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

Planting zone for 73526 — Blair, OK

ZIP code 73526 (Blair, Jackson County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 2 and the first fall frost November 3.

Where ZIP 73526 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.

Zone7b5 to 10 °F

Coldest night−15 to −12.2 °C

Last frostApr 2

First frostNov 3

2012 zone7a

Was 7a 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 7b means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Blair, OK…

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 Blair, OK

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 2median — 50% chance of a later frost

Safe for tender plantsApril 21only 10% chance of frost after

First fall frostNovember 3median — 10% chance by Oct 18

Growing season213 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 21 and returns around November 12.

From the NOAA station Altus Dam, OK — 7 miles away, elevation 1,526 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 73526

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 19 – Mar 5

SpinachSow outdoors · Feb 19 – Mar 12

Broccoli, cabbageStart indoors · Jan 22 – Feb 5

Broccoli, cabbageTransplant · Mar 12 – Mar 26

Onion setsPlant outdoors · Mar 5 – Mar 19

PotatoesPlant outdoors · Mar 12 – Mar 26

LettuceSow outdoors · Mar 5 – Mar 19

Carrots, beetsSow outdoors · Mar 12 – Mar 26

TomatoesStart indoors · Feb 5 – Feb 19

TomatoesTransplant · Apr 9 – Apr 23

Peppers, eggplantStart indoors · Jan 22 – Feb 5

Peppers, eggplantTransplant · Apr 16 – Apr 30

BeansSow outdoors · Apr 9 – Apr 23

Sweet cornSow outdoors · Apr 9 – Apr 23

Cucumbers, squashSow outdoors · Apr 9 – Apr 23

Fall lettuce, spinachSow outdoors · Sep 8 – Sep 22

GarlicPlant cloves · Oct 20 – Nov 24

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 2) and first fall frost (Nov 3) 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 73526 came on Feb 12 — 9 days earlier than the 1991–2020 average (Feb 21).

average
Feb 212026
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).

Native plants for zone 7b in Oklahoma

518 plants native to the lower 48 states, recorded in Oklahoma, and rated by the USDA to survive 5 °F or colder — the bottom of zone 7b. 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 Blair, OK.

Soil in Blair, OK

The soil mapped at the center of ZIP 73526 is Headrick — loamy sand, somewhat poorly drained.

TextureLoamy sanddrains and warms fast; dries out and needs more feeding

pH6.5neutral; most vegetables like 6.0–7.0

DrainageSomewhat poorly drainedconsider raised beds

Organic matter0.8%low — add compost

Hydrologic groupCwater soaks in slowly

Farmland classprime farmlandUSDA classification

Map unit: Headrick loamy sand, 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 73526; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Blair, OK

Summer high95 °Faverage high, July

Winter low27 °Faverage low, January

Hot days95days a year at 90 °F or more

Freezing nights76nights a year at 32 °F or less

Growing degree days5,353base 50 °F — the season’s usable heat

Longest day14 h 30 mindaylight on June 21

Shortest day9 h 49 mindaylight on December 21

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

Precipitation30.8 inper year, rain and melted snow

Snowfall2 inper year; 1 days with snow on the ground

Average high and low, by month

Precipitation by month inches · ❄ = snowfall

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Altus Dam, OK (7 mi away); precipitation: Altus Dam, OK (7 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

735567b

Martha, OK · 8 mi

735237b

Altus Afb, OK · 10 mi

Lone Wolf, OK · 13 mi

Oklahoma planting zones →

Questions about 73526

What planting zone is ZIP code 73526?

ZIP code 73526 (Blair, OK) is in USDA hardiness zone 7b on the 2023 map: the coldest night of an average winter reaches 5 to 10 °F (−15 to −12.2 °C).

When is the last frost in Blair, OK?

The median last spring frost (32 °F) near 73526 is April 2; after April 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Altus Dam station.

When is the first frost in Blair, OK?

The median first fall frost near 73526 is November 3, giving a median frost-free growing season of 213 days.

When should I plant tomatoes in 73526?

Start tomato seeds indoors around Feb 5 – Feb 19 and set transplants outside around Apr 9 – Apr 23, one to three weeks after the median last frost.

How much rain and snow does 73526 get?

About 30.8 inches of precipitation a year and 2 inches of snowfall (NOAA 1991–2020 normals, Altus Dam station).

How hot do summers get in Blair, OK?

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

What kind of soil does 73526 have?

The USDA soil survey maps Headrick at the center of ZIP 73526: loamy sand, somewhat poorly drained, pH about 6.5 (neutral).

Did spring come early in Blair, OK in 2026?

Spring leaf-out near 73526 came on Feb 12 in 2026, 9 days earlier than the 1991–2020 average (Feb 21), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Blair, OK?

Intermediate onions: the longest day near 73526 is 14 h 30 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 73526 change?

Yes. The 2012 USDA map put 73526 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.