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Castro Valley, CA planting calendar

When to plant vegetables in Castro Valley, CA (USDA hardiness zone 9b). Typical last spring frost around Jan 2, 2026 18 days year to year), first fall frost around Dec 25, 202618 days).

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

Want exact dates for your address, a drag-and-drop bed layout, and reminders when it’s time to sow? Enter your ZIP:

Or get a printable Castro Valley calendar and sowing reminders by email:

Still time to plant

As of today, these crops can still reach harvest before Castro Valley, CA’s first frost (~Dec 25, 2026) — fastest first.

Month by month in Castro Valley, CA

January

February

October

November

December

Understand your frost dates

Frost dates are NOAA 1991–2020 climate normals for a representative location in Castro Valley, CA (covering 2 ZIPs); your exact dates depend on your address. Schedules are guidance, not guarantees.