San Antonio, TX · zone 9a · ~278 frost-free days
When to plant a garden in San Antonio.
In San Antonio, the typical last spring frost lands around Feb 24 and the first fall frost around Nov 29, giving you about 278 frost-free days. Cool-season crops go out before the last frost; warm-season crops wait until after it.
The 2026 windows
Sow dates for San Antonio, keyed to your frost.
| Crop | Start indoors | Spring sow / set out | Fall sow |
|---|---|---|---|
| Tomato, slicing | Jan 20 to Mar 22 | Mar 3 to May 3 | — |
| Lettuce, leaf | — | Jan 17 to Mar 3 | Sep 15 to Nov 14 |
| Carrot | — | Jan 17 to Feb 19 | Sep 3 to Sep 29 |
| Bush Bean | — | Feb 24 to Apr 16 | Aug 15 to Sep 17 |
| Cucumber, slicing | — | Mar 3 to Jun 2 | Jul 29 to Aug 29 |
| Pepper, bell | Jan 29 to Mar 22 | Mar 12 to May 3 | — |
| Kale | Dec 6 to Jan 3 | Jan 17 to Feb 14 | Aug 29 to Oct 14 |
| Spinach | — | Jan 3 to Feb 14 | Sep 15 to Nov 3 |
San Antonio sits in Zone 9a, but two gardens in the same city can be a week or two apart. The planner works from your ZIP code's frost dates, not the zone, so the dates land right for your block, not the metro average.
Build your San Antonio garden plan.
Tell the free planner what you want to eat and who you're feeding. It returns plant counts, spacing, and frost-safe sow dates for ZIP 78205 in about 60 seconds.