🍅 Can I Plant Tomatillo in Seattle, WA?
Conditions are above the minimum safe threshold but still below ideal for Tomatillo. Overnight lows of 65°F+ would give much better results. Note: timing is tight — harvest may run close to the average first fall frost around Nov 10. Consider a fast-maturing variety.
Growing Tomatillo 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), aim to direct sow or transplant tomatillo outside around April — approximately 2 weeks after your last expected frost. Starting seeds indoors 6 weeks before the last frost date gives you a significant head start.
Tomatillo thrives between 65°F and 90°F. It is frost-sensitive, meaning a single freeze at 32°F will damage or kill it — always wait until frost danger has fully passed. Expect 75–100 days from transplant to first harvest. Plant at least 2 for cross-pollination. Papery husks split when ready to harvest. Very vigorous grower.
Frequently Asked Questions
When can I plant tomatillo in Seattle, WA?
In Seattle (last frost around March 18), aim to direct sow or transplant tomatillo outside around April — approximately 2 weeks after your last expected frost. For best results, start seeds indoors 6 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 tomatillo outside in Seattle right now?
That depends on the current weather forecast. Tomatillo needs temperatures above 50°F (ideally 65–90°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 tomatillo in Seattle 2026?
Yes — Tomatillo grows well in Seattle, WA. With a Zone 8b climate and a growing season of ~242 days, Seattle is well-suited for warm-season crops like tomatillo. Just wait until after the last frost (around March 18) before moving plants outside.
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