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

Planting zone for 74003 — Bartlesville, OK

ZIP code 74003 (Bartlesville, Washington County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 12 and the first fall frost October 21.

Where ZIP 74003 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.

Zone7a0 to 5 °F

Coldest night−17.8 to −15 °C

Last frostApr 12

First frostOct 21

2012 zone6b

Was 6b 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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Bartlesville, 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 Bartlesville, OK

JanFebMarAprMayJunJulAugSepOctNovDec

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

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

Safe for tender plantsApril 28only 10% chance of frost after

First fall frostOctober 21median — 10% chance by Oct 5

Growing season192 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 31 and returns around October 31.

From the NOAA station Bartlesville F P Field, OK — 4 miles away, elevation 715 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 74003

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Mar 1 – Mar 15

SpinachSow outdoors · Mar 1 – Mar 22

Broccoli, cabbageStart indoors · Feb 1 – Feb 15

Broccoli, cabbageTransplant · Mar 22 – Apr 5

Onion setsPlant outdoors · Mar 15 – Mar 29

PotatoesPlant outdoors · Mar 22 – Apr 5

LettuceSow outdoors · Mar 15 – Mar 29

Carrots, beetsSow outdoors · Mar 22 – Apr 5

TomatoesStart indoors · Feb 15 – Mar 1

TomatoesTransplant · Apr 19 – May 3

Peppers, eggplantStart indoors · Feb 1 – Feb 15

Peppers, eggplantTransplant · Apr 26 – May 10

BeansSow outdoors · Apr 19 – May 3

Sweet cornSow outdoors · Apr 19 – May 3

Cucumbers, squashSow outdoors · Apr 19 – May 3

Fall lettuce, spinachSow outdoors · Aug 26 – Sep 9

GarlicPlant cloves · Oct 7 – Nov 11

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 12) and first fall frost (Oct 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 74003 came on Feb 15 — 15 days earlier than the 1991–2020 average (Mar 2).

average
Mar 22026
Feb 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 7a in Oklahoma

511 plants native to the lower 48 states, recorded in Oklahoma, and rated by the USDA to survive 0 °F or colder — the bottom of zone 7a. 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 Bartlesville, OK.

Soil in Bartlesville, OK

The soil mapped at the center of ZIP 74003 is Bigheart — fine sandy loam, well drained.

TextureFine sandy loamdrains and warms fast; dries out and needs more feeding

pH6.0slightly acidic; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter1.5%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classNot prime farmlandUSDA classification

Map unit: Bigheart-Niotaze-Rock outcrop complex, 1 to 8 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 74003; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Bartlesville, OK

Summer high93 °Faverage high, July

Winter low22 °Faverage low, January

Hot days71days a year at 90 °F or more

Freezing nights97nights a year at 32 °F or less

Growing degree days4,609base 50 °F — the season’s usable heat

Longest day14 h 41 mindaylight on June 21

Shortest day9 h 39 mindaylight on December 21

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

Precipitation40.3 inper year, rain and melted snow

Snowfall8 inper year; 4 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: Bartlesville F P Field, OK (4 mi away); precipitation: Bartlesville F P Field, OK (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7a.

740057a

Bartlesville, OK · 5 mi

740067a

Bartlesville, OK · 10 mi

740047a

Bartlesville, OK · 10 mi

Barnsdall, OK · 12 mi

All 4 ZIP codes in Bartlesville → · Oklahoma planting zones →

Questions about 74003

What planting zone is ZIP code 74003?

ZIP code 74003 (Bartlesville, OK) is in USDA hardiness zone 7a on the 2023 map: the coldest night of an average winter reaches 0 to 5 °F (−17.8 to −15 °C).

When is the last frost in Bartlesville, OK?

The median last spring frost (32 °F) near 74003 is April 12; after April 28 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Bartlesville F P Field station.

When is the first frost in Bartlesville, OK?

The median first fall frost near 74003 is October 21, giving a median frost-free growing season of 192 days.

When should I plant tomatoes in 74003?

Start tomato seeds indoors around Feb 15 – Mar 1 and set transplants outside around Apr 19 – May 3, one to three weeks after the median last frost.

How much rain and snow does 74003 get?

About 40.3 inches of precipitation a year and 8 inches of snowfall (NOAA 1991–2020 normals, Bartlesville F P Field station).

How hot do summers get in Bartlesville, OK?

The average high peaks at 93 °F in July, with about 71 days a year at 90 °F or more.

What kind of soil does 74003 have?

The USDA soil survey maps Bigheart at the center of ZIP 74003: fine sandy loam, well drained, pH about 6.0 (slightly acidic).

Did spring come early in Bartlesville, OK in 2026?

Spring leaf-out near 74003 came on Feb 15 in 2026, 15 days earlier than the 1991–2020 average (Mar 2), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Bartlesville, OK?

Intermediate onions: the longest day near 74003 is 14 h 41 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 74003 change?

Yes. The 2012 USDA map put 74003 in zone 6b; the 2023 map puts it in zone 7a. The newer map uses 1991–2020 data and more weather stations.