Frost dates for ZIP 78250 (San Antonio, TX)
Average last spring and first fall frost dates with 10%, 50% and 90% odds, from NOAA's 1991–2020 climate normals for the nearest weather station, San Antonio/seaworld, TX (4 miles away).
- Average last spring frostFeb 1850% chance of a 32°F freeze after this date
- Average first fall frostDec 950% chance of a 32°F freeze by this date
- Growing season (frost-free)296 daysmedian, 32°F threshold
- USDA hardiness zone9a20 to 25°F avg. coldest night
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This week in your yard
As of Oct 17, 2026, from your frost dates, zone and soil temperature. Lawn timing · Vegetables · Pruning · Plants
Soil temperature now
2-inch depth
72°F 55°F or warmer
24-hour average · latest 70°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of EAA Field Research Park (20 mi), Strey Ranch (35 mi), Holt Oaks Ranch (38 mi).
4-inch depth
74°F 55°F or warmer
24-hour average · latest 74°F, as of Oct 17, 11:00 PM CDT
Estimate Not a measurement at this ZIP: distance-weighted average of EAA Field Research Park (20 mi), Strey Ranch (35 mi), Holt Oaks Ranch (38 mi).
Fall: Texas A&M AgriLife times fall pre-emergent (for winter weeds such as annual bluegrass) to soil cooling to about 70°F for several days. The 50–55°F band is the spring trigger. Always read and follow the product label.
7-day forecast and frost risk
The latest National Weather Service 7-day forecast and any Frost Advisory or Freeze Warning for 78250 load here. You can also open the NWS forecast for this ZIP.
Pre-emergent
Soil is 74°F at 4 inches (estimated soil temperature, not a station reading). Fall pre-emergent (annual bluegrass, winter weeds): window open as soil cools through the 70s and 60s.
Fertilizer window
Lawn region: South Central plains. Timing only; always follow the product label.
- Bermudagrass (warm-season): Spring: Several weeks after the lawn is fully green (April–May) (about Apr 5 here, using green-up about 3–4 weeks after your average last frost); Summer: Every 4–6 weeks through mid-August (heaviest feeder of the group); Late: Light, low-nitrogen/high-potassium feeding about 4 weeks before first frost, or skip. Avoid: Heavy late-fall nitrogen (linked to spring dead spot).
- Tall fescue (cool-season): Early fall: September (main feeding); Late fall: November, while still green; Late winter: Optional light feeding February–March. Avoid: Feeding after mid-spring and through summer in the transition zone (stress and brown patch).
Plant now
- Lettuce: fall sowing Sep 30–Oct 28
- Lettuce: fall transplant Oct 14–Nov 4
- Spinach: fall sowing Oct 14–Nov 4
- Bok choy / Asian greens: fall sowing Oct 14–28
- Arugula: fall sowing Oct 14–Nov 11
- Mustard greens: fall sowing Oct 14–28
- Cilantro: fall sowing Oct 14–28
- Dill: fall sowing Oct 14–28
- Strawberry (plants): fall transplant Sep 30–Oct 28
Coming up in the next 3 weeks
- Radish: fall sowing Oct 28–Nov 11
- Garlic: fall sowing Oct 28–Nov 25
- Shallot: fall sowing Oct 28–Nov 25
Prune now
No frost-timed pruning windows are open this week.
Your average first frost is Dec 9: skip heavy pruning in the 6–8 weeks before it, because new growth may not harden off in time.
Spring-flowering shrubs are pruned right after their flowers fade, not by date. See the pruning guide.
Last spring frost odds
| Chance of a 32°F freeze after this date | Date |
|---|---|
| 90% (early: most years still freeze after this) | Jan 18 |
| 50% (the "average" last frost) | Feb 18 |
| 10% (cautious: only 1 year in 10 freezes later) | Mar 16 |
Most gardeners plant frost-tender crops (tomatoes, peppers, basil) after the 50% date, and closer to the 10% date for less risk.
First fall frost odds
| Chance the first 32°F freeze has happened by this date | Date |
|---|---|
| 10% (early: 1 year in 10 freezes this soon) | Nov 17 |
| 50% (the "average" first frost) | Dec 9 |
| 90% (late: most years have frozen by now) | Jan 13 (next year) |
Light frost, freeze and hard freeze
| Threshold | Last spring (50%) | First fall (50%) |
|---|---|---|
| 36°F (light frost possible on clear, calm nights) | Mar 4 | Nov 25 |
| 32°F (freeze) | Feb 18 | Dec 9 |
| 28°F (hard freeze) | Jan 31 | Dec 29 |
n/a means NOAA did not publish a date at that threshold for this station (usually because it rarely gets that cold).
