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

Planting zone for 75633 — Carthage, TX

ZIP code 75633 (Carthage, Panola County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 8 and the first fall frost November 19.

Where ZIP 75633 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.

Zone8b15 to 20 °F
Coldest night−9.4 to −6.7 °C
Last frostMar 8
First frostNov 19
2012 zone8b

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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Carthage, 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 Carthage, TX

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 8median — 50% chance of a later frost
Safe for tender plantsMarch 31only 10% chance of frost after
First fall frostNovember 19median — 10% chance by Nov 2
Growing season255 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 24 and returns around December 2.

From the NOAA station Carthage, TX — 4 miles away, elevation 305 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 75633

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Jan 25 – Feb 8
SpinachSow outdoors · Jan 25 – Feb 15
Broccoli, cabbageStart indoors · Dec 28 – Jan 11
Broccoli, cabbageTransplant · Feb 15 – Mar 1
Onion setsPlant outdoors · Feb 8 – Feb 22
PotatoesPlant outdoors · Feb 15 – Mar 1
LettuceSow outdoors · Feb 8 – Feb 22
Carrots, beetsSow outdoors · Feb 15 – Mar 1
TomatoesStart indoors · Jan 11 – Jan 25
TomatoesTransplant · Mar 15 – Mar 29
Peppers, eggplantStart indoors · Dec 28 – Jan 11
Peppers, eggplantTransplant · Mar 22 – Apr 5
BeansSow outdoors · Mar 15 – Mar 29
Sweet cornSow outdoors · Mar 15 – Mar 29
Cucumbers, squashSow outdoors · Mar 15 – Mar 29
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 8) 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 75633 came on Feb 4 — about the same time as the 1991–2020 average (Feb 3).

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 Carthage, TX

The soil mapped at the center of ZIP 75633 is Wrightsville — silt loam, poorly drained.

TextureSilt loama good balance for most vegetables
pH5.3strongly acidic; most vegetables like 6.0–7.0
DrainagePoorly drainedconsider raised beds
Organic matter1.75%low — add compost
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Wrightsville-Timpson complex, 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 75633; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Carthage, TX

Summer high93 °Faverage high, August
Winter low36 °Faverage low, January
Hot days89days a year at 90 °F or more
Freezing nights39nights a year at 32 °F or less
Growing degree days6,160base 50 °F — the season’s usable heat
Longest day14 h 15 mindaylight on June 21
Shortest day10 h 02 mindaylight on December 21
Onions to growShort-daysummer days stay under about 14 h 20 min, so long-day varieties won’t bulb
Precipitation52.3 inper year, rain and melted snow
Snowfall1 inper year

Average high and low, by month

30°40°50°60°70°80°90°100°32 °FJanuary: average high 57 °F, low 36 °F 57°36° JanFebruary: average high 61 °F, low 40 °F 61°40° FebMarch: average high 69 °F, low 46 °F 69°46° MarApril: average high 76 °F, low 54 °F 76°54° AprMay: average high 83 °F, low 63 °F 83°63° MayJune: average high 89 °F, low 70 °F 89°70° JunJuly: average high 92 °F, low 73 °F 92°73° JulAugust: average high 93 °F, low 73 °F 93°73° AugSeptember: average high 87 °F, low 66 °F 87°66° SepOctober: average high 78 °F, low 55 °F 78°55° OctNovember: average high 67 °F, low 45 °F 67°45° NovDecember: average high 59 °F, low 38 °F 59°38° Dec

Precipitation by month inches · ❄ = snowfall

0″1″2″3″4″5″6″January: 4.66 in precipitation, 0.3 in snowfall 4.7 JanFebruary: 4.23 in precipitation, 0.4 in snowfall 4.2 FebMarch: 4.92 in precipitation, 0.1 in snowfall 4.9 MarApril: 4.72 in precipitation 4.7 AprMay: 4.35 in precipitation 4.3 MayJune: 4.04 in precipitation 4.0 JunJuly: 3.64 in precipitation 3.6 JulAugust: 3.44 in precipitation 3.4 AugSeptember: 3.67 in precipitation 3.7 SepOctober: 4.54 in precipitation 4.5 OctNovember: 4.44 in precipitation 4.4 NovDecember: 5.63 in precipitation 5.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Carthage, TX (4 mi away); precipitation: Carthage, TX (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

756438b
Gary, TX · 11 mi
756398b
De Berry, TX · 11 mi
759748b
Tenaha, TX · 13 mi
756378b
Clayton, TX · 13 mi
756318b
Beckville, TX · 13 mi
756428b
Elysian Fields, TX · 16 mi
756698b
Long Branch, TX · 18 mi
756858b
Panola, TX · 19 mi

Texas planting zones →

Questions about 75633

What planting zone is ZIP code 75633?

ZIP code 75633 (Carthage, TX) is in USDA hardiness zone 8b on the 2023 map: the coldest night of an average winter reaches 15 to 20 °F (−9.4 to −6.7 °C).

When is the last frost in Carthage, TX?

The median last spring frost (32 °F) near 75633 is March 8; after March 31 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Carthage station.

When is the first frost in Carthage, TX?

The median first fall frost near 75633 is November 19, giving a median frost-free growing season of 255 days.

When should I plant tomatoes in 75633?

Start tomato seeds indoors around Jan 11 – Jan 25 and set transplants outside around Mar 15 – Mar 29, one to three weeks after the median last frost.

How much rain and snow does 75633 get?

About 52.3 inches of precipitation a year and 1 inches of snowfall (NOAA 1991–2020 normals, Carthage station).

How hot do summers get in Carthage, TX?

The average high peaks at 93 °F in August, with about 89 days a year at 90 °F or more.

What kind of soil does 75633 have?

The USDA soil survey maps Wrightsville at the center of ZIP 75633: silt loam, poorly drained, pH about 5.3 (strongly acidic).

Did spring come early in Carthage, TX in 2026?

Spring leaf-out near 75633 came on Feb 4 in 2026, about the same as the 1991–2020 average (Feb 3), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Carthage, TX?

Short-day onions: the longest day near 75633 is 14 h 15 min, so summer days stay under about 14 h 20 min, so long-day varieties won’t bulb.