Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated

Planting zone for 78264 — San Antonio, TX

ZIP code 78264 (San Antonio, Bexar County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 20 and the first fall frost December 3.

Where ZIP 78264 is

Outlined: the ZIP code area · tap the map for the zone at any spot · scroll or pinch to zoom

Not the official USDA Plant Hardiness Zone Map. Zones come from the 2023 USDA hardiness-zone data by the PRISM Group, Oregon State University; we re-mapped and recolored them. The official map is at planthardiness.ars.usda.gov.

Zone9a20 to 25 °F
Coldest night−6.7 to −3.9 °C
Last frostFeb 20
First frostDec 3
2012 zone9a

Same zone as on the 2012 map. The zone is the one at the center of the ZIP code; hilly ZIPs can span two zones. What zone 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for San Antonio, TX…

Forecast data: National Weather Service (api.weather.gov), public domain. This is not a warning service — for official frost and freeze warnings see weather.gov.

Frost dates in San Antonio, TX

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostFebruary 20median — 50% chance of a later frost
Safe for tender plantsMarch 13only 10% chance of frost after
First fall frostDecember 3median — 10% chance by Nov 12
Growing season291 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 30 and returns around December 23.

From the NOAA station San Antonio Stinson Airport, TX — 10 miles away, elevation 571 ft. NOAA NCEI U.S. Climate Normals 1991–2020, 32 °F threshold. Low spots and valleys can freeze later in spring than the station.

When to plant vegetables in 78264

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 9 – Jan 23
SpinachSow outdoors · Jan 9 – Jan 30
Broccoli, cabbageStart indoors · Dec 12 – Dec 26
Broccoli, cabbageTransplant · Jan 30 – Feb 13
Onion setsPlant outdoors · Jan 23 – Feb 6
PotatoesPlant outdoors · Jan 30 – Feb 13
LettuceSow outdoors · Jan 23 – Feb 6
Carrots, beetsSow outdoors · Jan 30 – Feb 13
TomatoesStart indoors · Dec 26 – Jan 9
TomatoesTransplant · Feb 27 – Mar 13
Peppers, eggplantStart indoors · Dec 12 – Dec 26
Peppers, eggplantTransplant · Mar 6 – Mar 20
BeansSow outdoors · Feb 27 – Mar 13
Sweet cornSow outdoors · Feb 27 – Mar 13
Cucumbers, squashSow outdoors · Feb 27 – Mar 13
Fall lettuce, spinachSow outdoors · Oct 8 – Oct 22
GarlicPlant cloves · Nov 19 – Dec 24
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 20) and first fall frost (Dec 3) with the rules of thumb U.S. extension services publish. Cool-season crops take a light frost; warm-season crops do best once the soil is above about 60 °F.

When spring arrived in 2026

In 2026, spring leaf-out near 78264 came on Jan 15 — 9 days earlier than the 1991–2020 average (Jan 24).

JanFebMarAprMayJun

The Spring Index marks the day when accumulated warmth is enough for lilac and honeysuckle to leaf out — a widely used signal that the growing season has started. Source: USA National Phenology Network, www.usanpn.org — Spring Indices, first leaf, 2026 (data as of 2026-09-08) and 30-year average 1991–2020 (CC BY 4.0).

Soil in San Antonio, TX

The soil mapped at the center of ZIP 78264 is Aluf — fine sand, somewhat excessively drained.

TextureFine sanddrains and warms fast; dries out and needs more feeding
pH6.5neutral; most vegetables like 6.0–7.0
DrainageSomewhat excessively drainednatural drainage class
Organic matter0.75%low — add compost
Hydrologic groupAwater soaks in fast
Farmland classFarmland of statewide importanceUSDA classification

Map unit: Aluf sand, 0 to 5 percent slopes.