Vegetable planting calendar for 78250
Dates count from your average last spring frost (Feb 18) and first fall frost (Dec 9). Half of years have a frost after the spring date, so give tender crops (tomatoes, peppers, squash) some slack.
| Crop | Start indoors | Spring planting | Fall planting |
|---|---|---|---|
| Tomato | Dec 24–Jan 7 | Feb 25–Mar 11 (transplant) | Aug 12–Sep 9 (transplant) |
| Pepper (sweet and hot) | Dec 10–24 | Mar 4–18 (transplant) | Aug 19–Sep 9 (transplant) |
| Eggplant | Dec 10–24 | Mar 4–18 (transplant) | Aug 19–Sep 9 (transplant) |
| Tomatillo | Dec 24–Jan 7 | Feb 25–Mar 11 (transplant) | – |
| Lettuce | Dec 24–Jan 7 | Jan 28–Feb 18 (transplant) Jan 21–Mar 4 (sow outdoors) | Oct 14–Nov 4 (transplant) Sep 30–Oct 28 (sowing) |
| Spinach | – | Jan 7–28 (sow outdoors) | Oct 14–Nov 4 (sowing) |
| Kale | Dec 24–Jan 7 | Jan 21–Feb 4 (transplant) Jan 21–Feb 4 (sow outdoors) | Sep 16–Oct 14 (transplant) Sep 2–30 (sowing) |
| Collards | Dec 24–Jan 7 | Jan 21–Feb 18 (transplant) Jan 21–Feb 18 (sow outdoors) | Sep 16–Oct 14 (transplant) Sep 2–30 (sowing) |
| Broccoli | Dec 10–24 | Jan 21–Feb 4 (transplant) | Sep 2–30 (transplant) |
| Cabbage | Dec 10–24 | Jan 21–Feb 4 (transplant) | Sep 2–30 (transplant) |
| Cauliflower | Dec 10–24 | Feb 4–18 (transplant) | Sep 2–30 (transplant) |
| Brussels sprouts | Nov 26–Dec 10 | Jan 21–Feb 4 (transplant) | Aug 19–Sep 9 (transplant) |
| Kohlrabi | Dec 24–Jan 7 | Jan 21–Feb 4 (transplant) Jan 21–Feb 4 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Bok choy / Asian greens | – | Jan 21–Feb 4 (sow outdoors) | Oct 14–28 (sowing) |
| Arugula | – | Jan 21–Feb 18 (sow outdoors) | Oct 14–Nov 11 (sowing) |
| Mustard greens | – | Jan 21–Feb 11 (sow outdoors) | Oct 14–28 (sowing) |
| Swiss chard | Jan 7–21 | Feb 4–25 (transplant) Feb 4–Mar 4 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Beet | – | Jan 21–Feb 18 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Carrot | – | Jan 28–Feb 25 (sow outdoors) | Sep 16–30 (sowing) |
| Radish | – | Jan 14–Feb 25 (sow outdoors) | Oct 28–Nov 11 (sowing) |
| Turnip | – | Jan 21–Feb 11 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Parsnip | – | Jan 28–Feb 18 (sow outdoors) | – |
| Pea (garden, snap, snow) | – | Dec 24–Jan 21 (sow outdoors) | Sep 16–30 (sowing) |
| Onion (bulbing) | Nov 26–Dec 10 | Jan 7–21 (transplant) | – |
| Green onion / scallion | – | Jan 7–Feb 4 (sow outdoors) | Sep 30–Oct 14 (sowing) |
| Leek | Nov 26–Dec 10 | Jan 21–Feb 4 (transplant) | – |
| Garlic | – | – | Oct 28–Nov 25 (sowing) |
| Shallot | – | Jan 7–21 (transplant) | Oct 28–Nov 25 (sowing) |
| Potato | – | Jan 21–Feb 4 (transplant) | Aug 19–Sep 2 (transplant) |
| Sweet potato | – | Mar 11–25 (transplant) | – |
| Sweet corn | – | Feb 25–Mar 11 (sow outdoors) | – |
| Bean, bush (snap) | – | Feb 25–Mar 11 (sow outdoors) | Sep 16–30 (sowing) |
| Bean, pole | – | Feb 25–Mar 11 (sow outdoors) | – |
| Lima bean | – | Mar 4–18 (sow outdoors) | – |
| Southern pea (cowpea, black-eyed pea) | – | Mar 11–Apr 1 (sow outdoors) | – |
| Cucumber | Jan 21–28 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | Sep 16–30 (sowing) |
| Summer squash / zucchini | Jan 21–28 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | Sep 16–30 (sowing) |
| Winter squash | Jan 21–28 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | – |
