Seed-start answer
Spinach is usually direct-sown around Dec 28
This uses ZIP 94102, the San Francisco frost station, and the Jan 25 last-frost estimate.
Seed starting schedule
Spinach dates for San Francisco, CA
| Step | Date | How to use it |
|---|---|---|
| Direct Sow | December 28, 2025 | Sow seed outside when the crop and soil can handle the window. |