Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 29, 2026

Planting zone for 78008 — Campbellton, TX

ZIP code 78008 (Campbellton, Atascosa County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is February 8 and the first fall frost December 6.

Where ZIP 78008 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 8

First frostDec 6

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 Campbellton, 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 Campbellton, TX

JanFebMarAprMayJunJulAugSepOctNovDec

Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free

Last spring frostFebruary 8median — 50% chance of a later frost

Safe for tender plantsMarch 8only 10% chance of frost after

First fall frostDecember 6median — 10% chance by Nov 17

Growing season302 daysfrost-free, median

A hard freeze (28 °F) usually ends around January 23 and returns around December 25.

From the NOAA station Choke Canyon Dam, TX — 18 miles away, elevation 230 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 78008

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Dec 28 – Jan 11

SpinachSow outdoors · Dec 28 – Jan 18

Broccoli, cabbageStart indoors · Nov 30 – Dec 14

Broccoli, cabbageTransplant · Jan 18 – Feb 1

Onion setsPlant outdoors · Jan 11 – Jan 25

PotatoesPlant outdoors · Jan 18 – Feb 1

LettuceSow outdoors · Jan 11 – Jan 25

Carrots, beetsSow outdoors · Jan 18 – Feb 1

TomatoesStart indoors · Dec 14 – Dec 28

TomatoesTransplant · Feb 15 – Mar 1

Peppers, eggplantStart indoors · Nov 30 – Dec 14

Peppers, eggplantTransplant · Feb 22 – Mar 8

BeansSow outdoors · Feb 15 – Mar 1

Sweet cornSow outdoors · Feb 15 – Mar 1

Cucumbers, squashSow outdoors · Feb 15 – Mar 1

Fall lettuce, spinachSow outdoors · Oct 11 – Oct 25

GarlicPlant cloves · Nov 22 – Dec 27

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Feb 8) and first fall frost (Dec 6) 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 78008 came on Jan 15 — 8 days earlier than the 1991–2020 average (Jan 23).

average
Jan 232026
Jan 15

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).

Native plants for zone 9a in Texas

640 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 20 °F or colder — the bottom of zone 9a. Each links to its USDA PLANTS profile.

Source: USDA, NRCS. 2026. The PLANTS Database (plants.usda.gov), National Plant Data Team — state distribution, native status and the “Temperature, Minimum” characteristic. Check light, moisture and soil needs before buying; local nurseries and your state native plant society can confirm what thrives in Campbellton, TX.

Soil in Campbellton, TX

The soil mapped at the center of ZIP 78008 is Weigang — sandy clay loam, well drained.

TextureSandy clay loamholds water and nutrients; slow to drain and warm up

pH7.0neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Weigang-Picosa complex, 1 to 20 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 78008; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Campbellton, TX

Summer high97 °Faverage high, August

Winter low43 °Faverage low, January

Hot days138days a year at 90 °F or more

Freezing nights9nights a year at 32 °F or less

Growing degree days7,702base 50 °F — the season’s usable heat

Longest day13 h 59 mindaylight on June 21

Shortest day10 h 19 mindaylight on December 21

Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb

Precipitation29 inper year, rain and melted snow

Average high and low, by month

Precipitation by month inches

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Choke Canyon Dam, TX (18 mi away); precipitation: Whitsett, TX (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

Christine, TX · 12 mi

781139a

Falls City, TX · 17 mi

780649a

Pleasanton, TX · 17 mi

780719a

Three Rivers, TX · 18 mi

780269a

Jourdanton, TX · 18 mi

780079b

Calliham, TX · 20 mi

Texas planting zones →

Questions about 78008

What planting zone is ZIP code 78008?

ZIP code 78008 (Campbellton, 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 Campbellton, TX?

The median last spring frost (32 °F) near 78008 is February 8; after March 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Choke Canyon Dam station.

When is the first frost in Campbellton, TX?

The median first fall frost near 78008 is December 6, giving a median frost-free growing season of 302 days.

When should I plant tomatoes in 78008?

Start tomato seeds indoors around Dec 14 – Dec 28 and set transplants outside around Feb 15 – Mar 1, one to three weeks after the median last frost.

How much rain and snow does 78008 get?

About 29 inches of precipitation a year (NOAA 1991–2020 normals, Whitsett station).

How hot do summers get in Campbellton, TX?

The average high peaks at 97 °F in August, with about 138 days a year at 90 °F or more.

What kind of soil does 78008 have?

The USDA soil survey maps Weigang at the center of ZIP 78008: sandy clay loam, well drained, pH about 7.0 (neutral).

Did spring come early in Campbellton, TX in 2026?

Spring leaf-out near 78008 came on Jan 15 in 2026, 8 days earlier than the 1991–2020 average (Jan 23), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Campbellton, TX?

Short-day onions: the longest day near 78008 is 13 h 59 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.