Gardening in San Antonio-New Braunfels, TX
This metro spans USDA zones 8a to 9a, so there is no single zone for San Antonio-New Braunfels, TX and anyone who gives you one is rounding. 86% of its ZIP codes are zone 9a; the rest are not.
Which zone you are in depends where you are
San Antonio-New Braunfels, TX covers 3 hardiness zones. A guide that gives the metro one zone has picked whichever is largest and rounded everyone else into it — which is fine for the 86% in zone 9a and wrong for the other 14%. Here is the actual split.
| Zone | ZIP codes | Share | |
|---|---|---|---|
| 9a | 103 | 86% | |
| 8b | 16 | 13% | |
| 8a | 1 | 1% |
Zones are published per ZIP code, so yours is exact even though the metro's is not. The hardiness tool will tell you which one you are in.
Your freeze dates
Those are the earliest and latest medians among the 27 stations serving this metro — not an average, and not one station standing in for the rest. Half of years freeze later than a station's own median.
The spread is the point. Even in a metro that is one hardiness zone throughout, its stations disagree about the last spring freeze. Hardiness zone and frost date measure different things — a zone is the average annual coldest night, a freeze date is when the season turns — and a place can be uniform in one and varied in the other. Use the tools below with your own ZIP rather than the ends of this range.
Your growing season
NOAA publishes a growing-season length for each station, and across the 27 stations serving San Antonio-New Braunfels, TX it runs 212–302 days . That figure is published, not computed from the two freeze dates — subtracting one from the other gives the wrong answer wherever a season crosses New Year. Mean summer high (June–August) runs 91–98 °F , at or above the 90 °F point where cool-season crops bolt and tomato and pepper pollen fails — so midsummer sowings of lettuce and its relatives are worth holding here.
When to start seeds in San Antonio-New Braunfels, TX
Every spring job for 63 crop dates, counted from this metro's own last spring freeze. Each is a range across all 27 stations — the earliest and latest that job falls anywhere in the metro — because no one station speaks for the whole area.
| Crop | Job | When | Offset |
|---|---|---|---|
| Green Onions | Start indoors | January 1 – December 31 | 8 weeks before |
| Peppers | Start indoors | January 1 – December 31 | 8 weeks before |
| Bok Choy | Start indoors | January 4 – March 1 | 5 weeks before |
| Kohlrabi | Start indoors | January 4 – March 1 | 5 weeks before |
| Swiss Chard | Start indoors | January 4 – March 1 | 5 weeks before |
| Broccoli | Start indoors | January 7 – December 28 | 6 weeks before |
| Cabbage | Start indoors | January 7 – December 28 | 6 weeks before |
| Collards | Start indoors | January 7 – December 28 | 6 weeks before |
| Kale | Start indoors | January 7 – December 28 | 6 weeks before |
| Leaf Lettuce | Start indoors | January 7 – December 28 | 6 weeks before |
| Peas | Direct sow | January 7 – December 28 | 6 weeks before |
| Spinach | Direct sow | January 7 – December 28 | 6 weeks before |
| Sweet Potato | Start indoors | January 7 – December 28 | 6 weeks before |
| Tomatoes | Start indoors | January 7 – December 28 | 6 weeks before |
| Arugula | Direct sow | January 11 – March 8 | 4 weeks before |
| Baby Salad Greens | Direct sow | January 11 – March 8 | 4 weeks before |
| Beets | Direct sow | January 11 – March 8 | 4 weeks before |
| Green Onions | Direct sow | January 11 – March 8 | 4 weeks before |
| Mustard Greens | Direct sow | January 11 – March 8 | 4 weeks before |
| Okra | Start indoors | January 11 – March 8 | 4 weeks before |
| Radishes | Direct sow | January 11 – March 8 | 4 weeks before |
