Seed-start answer
Spinach is usually direct-sown around Mar 28
In ZIP 60601, spinach is usually direct-sown around Mar 28 instead of started indoors.
Source: chicago-ohare frost station, USDA zone 6a, 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 60601, the Chicago frost station, and the Apr 25 last-frost estimate.
Seed starting schedule
Spinach dates for Chicago, IL
| Step | Date | How to use it |
|---|---|---|
| Direct Sow | March 28, 2026 | Sow seed outside when the crop and soil can handle the window. |