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Planting calendar for ZIP 91901 (Alpine, CA)

When to plant vegetables in Alpine, CA (USDA hardiness zone 9b). Typical last spring frost around Feb 12, 2026 32 days year to year), first fall frost around Dec 24, 202625 days).

Playing it safe? Spring frost holds off until about Mar 25, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Alpine, CA

January

February

March

April

September

October

December

Understand your frost dates

Frost dates for ZIP 91901: NOAA 1991-2020 normals (USC00040136 ALPINE, CA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.