🥬 Can I Plant Spinach in Seattle, WA?

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

✅ YES — Good temps, but watch for heat — highs near 86°F

Temperature conditions are suitable for Spinach. Highs near 86°F are on the warm side — make sure plants have plenty of water.

Planting window: Jul 2 – Jul 16
Good to go — plant now while conditions are right.
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 Spinach
40–65°F
Frost Risk
✅ Tolerant

Growing Spinach 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), spinach can go out around February — approximately 6 weeks before the last expected frost, making it an early-season opportunity. Starting seeds indoors 4 weeks before the last frost date gives you a significant head start.

Spinach thrives between 40°F and 65°F. It tolerates temperatures as low as 25°F, making it a candidate for early spring planting before the last frost date. Expect 37–50 days from transplant to first harvest. Very cold hardy. Plant early spring or fall.

Frequently Asked Questions

When can I plant spinach in Seattle, WA?

In Seattle (last frost around March 18), spinach can go out around February — approximately 6 weeks before the last expected frost, making it an early-season opportunity. For best results, start seeds indoors 4 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 spinach outside in Seattle right now?

That depends on the current weather forecast. Spinach needs temperatures above 25°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 spinach in Seattle 2026?

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

Grow Spinach in Other Cities

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

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