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Planting calendar for ZIP 98103 (Seattle, WA)

When to plant vegetables in Seattle, WA (USDA hardiness zone 9a). Typical last spring frost around Mar 8, 2026 17 days year to year), first fall frost around Nov 23, 202616 days).

Playing it safe? Spring frost holds off until about Mar 29, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Seattle, WA planting calendar for dates typical of the whole city.

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

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Month by month in Seattle, WA

January

February

March

April

September

December

Understand your frost dates

Frost dates for ZIP 98103: NOAA 1991-2020 normals (USW00094290 SEATTLE SAND PT WSFO, WA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.