🥦 Can I Plant Brussels Sprouts in Portland, OR?

2026 planting guide for Zone 8b · Last frost ~March 25 · Growing season ~235 days

✅ YES — Good temps, but watch for heat — highs near 88°F

Temperature conditions are suitable for Brussels Sprouts. Highs near 88°F are on the warm side — make sure plants have plenty of water. The season is running warmer than normal, which has opened this window earlier than usual.

Planting window: Jun 13 – Jun 27
Good to go — plant now while conditions are right.
Live result based on current forecast for Portland, OR · Updates every 6 hours
USDA Zone
8b
Last Spring Frost
~March 25
First Fall Frost
November 15
Growing Season
~235 days
Ideal Temp for Brussels Sprouts
45–65°F
Frost Risk
✅ Tolerant

Growing Brussels Sprouts in Portland

Portland's Zone 8b Willamette Valley climate is excellent for many crops, but the famously cloudy, cool summers challenge heat-loving plants. Tomatoes, peppers, and melons need the warmest microclimate in your yard. Cool-season crops — kale, chard, lettuce, brassicas — are where Portland gardens truly shine, often producing well into December.

In Portland (last frost around March 25), 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 Portland, OR?

In Portland (last frost around March 25), 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 Portland?

Portland, OR is in USDA Plant Hardiness Zone 8b. The last expected spring frost is around March 25, 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 Portland 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 Portland 2026?

Yes — Brussels Sprouts grows well in Portland, OR. With a Zone 8b climate and a growing season of ~235 days, Portland 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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