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

Planting zone for 75421 — Brookston, TX

ZIP code 75421 (Brookston, Lamar County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 14 and the first fall frost November 16.

Where ZIP 75421 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 14

First frostNov 16

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 Brookston, 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 Brookston, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 14median — 50% chance of a later frost

Safe for tender plantsApril 2only 10% chance of frost after

First fall frostNovember 16median — 10% chance by Nov 1

Growing season247 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 1 and returns around December 1.

From the NOAA station Paris, TX — 10 miles away, elevation 541 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 75421

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 31 – Feb 14

SpinachSow outdoors · Jan 31 – Feb 21

Broccoli, cabbageStart indoors · Jan 3 – Jan 17

Broccoli, cabbageTransplant · Feb 21 – Mar 7

Onion setsPlant outdoors · Feb 14 – Feb 28

PotatoesPlant outdoors · Feb 21 – Mar 7

LettuceSow outdoors · Feb 14 – Feb 28

Carrots, beetsSow outdoors · Feb 21 – Mar 7

TomatoesStart indoors · Jan 17 – Jan 31

TomatoesTransplant · Mar 21 – Apr 4

Peppers, eggplantStart indoors · Jan 3 – Jan 17

Peppers, eggplantTransplant · Mar 28 – Apr 11

BeansSow outdoors · Mar 21 – Apr 4

Sweet cornSow outdoors · Mar 21 – Apr 4

Cucumbers, squashSow outdoors · Mar 21 – Apr 4

Fall lettuce, spinachSow outdoors · Sep 21 – Oct 5

GarlicPlant cloves · Nov 2 – Dec 7

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 14) and first fall frost (Nov 16) 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 75421 came on Feb 10 — about the same time as the 1991–2020 average (Feb 11).

average
Feb 112026
Feb 10

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 Brookston, TX.

Soil in Brookston, TX

The soil mapped at the center of ZIP 75421 is Parisian — silt loam, moderately well drained.

TextureSilt loama good balance for most vegetables

pH6.5neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter2%moderate

Hydrologic groupDwater soaks in very slowly

Farmland classprime farmlandUSDA classification

Map unit: Parisian silt loam, 1 to 3 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 75421; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brookston, TX

Summer high96 °Faverage high, July

Winter low33 °Faverage low, January

Hot days96days a year at 90 °F or more

Freezing nights46nights a year at 32 °F or less

Growing degree days6,223base 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

Precipitation48.9 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: Paris, TX (10 mi away); precipitation: Paris, TX (10 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

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

Honey Grove, TX · 10 mi

754628b

Paris, TX · 14 mi

754158b

Ben Franklin, TX · 14 mi

Texas planting zones →

Questions about 75421

What planting zone is ZIP code 75421?

ZIP code 75421 (Brookston, 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 Brookston, TX?

The median last spring frost (32 °F) near 75421 is March 14; after April 2 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Paris station.

When is the first frost in Brookston, TX?

The median first fall frost near 75421 is November 16, giving a median frost-free growing season of 247 days.

When should I plant tomatoes in 75421?

Start tomato seeds indoors around Jan 17 – Jan 31 and set transplants outside around Mar 21 – Apr 4, one to three weeks after the median last frost.

How much rain and snow does 75421 get?

About 48.9 inches of precipitation a year (NOAA 1991–2020 normals, Paris station).

How hot do summers get in Brookston, TX?

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

What kind of soil does 75421 have?

The USDA soil survey maps Parisian at the center of ZIP 75421: silt loam, moderately well drained, pH about 6.5 (neutral).

Did spring come early in Brookston, TX in 2026?

Spring leaf-out near 75421 came on Feb 10 in 2026, about the same as the 1991–2020 average (Feb 11), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brookston, TX?

Intermediate onions: the longest day near 75421 is 14 h 23 min, so day-neutral types bulb best; long-day varieties may not bulb fully.