Data: 2023 USDA zones (PRISM/OSU) · NOAA 1991–2020 normals · updated Oct 30, 2026

Planting zone for 74075 — Stillwater, OK

ZIP code 74075 (Stillwater, Payne County) is in USDA zone 7a: the coldest winter night averages 0 to 5 °F. The median last spring frost is April 3 and the first fall frost October 31.

Where ZIP 74075 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 3

First frostOct 31

2012 zone7a

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 7a means →

Frost forecast — next 7 nights

live from the National Weather Service

Loading the forecast for Stillwater, 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 Stillwater, OK

JanFebMarAprMayJunJulAugSepOctNovDec

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

Last spring frostApril 3median — 50% chance of a later frost

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

First fall frostOctober 31median — 10% chance by Oct 15

Growing season209 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 23 and returns around November 8.

From the NOAA station Stillwater Regional Airport, OK — within 1 mile, elevation 984 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 74075

JanFebMarAprMayJunJulAugSepOctNovDec

PeasSow outdoors · Feb 20 – Mar 6

SpinachSow outdoors · Feb 20 – Mar 13

Broccoli, cabbageStart indoors · Jan 23 – Feb 6

Broccoli, cabbageTransplant · Mar 13 – Mar 27

Onion setsPlant outdoors · Mar 6 – Mar 20

PotatoesPlant outdoors · Mar 13 – Mar 27

LettuceSow outdoors · Mar 6 – Mar 20

Carrots, beetsSow outdoors · Mar 13 – Mar 27

TomatoesStart indoors · Feb 6 – Feb 20

TomatoesTransplant · Apr 10 – Apr 24

Peppers, eggplantStart indoors · Jan 23 – Feb 6

Peppers, eggplantTransplant · Apr 17 – May 1

BeansSow outdoors · Apr 10 – Apr 24

Sweet cornSow outdoors · Apr 10 – Apr 24

Cucumbers, squashSow outdoors · Apr 10 – Apr 24

Fall lettuce, spinachSow outdoors · Sep 5 – Sep 19

GarlicPlant cloves · Oct 17 – Nov 21

Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Apr 3) and first fall frost (Oct 31) 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 74075 came on Feb 14 — 12 days earlier than the 1991–2020 average (Feb 26).

average
Feb 262026
Feb 14

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 Stillwater, OK.

Soil in Stillwater, OK

The soil mapped at the center of ZIP 74075 is Grainola — loam, well drained.

TextureLoama good balance for most vegetables

pH7.5slightly alkaline; most vegetables like 6.0–7.0

DrainageWell drainednatural drainage class

Organic matter0.75%low — add compost

Hydrologic groupDwater soaks in very slowly

Farmland classprime farmlandUSDA classification

Map unit: Grainola-Lucien complex, 1 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 74075; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Stillwater, OK

Summer high95 °Faverage high, July

Winter low27 °Faverage low, January

Hot days83days a year at 90 °F or more

Freezing nights87nights a year at 32 °F or less

Growing degree days5,389base 50 °F — the season’s usable heat

Longest day14 h 37 mindaylight on June 21

Shortest day9 h 42 mindaylight on December 21

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

Precipitation33.2 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: Stillwater Regional Airport, OK (within 1 mile); precipitation: Stillwater Regional Airport, OK (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

1 of the 8 nearest ZIP codes are in a different zone — elevation and distance from water change winter lows quickly.

740787a

Stillwater, OK · 3 mi

740777a

Stillwater, OK · 3 mi

740747a

Stillwater, OK · 6 mi

740767a

Stillwater, OK · 7 mi

All 5 ZIP codes in Stillwater → · Oklahoma planting zones →

Questions about 74075

What planting zone is ZIP code 74075?

ZIP code 74075 (Stillwater, 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 Stillwater, OK?

The median last spring frost (32 °F) near 74075 is April 3; after April 21 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Stillwater Regional Airport station.

When is the first frost in Stillwater, OK?

The median first fall frost near 74075 is October 31, giving a median frost-free growing season of 209 days.

When should I plant tomatoes in 74075?

Start tomato seeds indoors around Feb 6 – Feb 20 and set transplants outside around Apr 10 – Apr 24, one to three weeks after the median last frost.

How much rain and snow does 74075 get?

About 33.2 inches of precipitation a year (NOAA 1991–2020 normals, Stillwater Regional Airport station).

How hot do summers get in Stillwater, OK?

The average high peaks at 95 °F in July, with about 83 days a year at 90 °F or more.

What kind of soil does 74075 have?

The USDA soil survey maps Grainola at the center of ZIP 74075: loam, well drained, pH about 7.5 (slightly alkaline).

Did spring come early in Stillwater, OK in 2026?

Spring leaf-out near 74075 came on Feb 14 in 2026, 12 days earlier than the 1991–2020 average (Feb 26), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Stillwater, OK?

Intermediate onions: the longest day near 74075 is 14 h 37 min, so day-neutral types bulb best; long-day varieties may not bulb fully.