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Planting calendar for ZIP 99349 (Mattawa, WA)

When to plant vegetables in Mattawa, WA (USDA hardiness zone 7a). Typical last spring frost around Mar 24, 2026 13 days year to year), first fall frost around Nov 4, 202610 days).

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

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

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Month by month in Mattawa, WA

January

February

March

April

August

September

December

Understand your frost dates

Frost dates for ZIP 99349: NOAA 1991-2020 normals (USC00456747 PRIEST RAPIDS DAM, WA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.