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Planting calendar for ZIP 94574 (Saint Helena, CA)

When to plant vegetables in Saint Helena, CA (USDA hardiness zone 9b). Typical last spring frost around Feb 3, 2026 29 days year to year), first fall frost around Dec 4, 202619 days).

Playing it safe? Spring frost holds off until about Mar 12, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

See the full Saint Helena, CA planting calendar for dates typical of the whole city.

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Month by month in Saint Helena, CA

January

February

March

September

November

December

Understand your frost dates

Frost dates for ZIP 94574: NOAA 1991-2020 normals (USC00047643 SAINT HELENA, CA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.