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Planting calendar for ZIP 92377 (Rialto, CA)

When to plant vegetables in Rialto, CA (USDA hardiness zone 10a). Typical last spring frost around Jan 10, 2026 23 days year to year), first fall frost around Jan 2, 202623 days).

Playing it safe? Spring frost holds off until about Feb 8, 2026 in roughly 9 years out of 10 — a good target for tender crops like tomatoes and peppers.

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

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Month by month in Rialto, CA

January

February

October

November

December

Understand your frost dates

Frost dates for ZIP 92377: NOAA 1991-2020 normals (USC00047473 RIVERSIDE CITRUS EXP, CA US). Your exact dates depend on your address and microclimate. Schedules are guidance, not guarantees.