| Pumpkin | – | Feb 25–Mar 11 (sow outdoors) | – |
| Watermelon | Jan 21–28 | Mar 4–18 (transplant) Mar 4–18 (sow outdoors) | – |
| Cantaloupe / muskmelon | Jan 21–28 | Mar 4–18 (transplant) Mar 4–18 (sow outdoors) | – |
| Okra | Jan 7–21 | Mar 4–18 (transplant) Mar 4–18 (sow outdoors) | – |
| Celery | Nov 26–Dec 10 | Feb 25–Mar 4 (transplant) | – |
| Basil | Jan 7–21 | Feb 25–Mar 11 (transplant) Feb 25–Mar 11 (sow outdoors) | – |
| Cilantro | – | Feb 4–Mar 4 (sow outdoors) | Oct 14–28 (sowing) |
| Parsley | Dec 10–24 | Feb 4–18 (transplant) Jan 28–Feb 18 (sow outdoors) | – |
| Dill | – | Feb 18–Mar 4 (sow outdoors) | Oct 14–28 (sowing) |
| Sunflower | – | Feb 18–Mar 4 (sow outdoors) | – |
| Asparagus (crowns) | – | Jan 21–Feb 4 (transplant) | – |
| Rhubarb (crowns) | – | Jan 21–Feb 4 (transplant) | – |
| Strawberry (plants) | – | Jan 21–Feb 4 (transplant) | Sep 30–Oct 28 (transplant) |
Typical ranges from university extension planting calendars, adjusted to your frost dates. Probabilities, not guarantees. Fall windows that would overlap spring planting are left out, as are fall crops of frost-tender plants where the frost-free season is under 210 days.
Plants that do well here
Texas A&M AgriLife trials name plants that handle Texas conditions: the Texas Superstar® list and the low-care roses from AgriLife trials. Plant frost-tender annuals after February 18 here (the average last frost). More on plants for Texas. Not affiliated with Texas A&M AgriLife.
Where these numbers come from
Station: San Antonio/seaworld, TX (NOAA GHCN-Daily ID USC00418169), elevation 940 ft, 4.2 miles from the ZIP's center point. NOAA completeness flag: R (representative, 10+ years).
Nearby stations
| Station | Distance | Last frost (50%) | First frost (50%) |
|---|---|---|---|
| San Antonio Kelly AFB, TX | 10 mi | Feb 22 | Dec 2 |
| San Antonio Intl AP, TX | 11 mi | Feb 26 | Nov 28 |
| San Antonio Incarnate Word, TX | 12 mi | Feb 25 | Nov 28 |
The average last-frost dates of these stations span 8 days, a rough guide to local variation. See data sources & methods.
Frost questions for 78250
When is the last frost in 78250?
The average (50% chance) last spring freeze of 32°F for ZIP 78250 is February 18. For a more cautious planting date, use March 16, when only 1 year in 10 still sees a later freeze.
When is the first frost in 78250?
The average first fall freeze is December 9. In 1 year in 10 it comes by November 17.
What hardiness zone is 78250?
ZIP 78250 is in USDA zone 9a (20 to 25°F average coldest winter night), per the 2023 USDA Plant Hardiness Zone Map ZIP listing.
What is the soil temperature in 78250 right now?
This page shows the latest 2-inch and 4-inch soil temperature from the nearest public soil station (USDA SCAN, NOAA USCRN or TexMesonet), or a labeled estimate when no station is close, against the 50–55°F spring pre-emergent band.
Nearby ZIP codes
78251 San Antonio 78238 San Antonio 78240 San Antonio 78254 San Antonio 78229 San Antonio 78249 San Antonio 78228 San Antonio 78230 San Antonio
Other ZIP codes in Bexar County
78002 78023 78073 78101 78109 78112 78148 78150 78152 78154 78201 78202 78203 78204 78205 78207 78208 78209 78210 78211 78212 78213 78214 78215 All Bexar County frost dates · Texas frost dates
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