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Planting calendar for ZIP 91761 (Ontario, CA)

When to plant vegetables in Ontario, CA (USDA hardiness zone 10a). Typical last spring frost around Jan 4, 2026 21 days year to year), first fall frost around Dec 30, 202620 days).

Playing it safe? Spring frost holds off until about Jan 30, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Ontario, CA

January

February

October

November

December

Understand your frost dates

Frost dates for ZIP 91761: NOAA 1991-2020 normals (USW00003102 ONTARIO INTL AP, CA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.