🧄 Can I Plant Garlic in Seattle, WA?

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

⏳ WAIT — Too late to harvest before first frost (~Nov 10)

Garlic needs at least 240 days to harvest, but there are only ~102 days before the average first fall frost around Nov 10. Wait until next spring for best results.

Planting window: Oct 26 – Nov 9 (next spring)
Skip this season. Plan to start garlic again around Oct 26 next spring.
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 Garlic
35–70°F
Frost Risk
✅ Tolerant

Growing Garlic 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), garlic can go out around October — approximately 20 weeks before the last expected frost, making it an early-season opportunity.

Garlic thrives between 35°F and 70°F. It tolerates temperatures as low as 20°F, making it a candidate for early spring planting before the last frost date. Expect 240–270 days from transplant to first harvest. Plant in fall, harvest next summer.

Frequently Asked Questions

When can I plant garlic in Seattle, WA?

In Seattle (last frost around March 18), garlic can go out around October — approximately 20 weeks before the last expected frost, making it an early-season opportunity.

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 garlic outside in Seattle right now?

That depends on the current weather forecast. Garlic needs temperatures above 20°F (ideally 35–70°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 garlic in Seattle 2026?

Yes — Garlic 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 garlic. As a frost-tolerant crop, garlic can even go out a few weeks before the last frost date.

Grow Garlic in Other Cities

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