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

Planting zone for 75789 — Troup, TX

ZIP code 75789 (Troup, Smith County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 22 and the first fall frost November 14.

Where ZIP 75789 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.

Zone8b15 to 20 °F

Coldest night−9.4 to −6.7 °C

Last frostMar 22

First frostNov 14

2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Troup, 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 Troup, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 22median — 50% chance of a later frost

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

First fall frostNovember 14median — 10% chance by Oct 30

Growing season239 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 8 and returns around November 28.

From the NOAA station Jacksonville, TX — 15 miles away, elevation 561 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 75789

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 8 – Feb 22

SpinachSow outdoors · Feb 8 – Mar 1

Broccoli, cabbageStart indoors · Jan 11 – Jan 25

Broccoli, cabbageTransplant · Mar 1 – Mar 15

Onion setsPlant outdoors · Feb 22 – Mar 8

PotatoesPlant outdoors · Mar 1 – Mar 15

LettuceSow outdoors · Feb 22 – Mar 8

Carrots, beetsSow outdoors · Mar 1 – Mar 15

TomatoesStart indoors · Jan 25 – Feb 8

TomatoesTransplant · Mar 29 – Apr 12

Peppers, eggplantStart indoors · Jan 11 – Jan 25

Peppers, eggplantTransplant · Apr 5 – Apr 19

BeansSow outdoors · Mar 29 – Apr 12

Sweet cornSow outdoors · Mar 29 – Apr 12

Cucumbers, squashSow outdoors · Mar 29 – Apr 12

Fall lettuce, spinachSow outdoors · Sep 19 – Oct 3

GarlicPlant cloves · Oct 31 – Dec 5

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 22) and first fall frost (Nov 14) 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 75789 came on Feb 3 — about the same time as the 1991–2020 average (Feb 3).

average
Feb 32026
Feb 3

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 Troup, TX.

Soil in Troup, TX

The soil mapped at the center of ZIP 75789 is Darco — loamy fine sand, somewhat excessively drained.

TextureLoamy fine sanddrains and warms fast; dries out and needs more feeding

pH5.5moderately acidic; most vegetables like 6.0–7.0

DrainageSomewhat excessively drainednatural drainage class

Organic matter0.6%low — add compost

Hydrologic groupAwater soaks in fast

Farmland classNot prime farmlandUSDA classification

Map unit: Darco loamy fine sand, 3 to 8 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 75789; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Troup, TX

Summer high94 °Faverage high, July

Winter low34 °Faverage low, January

Hot days96days a year at 90 °F or more

Freezing nights37nights a year at 32 °F or less

Growing degree days6,047base 50 °F — the season’s usable heat

Longest day14 h 15 mindaylight on June 21

Shortest day10 h 03 mindaylight on December 21

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

Precipitation45.3 inper year, rain and melted snow

Snowfall1 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Jacksonville, TX (15 mi away); precipitation: New Summerfield 2w, TX (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

756878b

Price, TX · 8 mi

757808b

New Summerfield, TX · 8 mi

756898b

Selman City, TX · 9 mi

757918b

Whitehouse, TX · 11 mi

757508b

Arp, TX · 11 mi

756588b

Joinerville, TX · 12 mi

756828b

New London, TX · 13 mi

757078b

Tyler, TX · 14 mi

Texas planting zones →

Questions about 75789

What planting zone is ZIP code 75789?

ZIP code 75789 (Troup, TX) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Troup, TX?

The median last spring frost (32 °F) near 75789 is March 22; after April 8 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Jacksonville station.

When is the first frost in Troup, TX?

The median first fall frost near 75789 is November 14, giving a median frost-free growing season of 239 days.

When should I plant tomatoes in 75789?

Start tomato seeds indoors around Jan 25 – Feb 8 and set transplants outside around Mar 29 – Apr 12, one to three weeks after the median last frost.

How much rain and snow does 75789 get?

About 45.3 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, New Summerfield 2w station).

How hot do summers get in Troup, TX?

The average high peaks at 94 °F in July, with about 96 days a year at 90 °F or more.

What kind of soil does 75789 have?

The USDA soil survey maps Darco at the center of ZIP 75789: loamy fine sand, somewhat excessively drained, pH about 5.5 (moderately acidic).

Did spring come early in Troup, TX in 2026?

Spring leaf-out near 75789 came on Feb 3 in 2026, about the same as the 1991–2020 average (Feb 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Troup, TX?

Short-day onions: the longest day near 75789 is 14 h 15 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.