswick are commonly affected by Cabbage Worm, Aphid, Cabbage Looper, 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 brussels sprout in New Brunswick?
In New Brunswick (Canadian Zone 5b), start seeds indoors around April 5 and transplant around August 2. Brussels Sprouts grow well in this province with appropriate variety selection and standard Canadian planting timing.
What is the best brussels sprout variety for New Brunswick?
New Brunswick gardeners should prioritise varieties bred for shorter seasons or Canadian climates. For brussels sprouts 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 brussels sprout?
New Brunswick spans Canadian Zone 5b with frost-free seasons ranging from roughly 151 to 155 days. Brussels Sprouts 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 brussels sprout 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 brussels sprout 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 brussels sprout crop, count back from your local first-frost date and plant around July 13–23.