When to plant in San Antonio, TX
USDA Zone 9aEverything below — frost dates, hardiness zone, and what to plant when in San Antonio, Texas — is derived from the closest NOAA station with complete climate normals.
A generous ~276-day season lets San Antonio gardeners direct-sow more and still ripen long-maturity crops like melons and winter squash. Zone 9a is warm enough that San Antonio can grow subtropical perennials, and the short (or absent) frost period barely limits the annual calendar.
Frost probability
SAN ANTONIO INCARNATE WORD · 1991–2020The date the last spring and first fall frost occur, by threshold and probability. A 90% date is later in spring — and earlier in fall — than a 10% date; the 50% · 32°F row is what most gardeners plan around. These are San Antonio’s own odds, recorded at SAN ANTONIO INCARNATE WORD.
| Threshold | SPRING 10% | SPRING 50% | SPRING 90% | FALL 10% | FALL 50% | FALL 90% |
|---|---|---|---|---|---|---|
| 36°F | Apr 2 | Mar 10 | Feb 18 | Oct 30 | Nov 16 | Dec 3 |
| 32°F | Mar 19 | Feb 25 | Jan 28 | Nov 7 | Nov 28 | Dec 21 |
| 28°F | Mar 5 | Feb 5 | Dec 31 | Nov 19 | Dec 15 | Jan 20 |
Download this table as CSV ↓ — every threshold and probability, plus this city’s planting-window dates.
What to plant now
TODAY · JULY 19Full-year planting calendar
Each bar is the exact window to take a planting action in San Antonio, drawn to the day from the local frost dates. The dashed line is today.
Nearby weather stations
3 within 11 km · complete 32°F normalsWhen stations disagree by more than a few days, that spread is real microclimate variation — elevation, water, urban heat. Judge which station best matches your own yard.
San Antonio planting FAQ
When is the last spring frost in San Antonio, TX?
On average, the last spring frost in San Antonio is around February 25 (50% probability at 32°F, from 1991–2020 NOAA normals). Wait until after this date to set out tender plants like tomatoes and peppers.
When is the first fall frost in San Antonio, TX?
Expect San Antonio's first fall frost near November 28 — a 50% chance of 32°F by that date. Bring in or cover tender crops ahead of it.
What hardiness zone is San Antonio in?
San Antonio is in USDA hardiness zone 9a. In zone 9a, winters are mild — many tender perennials overwinter here.
How long is the growing season in San Antonio?
There are roughly 276 frost-free days in San Antonio (a long growing season), running from the average last frost around February 25 to the first fall frost near November 28.
When should I plant tomatoes in San Antonio?
In San Antonio, start tomato seeds indoors around December 31–January 14, then transplant seedlings outdoors around March 4 once the danger of frost has passed.
Never miss a window in San Antonio
An email when it’s time to start seeds, transplant, and sow — timed to San Antonio’s frost dates. Double opt-in, one-click unsubscribe, no spam.
Nearby cities
8 within reach- Leon Valley · 9 km
- Live Oak · 21 km
- Converse · 22 km
- Universal City · 23 km
- Selma · 24 km
- Timberwood Park · 27 km
- Schertz · 29 km
- Scenic Oaks · 30 km
Frost dates recorded at SAN ANTONIO INCARNATE WORD, 5 km from the city center · 1991–2020 NOAA climate normals · zone from the USDA/PRISM 2023 map. How we compute this.
BlissGarden. "When to Plant in San Antonio, TX — Frost Dates & Zone 9a." Frost normals: NOAA NCEI U.S. Climate Normals 1991–2020, station USC00417947. Retrieved from https://blissgarden.com/texas/san-antonio.