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

Planting zone for 76273 — Whitesboro, TX

ZIP code 76273 (Whitesboro, Grayson County) is in USDA zone 8a: the coldest winter night averages 10 to 15 °F. The median last spring frost is March 19 and the first fall frost November 14.

Where ZIP 76273 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 19
First frostNov 14
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 Whitesboro, 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 Whitesboro, TX

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 19median — 50% chance of a later frost
Safe for tender plantsApril 6only 10% chance of frost after
First fall frostNovember 14median — 10% chance by Oct 31
Growing season242 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 5 and returns around November 28.

From the NOAA station Gainesville 5 Ene, TX — 10 miles away, elevation 869 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 76273

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 5 – Feb 19
SpinachSow outdoors · Feb 5 – Feb 26
Broccoli, cabbageStart indoors · Jan 8 – Jan 22
Broccoli, cabbageTransplant · Feb 26 – Mar 12
Onion setsPlant outdoors · Feb 19 – Mar 5
PotatoesPlant outdoors · Feb 26 – Mar 12
LettuceSow outdoors · Feb 19 – Mar 5
Carrots, beetsSow outdoors · Feb 26 – Mar 12
TomatoesStart indoors · Jan 22 – Feb 5
TomatoesTransplant · Mar 26 – Apr 9
Peppers, eggplantStart indoors · Jan 8 – Jan 22
Peppers, eggplantTransplant · Apr 2 – Apr 16
BeansSow outdoors · Mar 26 – Apr 9
Sweet cornSow outdoors · Mar 26 – Apr 9
Cucumbers, squashSow outdoors · Mar 26 – Apr 9
Fall lettuce, spinachSow outdoors · Sep 19 – Oct 3
GarlicPlant cloves · Oct 31 – Dec 5
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 19) and first fall frost (Nov 14) 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 76273 came on Feb 9 — 3 days earlier than the 1991–2020 average (Feb 12).

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 Whitesboro, TX

The soil mapped at the center of ZIP 76273 is Konsil — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter0.65%low — add compost
Hydrologic groupBwater soaks in moderately
Farmland classprime farmlandUSDA classification

Map unit: Konsil fine sandy loam, 2 to 5 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 76273; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Whitesboro, TX

Summer high94 °Faverage high, July
Winter low32 °Faverage low, January
Hot days82days a year at 90 °F or more
Freezing nights50nights a year at 32 °F or less
Growing degree days5,701base 50 °F — the season’s usable heat
Longest day14 h 24 mindaylight on June 21
Shortest day9 h 54 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation41.3 inper year, rain and melted snow

Average high and low, by month

20°30°40°50°60°70°80°90°100°32 °FJanuary: average high 53 °F, low 32 °F 53°32° JanFebruary: average high 58 °F, low 35 °F 58°35° FebMarch: average high 66 °F, low 43 °F 66°43° MarApril: average high 74 °F, low 51 °F 74°51° AprMay: average high 80 °F, low 60 °F 80°60° MayJune: average high 89 °F, low 69 °F 89°69° JunJuly: average high 94 °F, low 73 °F 94°73° JulAugust: average high 94 °F, low 72 °F 94°72° AugSeptember: average high 87 °F, low 65 °F 87°65° SepOctober: average high 76 °F, low 54 °F 76°54° OctNovember: average high 64 °F, low 43 °F 64°43° NovDecember: average high 55 °F, low 34 °F 55°34° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 2.47 in precipitation 2.5 JanFebruary: 2.16 in precipitation 2.2 FebMarch: 3.60 in precipitation 3.6 MarApril: 3.92 in precipitation 3.9 AprMay: 5.30 in precipitation 5.3 MayJune: 4.43 in precipitation 4.4 JunJuly: 2.74 in precipitation 2.7 JulAugust: 2.48 in precipitation 2.5 AugSeptember: 3.72 in precipitation 3.7 SepOctober: 4.39 in precipitation 4.4 OctNovember: 2.99 in precipitation 3.0 NovDecember: 3.14 in precipitation 3.1 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Gainesville 5 Ene, TX (10 mi away); precipitation: Sadler 3.2 N, TX (5 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8a.

762648a
Sadler, TX · 6 mi
762458a
Gordonville, TX · 7 mi
734598a
Thackerville, OK · 12 mi
762688a
Southmayd, TX · 13 mi
750768a
Pottsboro, TX · 13 mi
762338a
Collinsville, TX · 14 mi
762408a
Gainesville, TX · 15 mi
750928a
Sherman, TX · 15 mi

Texas planting zones →

Questions about 76273

What planting zone is ZIP code 76273?

ZIP code 76273 (Whitesboro, 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 Whitesboro, TX?

The median last spring frost (32 °F) near 76273 is March 19; after April 6 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Gainesville 5 Ene station.

When is the first frost in Whitesboro, TX?

The median first fall frost near 76273 is November 14, giving a median frost-free growing season of 242 days.

When should I plant tomatoes in 76273?

Start tomato seeds indoors around Jan 22 – Feb 5 and set transplants outside around Mar 26 – Apr 9, one to three weeks after the median last frost.

How much rain and snow does 76273 get?

About 41.3 inches of precipitation a year (NOAA 1991–2020 normals, Sadler 3.2 N station).

How hot do summers get in Whitesboro, TX?

The average high peaks at 94 °F in July, with about 82 days a year at 90 °F or more.

What kind of soil does 76273 have?

The USDA soil survey maps Konsil at the center of ZIP 76273: fine sandy loam, well drained, pH about 7.0 (neutral).

Did spring come early in Whitesboro, TX in 2026?

Spring leaf-out near 76273 came on Feb 9 in 2026, 3 days earlier than the 1991–2020 average (Feb 12), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Whitesboro, TX?

Intermediate onions: the longest day near 76273 is 14 h 24 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 76273 change?

Yes. The 2012 USDA map put 76273 in zone 7b; the 2023 map puts it in zone 8a. The newer map uses 1991–2020 data and more weather stations.