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

Planting zone for 79748 — Knott, TX

ZIP code 79748 (Knott, Howard County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 20 and the first fall frost November 13.

Where ZIP 79748 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 20

First frostNov 13

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 Knott, 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 Knott, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 20median — 50% chance of a later frost

Safe for tender plantsApril 7only 10% chance of frost after

First fall frostNovember 13median — 10% chance by Oct 31

Growing season239 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 6 and returns around November 24.

From the NOAA station Big Spring, TX — 16 miles away, elevation 2,510 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 79748

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 6 – Feb 20

SpinachSow outdoors · Feb 6 – Feb 27

Broccoli, cabbageStart indoors · Jan 9 – Jan 23

Broccoli, cabbageTransplant · Feb 27 – Mar 13

Onion setsPlant outdoors · Feb 20 – Mar 6

PotatoesPlant outdoors · Feb 27 – Mar 13

LettuceSow outdoors · Feb 20 – Mar 6

Carrots, beetsSow outdoors · Feb 27 – Mar 13

TomatoesStart indoors · Jan 23 – Feb 6

TomatoesTransplant · Mar 27 – Apr 10

Peppers, eggplantStart indoors · Jan 9 – Jan 23

Peppers, eggplantTransplant · Apr 3 – Apr 17

BeansSow outdoors · Mar 27 – Apr 10

Sweet cornSow outdoors · Mar 27 – Apr 10

Cucumbers, squashSow outdoors · Mar 27 – Apr 10

Fall lettuce, spinachSow outdoors · Sep 18 – Oct 2

GarlicPlant cloves · Oct 30 – Dec 4

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 20) and first fall frost (Nov 13) 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 79748 came on Feb 8 — about the same time as the 1991–2020 average (Feb 7).

average
Feb 72026
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).

Soil in Knott, TX

The soil mapped at the center of ZIP 79748 is Acuff — loam, well drained.

TextureLoama good balance for most vegetables

pH7.2neutral; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupBwater soaks in moderately

Farmland classprime farmlandUSDA classification

Map unit: Acuff 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 79748; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Knott, TX

Summer high96 °Faverage high, July

Winter low31 °Faverage low, January

Hot days115days a year at 90 °F or more

Freezing nights54nights a year at 32 °F or less

Growing degree days6,091base 50 °F — the season’s usable heat

Longest day14 h 17 mindaylight on June 21

Shortest day10 h 01 mindaylight on December 21

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

Precipitation19.1 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: Big Spring, TX (16 mi away); precipitation: Big Spring Field Stn, TX (14 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

Big Spring, TX · 14 mi

797208a

Big Spring, TX · 16 mi

Texas planting zones →

Questions about 79748

What planting zone is ZIP code 79748?

ZIP code 79748 (Knott, 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 Knott, TX?

The median last spring frost (32 °F) near 79748 is March 20; after April 7 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Big Spring station.

When is the first frost in Knott, TX?

The median first fall frost near 79748 is November 13, giving a median frost-free growing season of 239 days.

When should I plant tomatoes in 79748?

Start tomato seeds indoors around Jan 23 – Feb 6 and set transplants outside around Mar 27 – Apr 10, one to three weeks after the median last frost.

How much rain and snow does 79748 get?

About 19.1 inches of precipitation a year (NOAA 1991–2020 normals, Big Spring Field Stn station).

How hot do summers get in Knott, TX?

The average high peaks at 96 °F in July, with about 115 days a year at 90 °F or more.

What kind of soil does 79748 have?

The USDA soil survey maps Acuff at the center of ZIP 79748: loam, well drained, pH about 7.2 (neutral).

Did spring come early in Knott, TX in 2026?

Spring leaf-out near 79748 came on Feb 8 in 2026, about the same as the 1991–2020 average (Feb 7), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Knott, TX?

Short-day onions: the longest day near 79748 is 14 h 17 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 79748 change?

Yes. The 2012 USDA map put 79748 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.