| Turnips | Direct sow | January 11 – March 8 | 4 weeks before |
| Cabbage | Set out | January 18 – March 15 | 3 weeks before |
| Carrots | Direct sow | January 18 – March 15 | 3 weeks before |
| Collards | Direct sow | January 18 – March 15 | 3 weeks before |
| Collards | Set out | January 18 – March 15 | 3 weeks before |
| Cucumbers | Start indoors | January 18 – March 15 | 3 weeks before |
| Green Onions | Set out | January 18 – March 15 | 3 weeks before |
| Kale | Direct sow | January 18 – March 15 | 3 weeks before |
| Kale | Set out | January 18 – March 15 | 3 weeks before |
| Kohlrabi | Direct sow | January 18 – March 15 | 3 weeks before |
| Kohlrabi | Set out | January 18 – March 15 | 3 weeks before |
| Leaf Lettuce | Direct sow | January 18 – March 15 | 3 weeks before |
| Pumpkins | Start indoors | January 18 – March 15 | 3 weeks before |
| Summer Squash | Start indoors | January 18 – March 15 | 3 weeks before |
| Winter Squash | Start indoors | January 18 – March 15 | 3 weeks before |
| Zucchini | Start indoors | January 18 – March 15 | 3 weeks before |
| Bok Choy | Direct sow | January 25 – March 22 | 2 weeks before |
| Bok Choy | Set out | January 25 – March 22 | 2 weeks before |
| Broccoli | Set out | January 25 – March 22 | 2 weeks before |
| Cilantro | Direct sow | January 25 – March 22 | 2 weeks before |
| Leaf Lettuce | Set out | January 25 – March 22 | 2 weeks before |
| Swiss Chard | Direct sow | January 25 – March 22 | 2 weeks before |
| Swiss Chard | Set out | January 25 – March 22 | 2 weeks before |
| Dill | Direct sow | February 1 – March 29 | 1 week before |
| Bush Beans | Direct sow | February 15 – April 12 | 1 week after |
| Cucumbers | Set out | February 15 – April 12 | 1 week after |
| Pumpkins | Direct sow | February 15 – April 12 | 1 week after |
| Pumpkins | Set out | February 15 – April 12 | 1 week after |
| Summer Squash | Direct sow | February 15 – April 12 | 1 week after |
| Summer Squash | Set out | February 15 – April 12 | 1 week after |
| Sweet Corn | Direct sow | February 15 – April 12 | 1 week after |
| Tomatoes | Set out | February 15 – April 12 | 1 week after |
| Winter Squash | Direct sow | February 15 – April 12 | 1 week after |
| Winter Squash | Set out | February 15 – April 12 | 1 week after |
| Zucchini | Direct sow | February 15 – April 12 | 1 week after |
| Zucchini | Set out | February 15 – April 12 | 1 week after |
| Cucumbers | Direct sow | February 22 – April 19 | 2 weeks after |
| Okra | Direct sow | February 22 – April 19 | 2 weeks after |
| Okra | Set out | February 22 – April 19 | 2 weeks after |
| Peppers | Set out | February 22 – April 19 | 2 weeks after |
| Southern Peas | Direct sow | February 22 – April 19 | 2 weeks after |
| Sweet Potato | Set out | February 22 – April 19 | 2 weeks after |
The week offsets are conventional extension guidance and vary by variety; the freeze dates they are counted from are measured. For a single date rather than a range, run when do I start my seeds? with your own ZIP code.
What survives the winter changes across San Antonio-New Braunfels, TX
Of 74 perennial fruits, nuts, berries, vegetables and herbs, 57 come through the winter in zone 8a and only 46 in zone 9a. That is a different garden at each end of the same metro.
| Zone | ZIPs | Survive | Fail for being too warm |
|---|---|---|---|
| 8a | 1 | 57 of 74 | 8 |
| 8b | 16 | 54 of 74 | 11 |
| 9a | 103 | 46 of 74 | 25 |
The last column is the counterintuitive one, and it is why the totals do not simply rise as the winters get milder. Most temperate fruit needs a documented number of hours below about 45 °F to break dormancy and set a crop, so an apple fails in a winter that is too warm; currants and rhubarb cook in the summer heat that comes with it. See the full list with reasons.
