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Planting calendar for ZIP 99128 (Farmington, WA)

When to plant vegetables in Farmington, WA (USDA hardiness zone 6b). Typical last spring frost around May 15, 2026 13 days year to year), first fall frost around Sep 21, 202614 days).

Playing it safe? Spring frost holds off until about May 31, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Farmington, WA

February

March

April

May

June

July

Understand your frost dates

Frost dates for ZIP 99128: NOAA 1991-2020 normals (USC00107301 POTLATCH 3 NNE, ID US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.