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

Planting zone for 76233 — Collinsville, TX

ZIP code 76233 (Collinsville, Grayson County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 19 and the first fall frost November 14.

Where ZIP 76233 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.

Zone8a10 to 15 °F

Coldest night−12.2 to −9.4 °C

Last frostMar 19

First frostNov 14

2012 zone8a

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 8a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Collinsville, 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 Collinsville, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 19median — 50% chance of a later frost

Safe for tender plantsApril 6only 10% chance of frost after

First fall frostNovember 14median — 10% chance by Oct 31

Growing season242 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 5 and returns around November 28.

From the NOAA station Gainesville 5 Ene, TX — 12 miles away, elevation 869 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 76233

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 5 – Feb 19

SpinachSow outdoors · Feb 5 – Feb 26

Broccoli, cabbageStart indoors · Jan 8 – Jan 22

Broccoli, cabbageTransplant · Feb 26 – Mar 12

Onion setsPlant outdoors · Feb 19 – Mar 5

PotatoesPlant outdoors · Feb 26 – Mar 12

LettuceSow outdoors · Feb 19 – Mar 5

Carrots, beetsSow outdoors · Feb 26 – Mar 12

TomatoesStart indoors · Jan 22 – Feb 5

TomatoesTransplant · Mar 26 – Apr 9

Peppers, eggplantStart indoors · Jan 8 – Jan 22

Peppers, eggplantTransplant · Apr 2 – Apr 16

BeansSow outdoors · Mar 26 – Apr 9

Sweet cornSow outdoors · Mar 26 – Apr 9

Cucumbers, squashSow outdoors · Mar 26 – Apr 9

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 19) 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 76233 came on Feb 9 — about the same time as the 1991–2020 average (Feb 10).

average
Feb 102026
Feb 9

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 8a in Texas

601 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 10 °F or colder — the bottom of zone 8a. 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 Collinsville, TX.

Soil in Collinsville, TX

The soil mapped at the center of ZIP 76233 is Mabank — loam, moderately well drained.

TextureLoama good balance for most vegetables

pH6.5neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classFarmland of statewide importanceUSDA classification

Map unit: Mabank loam, 0 to 1 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 76233; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Collinsville, TX

Summer high94 °Faverage high, July

Winter low32 °Faverage low, January

Hot days82days a year at 90 °F or more

Freezing nights50nights a year at 32 °F or less

Growing degree days5,701base 50 °F — the season’s usable heat

Longest day14 h 23 mindaylight on June 21

Shortest day9 h 55 mindaylight on December 21

Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully

Precipitation42.8 inper year, rain and melted snow

Snowfall3 inper year

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Gainesville 5 Ene, TX (12 mi away); precipitation: Gainesville 5 Ene, TX (12 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

762718a

Tioga, TX · 5 mi

762688a

Southmayd, TX · 10 mi

750588a

Gunter, TX · 11 mi

762588a

Pilot Point, TX · 12 mi

Whitesboro, TX · 14 mi

762648a

Sadler, TX · 15 mi

Texas planting zones →

Questions about 76233

What planting zone is ZIP code 76233?

ZIP code 76233 (Collinsville, TX) is in USDA hardiness zone 8a on the 2023 map: the coldest night of an average winter reaches 10 to 15 °F (−12.2 to −9.4 °C).

When is the last frost in Collinsville, TX?

The median last spring frost (32 °F) near 76233 is March 19; after April 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Gainesville 5 Ene station.

When is the first frost in Collinsville, TX?

The median first fall frost near 76233 is November 14, giving a median frost-free growing season of 242 days.

When should I plant tomatoes in 76233?

Start tomato seeds indoors around Jan 22 – Feb 5 and set transplants outside around Mar 26 – Apr 9, one to three weeks after the median last frost.

How much rain and snow does 76233 get?

About 42.8 inches of precipitation a year and 3 inches of snowfall (NOAA 1991–2020 normals, Gainesville 5 Ene station).

How hot do summers get in Collinsville, TX?

The average high peaks at 94 °F in July, with about 82 days a year at 90 °F or more.

What kind of soil does 76233 have?

The USDA soil survey maps Mabank at the center of ZIP 76233: loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Collinsville, TX in 2026?

Spring leaf-out near 76233 came on Feb 9 in 2026, about the same as the 1991–2020 average (Feb 10), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Collinsville, TX?

Intermediate onions: the longest day near 76233 is 14 h 23 min, so day-neutral types bulb best; long-day varieties may not bulb fully.