The 27 stations behind these numbers
Every figure above comes from these, and each is named so you can check it. Distances vary by ZIP code, so the tools report yours rather than this page guessing.
| Station | NOAA ID | Last spring freeze | First fall freeze | Season |
|---|---|---|---|---|
| Austin San Antonio, TX | USW00012971 | March 1 | November 26 | 273 days |
| Blanco, TX | USC00410832 | March 20 | November 10 | 236 days |
| Boerne, TX | USC00410902 | March 15 | November 13 | 243 days |
| Canyon Dam, TX | USC00411429 | March 1 | December 1 | 276 days |
| Charlotte 5 Nnw, TX | USC00411663 | February 26 | November 28 | 278 days |
| Choke Canyon Dam, TX | USC00411720 | February 8 | December 6 | 302 days |
| Cross, TX | USC00412125 | March 8 | November 17 | 254 days |
| Floresville, TX | USC00413201 | March 6 | November 20 | 261 days |
| Hondo Muni AP, TX | USW00012962 | March 6 | November 20 | 263 days |
| Hondo, TX | USC00414254 | February 28 | November 27 | 274 days |
| Kerrville 3 Nne, TX | USC00414782 | March 27 | November 7 | 226 days |
| Luling, TX | USC00415429 | March 5 | November 23 | 263 days |
| Lytle 3W, TX | USC00415454 | February 24 | December 2 | 283 days |
| Medina 1Ne, TX | USC00415742 | March 16 | November 15 | 244 days |
| New Braunfels Wfo, TX | USC00416273 | February 25 | November 25 | 274 days |
| New Braunfels, TX | USC00416276 | March 8 | November 18 | 253 days |
| Nixon, TX | USC00416368 | March 7 | November 22 | 260 days |
| Pleasanton, TX | USC00417111 | February 27 | November 28 | 274 days |
| Poteet, TX | USC00417215 | February 22 | December 1 | 281 days |
| Prade Rch, TX | USC00417232 | April 5 | November 2 | 212 days |
| Randolph Afb, TX | USW00012911 | February 21 | December 5 | 289 days |
| San Antonio Incarnate Word, TX | USC00417947 | February 25 | November 28 | 277 days |
| San Antonio INTL AP, TX | USW00012921 | February 26 | November 28 | 277 days |
| San Antonio Kelly Afb, TX | USW00012909 | February 22 | December 2 | 284 days |
| San Antonio Stinson AP, TX | USW00012970 | February 20 | December 3 | 291 days |
| San Antonio/Seaworld, TX | USC00418169 | February 18 | December 9 | 296 days |
| San Marcos, TX | USC00417983 | February 28 | November 29 | 273 days |
These are medians, not averages — NOAA publishes freeze dates as a probability distribution, and half of years freeze later than the date shown.
Work out your own dates
Each of these takes a ZIP code and answers for that ZIP alone, citing the station it used and how far away it is. There is a ZIP box in the header of every page.
- What survives my winter?
Runs on the hardiness zone, so it answers for all of San Antonio-New Braunfels, TX at once — zone across 74 perennial fruits, berries, vegetables and herbs.
- When do I start my seeds?
Dates every spring job from your own last freeze — sow indoors, set out, direct sow.
- When do I sow the next round?
How often each crop is worth re-sowing, and when the next sowing is due.
- What can I still plant?
Counts the growing days left before your first fall freeze, crop by crop.
Where these numbers come from
The hardiness zone is the USDA 2023 Plant Hardiness Zone Map, published per ZIP code by PRISM at Oregon State. The freeze dates are NOAA's 1991–2020 Climate Normals, read from every station whose normals cover a ZIP code in this metro. Nothing here is estimated, and no station stands in for another.
This page names no single station on purpose. Picking one to represent a metro sounds reasonable and is not: the station serving the most ZIP codes is an artifact of where ZIP centroids happen to fall, and it selects a lock on the Monongahela for Pittsburgh and a far southern suburb for Chicago. A range across every station is true; a single cited date for a whole metro is not.