Seed-start answer
Spinach is usually direct-sown around Mar 8
In ZIP 74103, spinach is usually direct-sown around Mar 8 instead of started indoors.
Source: tulsa-intl frost station, USDA zone 7b, 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 74103, the Tulsa frost station, and the Apr 5 last-frost estimate.
Seed starting schedule
Spinach dates for Tulsa, OK
| Step | Date | How to use it |
|---|---|---|
| Direct Sow | March 8, 2026 | Sow seed outside when the crop and soil can handle the window. |