GrowZone

Seed-start answer

Radishes is usually direct-sown around Feb 1

This uses ZIP 78205, the San Antonio frost station, and the Mar 1 last-frost estimate.

Seed starting schedule

Radishes dates for San Antonio, TX

StepDateHow to use it
Direct SowFebruary 1, 2026Sow seed outside when the crop and soil can handle the window.