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

Planting zone for Del Rio, TX

Del Rio, TX is in USDA zones 8b to 9a across its 4 ZIP codes. The median last spring frost is March 4 and the first fall frost November 20.

Del Rio on the zone map

Outlined: its 3 ZIP code areas · 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.

Zones8b–9a15 to 25 °F

ZIP codes4

Last frostMar 4

First frostNov 20

Growing season258 days

8b 2 ZIPs 9a 2 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Del Rio, 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 Del Rio, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 4median — 50% chance of a later frost

Safe for tender plantsMarch 31only 10% chance of frost after

First fall frostNovember 20median — 10% chance by Nov 2

Growing season258 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 20 and returns around December 2.

From the NOAA station Carta Valley, TX, elevation 1,850 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 Del Rio

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 21 – Feb 4

SpinachSow outdoors · Jan 21 – Feb 11

Broccoli, cabbageStart indoors · Dec 24 – Jan 7

Broccoli, cabbageTransplant · Feb 11 – Feb 25

Onion setsPlant outdoors · Feb 4 – Feb 18

PotatoesPlant outdoors · Feb 11 – Feb 25

LettuceSow outdoors · Feb 4 – Feb 18

Carrots, beetsSow outdoors · Feb 11 – Feb 25

TomatoesStart indoors · Jan 7 – Jan 21

TomatoesTransplant · Mar 11 – Mar 25

Peppers, eggplantStart indoors · Dec 24 – Jan 7

Peppers, eggplantTransplant · Mar 18 – Apr 1

BeansSow outdoors · Mar 11 – Mar 25

Sweet cornSow outdoors · Mar 11 – Mar 25

Cucumbers, squashSow outdoors · Mar 11 – Mar 25

Fall lettuce, spinachSow outdoors · Sep 25 – Oct 9

GarlicPlant cloves · Nov 6 – Dec 11

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 4) and first fall frost (Nov 20) 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 78842 came on Feb 1 — 5 days later than the 1991–2020 average (Jan 27).

average
Jan 272026
Feb 1

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 8b in Texas

620 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. 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 Del Rio, TX.

Soil in Del Rio, TX

The soil mapped at the center of ZIP 78842 is Zorra — very stony loam, well drained.

TextureVery stony loama good balance for most vegetables

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter3%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Zorra-Rock outcrop complex, 8 to 15 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 78842; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Del Rio, TX

Summer high97 °Faverage high, July

Winter low40 °Faverage low, January

Hot days138days a year at 90 °F or more

Freezing nights12nights a year at 32 °F or less

Growing degree days7,369base 50 °F — the season’s usable heat

Longest day14 h 03 mindaylight on June 21

Shortest day10 h 14 mindaylight on December 21

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

Precipitation19.4 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: Amistad Dam, TX (12 mi away); precipitation: Amistad Dam, TX (12 mi away). Daylight is calculated from latitude.

ZIP codes in Del Rio

Texas planting zones →

Questions about Del Rio

What planting zone is Del Rio, TX?

Del Rio, TX is in USDA hardiness zones 8b to 9a on the 2023 map (8b: 15 to 20 °F; 9a: 20 to 25 °F).

When is the last frost in Del Rio, TX?

The median last spring frost is March 4 and the median first fall frost is November 20 (NOAA 1991–2020 normals, Carta Valley station).

When can I plant a garden in Del Rio, TX?

Cool-season crops like peas and spinach go in around Jan 21 – Feb 11; tomatoes, peppers, beans and squash after about Mar 11, once frost risk has passed.

What kind of onions grow in Del Rio, TX?

Short-day onions: the longest day is 14 h 03 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

How much rain and snow does Del Rio, TX get?

About 19.4 inches of precipitation a year (NOAA 1991–2020 normals).