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

Planting zone for 79543 — Roby, TX

ZIP code 79543 (Roby, Fisher County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 17 and the first fall frost November 15.

Where ZIP 79543 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 17

First frostNov 15

2012 zone7b

Was 7b on the 2012 map — half a zone warmer now. 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 Roby, 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 Roby, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 17median — 50% chance of a later frost

Safe for tender plantsApril 3only 10% chance of frost after

First fall frostNovember 15median — 10% chance by Oct 31

Growing season243 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 4 and returns around November 28.

From the NOAA station Rotan, TX — 11 miles away, elevation 1,995 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 79543

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 3 – Feb 17

SpinachSow outdoors · Feb 3 – Feb 24

Broccoli, cabbageStart indoors · Jan 6 – Jan 20

Broccoli, cabbageTransplant · Feb 24 – Mar 10

Onion setsPlant outdoors · Feb 17 – Mar 3

PotatoesPlant outdoors · Feb 24 – Mar 10

LettuceSow outdoors · Feb 17 – Mar 3

Carrots, beetsSow outdoors · Feb 24 – Mar 10

TomatoesStart indoors · Jan 20 – Feb 3

TomatoesTransplant · Mar 24 – Apr 7

Peppers, eggplantStart indoors · Jan 6 – Jan 20

Peppers, eggplantTransplant · Mar 31 – Apr 14

BeansSow outdoors · Mar 24 – Apr 7

Sweet cornSow outdoors · Mar 24 – Apr 7

Cucumbers, squashSow outdoors · Mar 24 – Apr 7

Fall lettuce, spinachSow outdoors · Sep 20 – Oct 4

GarlicPlant cloves · Nov 1 – Dec 6

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 17) and first fall frost (Nov 15) 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 79543 came on Feb 8 — about the same time as the 1991–2020 average (Feb 8).

average
Feb 82026
Feb 8

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 Roby, TX.

Soil in Roby, TX

The soil mapped at the center of ZIP 79543 is Paducah — loam, well drained.

TextureLoama good balance for most vegetables

pH7.2neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.75%low — add compost

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Paducah 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 79543; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Roby, TX

Summer high96 °Faverage high, July

Winter low34 °Faverage low, January

Hot days111days a year at 90 °F or more

Freezing nights55nights a year at 32 °F or less

Growing degree days6,368base 50 °F — the season’s usable heat

Longest day14 h 18 mindaylight on June 21

Shortest day10 h 00 mindaylight on December 21

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

Precipitation23.5 inper year, rain and melted snow

Snowfall4 inper year; 1 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Rotan, TX (11 mi away); precipitation: Rotan, TX (11 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

795348a

Mc Caulley, TX · 9 mi

795608a

Sylvester, TX · 10 mi

795468a

Rotan, TX · 13 mi

795568a

Sweetwater, TX · 16 mi

Texas planting zones →

Questions about 79543

What planting zone is ZIP code 79543?

ZIP code 79543 (Roby, 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 Roby, TX?

The median last spring frost (32 °F) near 79543 is March 17; after April 3 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Rotan station.

When is the first frost in Roby, TX?

The median first fall frost near 79543 is November 15, giving a median frost-free growing season of 243 days.

When should I plant tomatoes in 79543?

Start tomato seeds indoors around Jan 20 – Feb 3 and set transplants outside around Mar 24 – Apr 7, one to three weeks after the median last frost.

How much rain and snow does 79543 get?

About 23.5 inches of precipitation a year and 4 inches of snowfall (NOAA 1991–2020 normals, Rotan station).

How hot do summers get in Roby, TX?

The average high peaks at 96 °F in July, with about 111 days a year at 90 °F or more.

What kind of soil does 79543 have?

The USDA soil survey maps Paducah at the center of ZIP 79543: loam, well drained, pH about 7.2 (neutral).

Did spring come early in Roby, TX in 2026?

Spring leaf-out near 79543 came on Feb 8 in 2026, about the same as the 1991–2020 average (Feb 8), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Roby, TX?

Intermediate onions: the longest day near 79543 is 14 h 18 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 79543 change?

Yes. The 2012 USDA map put 79543 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.