GrowZone

Seed-start answer

Start tomatoes seeds indoors around Dec 9

In ZIP 92805, start tomatoes seeds indoors around Dec 9, about 42 days before the Jan 20 last-frost estimate.

Source: anaheim-fullerton frost station, USDA zone 10b, last updated 2026-06-28. Verify locally before planting high-value crops because microclimates, current weather, and yard exposure can move the safe date.

This uses ZIP 92805, the Anaheim frost station, and the Jan 20 last-frost estimate.

Seed starting schedule

Tomatoes dates for Anaheim, CA

StepDateHow to use it
Start IndoorsDecember 9, 2025Start seeds under lights or in a bright indoor seed-starting space.
Transplant OutdoorsJanuary 27, 2026Move hardened-off seedlings outside after the frost-risk window.