🥬 Can I Plant Arugula 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

Arugula thrives in cool weather and can be planted now for a fall harvest. Sow seeds soon — they'll be ready around Aug 19–Sep 8, well before the average first frost around Nov 10.

Planting window: Jul 30 – Aug 13
Sow arugula seeds directly now for a fall harvest. Expect to harvest around Aug 19.
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 Arugula
40–65°F
Frost Risk
✅ Tolerant

Growing Arugula 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), arugula can go out around February — approximately 6 weeks before the last expected frost, making it an early-season opportunity.

Arugula thrives between 40°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 20–40 days from transplant to first harvest. Fast-growing. Bolts quickly in heat — succession plant every 2 weeks.

Frequently Asked Questions

When can I plant arugula in Seattle, WA?

In Seattle (last frost around March 18), arugula can go out around February — approximately 6 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 arugula outside in Seattle right now?

That depends on the current weather forecast. Arugula needs temperatures above 28°F (ideally 40–65°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 arugula in Seattle 2026?

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

Grow Arugula in Other Cities

New York, NYLos Angeles, CAChicago, ILHouston, TXPhoenix, AZPhiladelphia, PASan Antonio, TXSan Diego, CA

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