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

Planting zone for 75080 — Richardson, TX

ZIP code 75080 (Richardson, Dallas County) is in USDA zone 8b: the coldest winter night averages 15 to 20 °F. The median last spring frost is March 7 and the first fall frost November 21.

Where ZIP 75080 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 7

First frostNov 21

2012 zone8a

Was 8a 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 8b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Richardson, 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 Richardson, TX

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostMarch 7median — 50% chance of a later frost

Safe for tender plantsMarch 29only 10% chance of frost after

First fall frostNovember 21median — 10% chance by Nov 2

Growing season259 daysfrost-free, median

A hard freeze (28 °F) usually ends around February 24 and returns around December 4.

From the NOAA station Richardson, TX — within 1 mile, elevation 679 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 75080

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Jan 24 – Feb 7

SpinachSow outdoors · Jan 24 – Feb 14

Broccoli, cabbageStart indoors · Dec 27 – Jan 10

Broccoli, cabbageTransplant · Feb 14 – Feb 28

Onion setsPlant outdoors · Feb 7 – Feb 21

PotatoesPlant outdoors · Feb 14 – Feb 28

LettuceSow outdoors · Feb 7 – Feb 21

Carrots, beetsSow outdoors · Feb 14 – Feb 28

TomatoesStart indoors · Jan 10 – Jan 24

TomatoesTransplant · Mar 14 – Mar 28

Peppers, eggplantStart indoors · Dec 27 – Jan 10

Peppers, eggplantTransplant · Mar 21 – Apr 4

BeansSow outdoors · Mar 14 – Mar 28

Sweet cornSow outdoors · Mar 14 – Mar 28

Cucumbers, squashSow outdoors · Mar 14 – Mar 28

Fall lettuce, spinachSow outdoors · Sep 26 – Oct 10

GarlicPlant cloves · Nov 7 – Dec 12

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 7) and first fall frost (Nov 21) 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 75080 came on Feb 8 — 3 days later than the 1991–2020 average (Feb 5).

average
Feb 52026
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 8b in Texas

620 plants native to the lower 48 states, recorded in Texas, and rated by the USDA to survive 15 °F or colder — the bottom of zone 8b. 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 Richardson, TX.

Soil in Richardson, TX

The soil mapped at the center of ZIP 75080 is Austin — silty clay, well drained.

TextureSilty clayholds water and nutrients; slow to drain and warm up

pH8.2alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter2.5%moderate

Hydrologic groupCwater soaks in slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Austin-Urban land complex, 0 to 2 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 75080; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Richardson, TX

Summer high95 °Faverage high, August

Winter low36 °Faverage low, January

Hot days93days a year at 90 °F or more

Freezing nights35nights a year at 32 °F or less

Growing degree days6,359base 50 °F — the season’s usable heat

Longest day14 h 20 mindaylight on June 21

Shortest day9 h 58 mindaylight on December 21

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

Precipitation40.1 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: Richardson, TX (within 1 mile); precipitation: Richardson 2.2 Nw, TX (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 8b.

750818b

Richardson, TX · 3 mi

All 5 ZIP codes in Richardson → · Texas planting zones →

Questions about 75080

What planting zone is ZIP code 75080?

ZIP code 75080 (Richardson, 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 Richardson, TX?

The median last spring frost (32 °F) near 75080 is March 7; after March 29 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Richardson station.

When is the first frost in Richardson, TX?

The median first fall frost near 75080 is November 21, giving a median frost-free growing season of 259 days.

When should I plant tomatoes in 75080?

Start tomato seeds indoors around Jan 10 – Jan 24 and set transplants outside around Mar 14 – Mar 28, one to three weeks after the median last frost.

How much rain and snow does 75080 get?

About 40.1 inches of precipitation a year (NOAA 1991–2020 normals, Richardson 2.2 Nw station).

How hot do summers get in Richardson, TX?

The average high peaks at 95 °F in August, with about 93 days a year at 90 °F or more.

What kind of soil does 75080 have?

The USDA soil survey maps Austin at the center of ZIP 75080: silty clay, well drained, pH about 8.2 (alkaline).

Did spring come early in Richardson, TX in 2026?

Spring leaf-out near 75080 came on Feb 8 in 2026, 3 days later than the 1991–2020 average (Feb 5), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Richardson, TX?

Intermediate onions: the longest day near 75080 is 14 h 20 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 75080 change?

Yes. The 2012 USDA map put 75080 in zone 8a; the 2023 map puts it in zone 8b. The newer map uses 1991–2020 data and more weather stations.