🥦 Can I Plant Brussels Sprouts in Seattle, WA?

2026 planting guide for Zone 8b · Last frost ~March 18 · Growing season ~242 days

✅ YES — Good time to plant for a fall harvest

Brussels Sprouts thrives in cool weather and can be planted now for a fall harvest. Sow seeds soon — they'll be ready around Oct 28–Nov 27, well before the average first frost around Nov 10.

Planting window: Jul 30 – Aug 13
Sow brussels sprouts seeds directly now for a fall harvest. Expect to harvest around Oct 28.
Live result based on current forecast for Seattle, WA · Updates every 6 hours
USDA Zone
8b
Last Spring Frost
~March 18
First Fall Frost
November 15
Growing Season
~242 days
Ideal Temp for Brussels Sprouts
45–65°F
Frost Risk
✅ Tolerant

Growing Brussels Sprouts in Seattle

Seattle's Zone 8b maritime climate is notoriously cool and cloudy, which means warm-season crops like tomatoes and peppers need all the help they can get. A south-facing wall or greenhouse extension is almost essential for tomatoes. On the plus side, cool-season crops like kale, lettuce, and peas absolutely thrive in Seattle's mild, moist conditions.

In Seattle (last frost around March 18), brussels sprouts can go out around January — approximately 8 weeks before the last expected frost, making it an early-season opportunity. Starting seeds indoors 12 weeks before the last frost date gives you a significant head start.

Brussels Sprouts thrives between 45°F and 65°F. It tolerates temperatures as low as 28°F, making it a candidate for early spring planting before the last frost date. Expect 90–120 days from transplant to first harvest. Long season. Best harvested after first frost — sweetens flavor.

Frequently Asked Questions

When can I plant brussels sprouts in Seattle, WA?

In Seattle (last frost around March 18), brussels sprouts can go out around January — approximately 8 weeks before the last expected frost, making it an early-season opportunity. For best results, start seeds indoors 12 weeks before that — giving you strong transplants ready to go out at the right time.

What is the USDA hardiness zone for Seattle?

Seattle, WA is in USDA Plant Hardiness Zone 8b. The last expected spring frost is around March 18, and the first fall frost arrives around November 15. This zone classification helps you understand which perennials survive winter and when annual vegetables can safely go outdoors.

Is it safe to plant brussels sprouts outside in Seattle right now?

That depends on the current weather forecast. Brussels Sprouts needs temperatures above 28°F (ideally 45–65°F) to thrive. CanIPlant checks your real 7-day forecast and any active frost alerts to give you a live YES, NO, or WAIT answer — just enter your ZIP code.

Can I grow brussels sprouts in Seattle 2026?

Yes — Brussels Sprouts grows well in Seattle, WA. With a Zone 8b climate and a growing season of ~242 days, Seattle is well-suited for cool-season crops like brussels sprouts. As a frost-tolerant crop, brussels sprouts can even go out a few weeks before the last frost date.

Grow Brussels Sprouts in Other Cities

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