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

Planting zone for 78949 — Muldoon, TX

ZIP code 78949 (Muldoon, Fayette County) is in USDA zone 9a: the coldest winter night averages 20 to 25 °F. The median last spring frost is March 12 and the first fall frost November 19.

Where ZIP 78949 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.

Zone9a20 to 25 °F

Coldest night−6.7 to −3.9 °C

Last frostMar 12

First frostNov 19

2012 zone8b

Was 8b 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 9a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Muldoon, 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 Muldoon, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 12median — 50% chance of a later frost

Safe for tender plantsApril 11only 10% chance of frost after

First fall frostNovember 19median — 10% chance by Nov 1

Growing season251 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 26 and returns around December 3.

From the NOAA station Smithville, TX — 12 miles away, elevation 318 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 78949

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 29 – Feb 12

SpinachSow outdoors · Jan 29 – Feb 19

Broccoli, cabbageStart indoors · Jan 1 – Jan 15

Broccoli, cabbageTransplant · Feb 19 – Mar 5

Onion setsPlant outdoors · Feb 12 – Feb 26

PotatoesPlant outdoors · Feb 19 – Mar 5

LettuceSow outdoors · Feb 12 – Feb 26

Carrots, beetsSow outdoors · Feb 19 – Mar 5

TomatoesStart indoors · Jan 15 – Jan 29

TomatoesTransplant · Mar 19 – Apr 2

Peppers, eggplantStart indoors · Jan 1 – Jan 15

Peppers, eggplantTransplant · Mar 26 – Apr 9

BeansSow outdoors · Mar 19 – Apr 2

Sweet cornSow outdoors · Mar 19 – Apr 2

Cucumbers, squashSow outdoors · Mar 19 – Apr 2

Fall lettuce, spinachSow outdoors · Sep 24 – Oct 8

GarlicPlant cloves · Nov 5 – Dec 10

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 12) and first fall frost (Nov 19) 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 78949 came on Jan 15 — 10 days earlier than the 1991–2020 average (Jan 25).

average
Jan 252026
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 Muldoon, TX.

Soil in Muldoon, TX

The soil mapped at the center of ZIP 78949 is Cadell — very fine sandy loam, moderately well drained.

TextureVery fine sandy loamdrains and warms fast; dries out and needs more feeding

pH6.7neutral; most vegetables like 6.0–7.0

DrainageModerately well drainednatural drainage class

Organic matter1.25%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Cadell very fine sandy 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 78949; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Muldoon, TX

Summer high97 °Faverage high, August

Winter low39 °Faverage low, January

Hot days124days a year at 90 °F or more

Freezing nights34nights a year at 32 °F or less

Growing degree days7,084base 50 °F — the season’s usable heat

Longest day14 h 04 mindaylight on June 21

Shortest day10 h 13 mindaylight on December 21

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

Precipitation39.1 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: Smithville, TX (12 mi away); precipitation: Smithville 6.6 Se, TX (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 9a.

789639a

West Point, TX · 6 mi

La Grange, TX · 12 mi

789579a

Smithville, TX · 13 mi

789569a

Schulenburg, TX · 14 mi

Texas planting zones →

Questions about 78949

What planting zone is ZIP code 78949?

ZIP code 78949 (Muldoon, 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 Muldoon, TX?

The median last spring frost (32 °F) near 78949 is March 12; after April 11 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Smithville station.

When is the first frost in Muldoon, TX?

The median first fall frost near 78949 is November 19, giving a median frost-free growing season of 251 days.

When should I plant tomatoes in 78949?

Start tomato seeds indoors around Jan 15 – Jan 29 and set transplants outside around Mar 19 – Apr 2, one to three weeks after the median last frost.

How much rain and snow does 78949 get?

About 39.1 inches of precipitation a year (NOAA 1991–2020 normals, Smithville 6.6 Se station).

How hot do summers get in Muldoon, TX?

The average high peaks at 97 °F in August, with about 124 days a year at 90 °F or more.

What kind of soil does 78949 have?

The USDA soil survey maps Cadell at the center of ZIP 78949: very fine sandy loam, moderately well drained, pH about 6.7 (neutral).

Did spring come early in Muldoon, TX in 2026?

Spring leaf-out near 78949 came on Jan 15 in 2026, 10 days earlier than the 1991–2020 average (Jan 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Muldoon, TX?

Short-day onions: the longest day near 78949 is 14 h 04 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.

Did the zone for 78949 change?

Yes. The 2012 USDA map put 78949 in zone 8b; the 2023 map puts it in zone 9a. The newer map uses 1991–2020 data and more weather stations.