Seed-start answer
Radishes is usually direct-sown around Jan 8
In ZIP 85001, radishes is usually direct-sown around Jan 8 instead of started indoors.
Source: phoenix-skyharbor frost station, USDA zone 10a, 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 85001, the Phoenix frost station, and the Feb 5 last-frost estimate.
Seed starting schedule
Radishes dates for Phoenix, AZ
| Step | Date | How to use it |
|---|---|---|
| Direct Sow | January 8, 2026 | Sow seed outside when the crop and soil can handle the window. |