When to Plant in Seattle, WA

Seattle's maritime climate is excellent for cool-season crops but challenging for warm-season vegetables. Zone 8b with a last frost around April 4, but the cool, overcast summers limit heat-loving crops like tomatoes and peppers.

Seattle gardeners thrive with a year-round approach to cool-season vegetables: kale, chard, lettuce, broccoli, and root vegetables grow nearly continuously. Warm-season crops require strategic variety selection and the warmest, most protected spots in the garden.

FAQ

When is the last frost date in Seattle, WA?

Seattle's average last frost date is around April 4. However, the cool, cloudy summers are the bigger growing challenge — not the frost dates.

Can I grow tomatoes in Seattle?

Yes, but choose carefully. Select early-maturing varieties (60–70 days) like Stupice, Siletz, Early Girl, or Legend. Plant in your warmest, sunniest spot. August and September are often the best harvest months.

What grows best in Seattle?

Seattle excels at cool-season crops: kale, lettuce, chard, broccoli, peas, carrots, and root vegetables grow almost year-round. Lean into the maritime climate rather than fighting it.

How does Seattle compare to Eastern Washington for gardening?

Night and day. Spokane's hot, sunny summers are great for tomatoes, peppers, and melons — but requires irrigation. Seattle's cool, wet climate favors year-round cool-season crops but limits heat-lovers.

How does Plan My Garden help Seattle gardeners?

Enter your Seattle zip code for planting dates calibrated to the maritime climate — including specific variety recommendations for Seattle's cool summers.

Frost dates for Seattle ZIP codes

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