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

Planting zone for 77834 — Brenham, TX

ZIP code 77834 (Brenham, Washington County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 2 and the first fall frost November 30.

Where ZIP 77834 is

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 frostMar 2

First frostNov 30

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 Brenham, 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 Brenham, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 2median — 50% chance of a later frost

Safe for tender plantsMarch 20only 10% chance of frost after

First fall frostNovember 30median — 10% chance by Nov 8

Growing season273 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 10 and returns around December 18.

From the NOAA station Brenham, TX — within 1 mile, elevation 312 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 77834

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 19 – Feb 2

SpinachSow outdoors · Jan 19 – Feb 9

Broccoli, cabbageStart indoors · Dec 22 – Jan 5

Broccoli, cabbageTransplant · Feb 9 – Feb 23

Onion setsPlant outdoors · Feb 2 – Feb 16

PotatoesPlant outdoors · Feb 9 – Feb 23

LettuceSow outdoors · Feb 2 – Feb 16

Carrots, beetsSow outdoors · Feb 9 – Feb 23

TomatoesStart indoors · Jan 5 – Jan 19

TomatoesTransplant · Mar 9 – Mar 23

Peppers, eggplantStart indoors · Dec 22 – Jan 5

Peppers, eggplantTransplant · Mar 16 – Mar 30

BeansSow outdoors · Mar 9 – Mar 23

Sweet cornSow outdoors · Mar 9 – Mar 23

Cucumbers, squashSow outdoors · Mar 9 – Mar 23

Fall lettuce, spinachSow outdoors · Oct 5 – Oct 19

GarlicPlant cloves · Nov 16 – Dec 21

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 2) and first fall frost (Nov 30) 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 77834 came on Jan 15 — 11 days earlier than the 1991–2020 average (Jan 26).

average
Jan 262026
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 Brenham, TX.

Soil in Brenham, TX

The soil mapped at the center of ZIP 77834 is Klump — loamy sand, well drained.

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

pH6.7neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Klump loamy sand, 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 77834; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Brenham, TX

Summer high95 °Faverage high, August

Winter low40 °Faverage low, January

Hot days112days a year at 90 °F or more

Freezing nights18nights a year at 32 °F or less

Growing degree days6,914base 50 °F — the season’s usable heat

Longest day14 h 05 mindaylight on June 21

Shortest day10 h 12 mindaylight on December 21

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

Precipitation48 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: Brenham, TX (within 1 mile); precipitation: Brenham, TX (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

778339a

Brenham, TX · 3 mi

774269a

Chappell Hill, TX · 9 mi

789319a

Bleiblerville, TX · 9 mi

Washington, TX · 15 mi

774189a

Bellville, TX · 15 mi

All 2 ZIP codes in Brenham → · Texas planting zones →

Questions about 77834

What planting zone is ZIP code 77834?

ZIP code 77834 (Brenham, 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 Brenham, TX?

The median last spring frost (32 °F) near 77834 is March 2; after March 20 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Brenham station.

When is the first frost in Brenham, TX?

The median first fall frost near 77834 is November 30, giving a median frost-free growing season of 273 days.

When should I plant tomatoes in 77834?

Start tomato seeds indoors around Jan 5 – Jan 19 and set transplants outside around Mar 9 – Mar 23, one to three weeks after the median last frost.

How much rain and snow does 77834 get?

About 48 inches of precipitation a year (NOAA 1991–2020 normals, Brenham station).

How hot do summers get in Brenham, TX?

The average high peaks at 95 °F in August, with about 112 days a year at 90 °F or more.

What kind of soil does 77834 have?

The USDA soil survey maps Klump at the center of ZIP 77834: loamy sand, well drained, pH about 6.7 (neutral).

Did spring come early in Brenham, TX in 2026?

Spring leaf-out near 77834 came on Jan 15 in 2026, 11 days earlier than the 1991–2020 average (Jan 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Brenham, TX?

Short-day onions: the longest day near 77834 is 14 h 05 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.