Soil Survey Staff, Natural Resources Conservation Service, USDA. Soil Survey Geographic (SSURGO) Database, via Soil Data Access, accessed 2026-10-29. The soil at the center point of ZIP 78264; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in San Antonio, TX

Summer high98 °Faverage high, August
Winter low42 °Faverage low, January
Hot days134days a year at 90 °F or more
Freezing nights14nights a year at 32 °F or less
Growing degree days7,858base 50 °F — the season’s usable heat
Longest day14 h 01 mindaylight on June 21
Shortest day10 h 16 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation32.2 inper year, rain and melted snow

Average high and low, by month

30°40°50°60°70°80°90°100°110°32 °FJanuary: average high 65 °F, low 42 °F 65°42° JanFebruary: average high 69 °F, low 47 °F 69°47° FebMarch: average high 75 °F, low 54 °F 75°54° MarApril: average high 82 °F, low 60 °F 82°60° AprMay: average high 88 °F, low 68 °F 88°68° MayJune: average high 94 °F, low 74 °F 94°74° JunJuly: average high 96 °F, low 75 °F 96°75° JulAugust: average high 98 °F, low 76 °F 98°76° AugSeptember: average high 91 °F, low 71 °F 91°71° SepOctober: average high 84 °F, low 62 °F 84°62° OctNovember: average high 73 °F, low 51 °F 73°51° NovDecember: average high 66 °F, low 44 °F 66°44° Dec

Precipitation by month inches

0″1″2″3″4″5″January: 1.88 in precipitation 1.9 JanFebruary: 1.63 in precipitation 1.6 FebMarch: 2.26 in precipitation 2.3 MarApril: 2.50 in precipitation 2.5 AprMay: 4.83 in precipitation 4.8 MayJune: 3.51 in precipitation 3.5 JunJuly: 2.36 in precipitation 2.4 JulAugust: 2.22 in precipitation 2.2 AugSeptember: 3.96 in precipitation 4.0 SepOctober: 2.94 in precipitation 2.9 OctNovember: 2.09 in precipitation 2.1 NovDecember: 1.98 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: San Antonio Stinson Airport, TX (10 mi away); precipitation: Poteet 4.1 Ene, TX (9 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

782219a
San Antonio, TX · 7 mi
781129a
Elmendorf, TX · 7 mi
780739a
Von Ormy, TX · 7 mi
780509a
Leming, TX · 8 mi
782249a
San Antonio, TX · 8 mi
780699a
Somerset, TX · 10 mi
782119a
San Antonio, TX · 10 mi
782149a
San Antonio, TX · 10 mi

All 82 ZIP codes in San Antonio → · Texas planting zones →

Questions about 78264

What planting zone is ZIP code 78264?

ZIP code 78264 (San Antonio, TX) is in USDA hardiness zone 9a on the 2023 map: the coldest night of an average winter reaches 20 to 25 °F (−6.7 to −3.9 °C).

When is the last frost in San Antonio, TX?

The median last spring frost (32 °F) near 78264 is February 20; after March 13 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, San Antonio Stinson Airport station.

When is the first frost in San Antonio, TX?

The median first fall frost near 78264 is December 3, giving a median frost-free growing season of 291 days.

When should I plant tomatoes in 78264?

Start tomato seeds indoors around Dec 26 – Jan 9 and set transplants outside around Feb 27 – Mar 13, one to three weeks after the median last frost.

How much rain and snow does 78264 get?

About 32.2 inches of precipitation a year (NOAA 1991–2020 normals, Poteet 4.1 Ene station).

How hot do summers get in San Antonio, TX?

The average high peaks at 98 °F in August, with about 134 days a year at 90 °F or more.

What kind of soil does 78264 have?

The USDA soil survey maps Aluf at the center of ZIP 78264: fine sand, somewhat excessively drained, pH about 6.5 (neutral).

Did spring come early in San Antonio, TX in 2026?

Spring leaf-out near 78264 came on Jan 15 in 2026, 9 days earlier than the 1991–2020 average (Jan 24), according to the USA National Phenology Network Spring Index.

What kind of onions grow in San Antonio, TX?

Short-day onions: the longest day near 78264 is 14 h 01 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.