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

Planting zone for 74120 — Tulsa, OK

ZIP code 74120 (Tulsa, Tulsa County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is March 31 and the first fall frost November 4.

Where ZIP 74120 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 frostMar 31
First frostNov 4
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 Tulsa, 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 Tulsa, OK

JanFebMarAprMayJunJulAugSepOctNovDec
Blue: frost possible · fading green: frost risk falling or rising (90% → 10%) · green: frost-free
Last spring frostMarch 31median — 50% chance of a later frost
Safe for tender plantsApril 15only 10% chance of frost after
First fall frostNovember 4median — 10% chance by Oct 20
Growing season220 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 17 and returns around November 13.

From the NOAA station Tulsa Intl Airport, OK — 6 miles away, elevation 650 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 74120

JanFebMarAprMayJunJulAugSepOctNovDec
PeasSow outdoors · Feb 17 – Mar 3
SpinachSow outdoors · Feb 17 – Mar 10
Broccoli, cabbageStart indoors · Jan 20 – Feb 3
Broccoli, cabbageTransplant · Mar 10 – Mar 24
Onion setsPlant outdoors · Mar 3 – Mar 17
PotatoesPlant outdoors · Mar 10 – Mar 24
LettuceSow outdoors · Mar 3 – Mar 17
Carrots, beetsSow outdoors · Mar 10 – Mar 24
TomatoesStart indoors · Feb 3 – Feb 17
TomatoesTransplant · Apr 7 – Apr 21
Peppers, eggplantStart indoors · Jan 20 – Feb 3
Peppers, eggplantTransplant · Apr 14 – Apr 28
BeansSow outdoors · Apr 7 – Apr 21
Sweet cornSow outdoors · Apr 7 – Apr 21
Cucumbers, squashSow outdoors · Apr 7 – Apr 21
Fall lettuce, spinachSow outdoors · Sep 9 – Sep 23
GarlicPlant cloves · Oct 21 – Nov 25
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 31) and first fall frost (Nov 4) 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 74120 came on Feb 12 — 13 days earlier than the 1991–2020 average (Feb 25).

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.

Trees 60

American basswood100 ft · blooms late spring · low shade tolerance · to −46 °FAmerican beech80 ft · blooms mid spring · low shade tolerance · to −44 °FAmerican elm120 ft · blooms early spring · medium shade tolerance · to −46 °FAmerican sycamore100 ft · blooms spring · medium shade tolerance · to −34 °FArizona walnut50 ft · blooms late spring · high shade tolerance · to −33 °Fbald cypress130 ft · blooms mid spring · medium shade tolerance · to −18 °F

Shrubs 91

alderleaf mountain mahogany15 ft · blooms late spring · medium shade tolerance · to −41 °FAmerican beautyberry6 ft · blooms early summer · medium shade tolerance · to −8 °FAmerican hazelnut10 ft · blooms spring · medium shade tolerance · to −33 °FAmerican holly40 ft · blooms mid spring · low shade tolerance · to −20 °FAmerican hornbeam30 ft · blooms mid spring · low shade tolerance · to −34 °FAmerican plum24 ft · blooms mid spring · high shade tolerance · to −38 °F

Wildflowers & perennials 188

alkali buttercup1 ft · blooms late spring · low shade tolerance · to −38 °FAmerican bur-reed3 ft · blooms indeterminate · medium shade tolerance · to −33 °FAmerican eelgrass1 ft · blooms mid summer · high shade tolerance · to −33 °FAmerican licorice4 ft · blooms late spring · medium shade tolerance · to −38 °FAmerican lotus3 ft · blooms mid summer · high shade tolerance · to −36 °FAmerican pokeweed7 ft · blooms mid summer · low shade tolerance · to −33 °F

Grasses 157

alkali sacaton3 ft · blooms mid summer · high shade tolerance · to −38 °FAmerican cupscale3 ft · blooms early summer · high shade tolerance · to −18 °FArizona cottontop4 ft · blooms late summer · high shade tolerance · to −13 °FArizona threeawn2 ft · blooms mid summer · high shade tolerance · to −3 °Fautumn bluegrass1.5 ft · blooms late spring · medium shade tolerance · to −8 °Fawlfruit sedge4 ft · blooms mid spring · low shade tolerance · to −38 °F

Vines 15

American bittersweet15 ft · blooms spring · low shade tolerance · to −38 °FAmerican wisteria50 ft · blooms spring · low shade tolerance · to −3 °Fcatbird grape30 ft · blooms late spring · medium shade tolerance · to −13 °Fcupseed30 ft · blooms late spring · low shade tolerance · to −3 °Fdevil's darning needles15 ft · blooms mid summer · medium shade tolerance · to −38 °Ffrost grape83 ft · blooms late spring · medium shade tolerance · to −23 °F

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 Tulsa, OK.

Soil in Tulsa, OK

The soil mapped at the center of ZIP 74120 is Dennis — silt loam, somewhat poorly drained. Much of the area is built over (urban land); this is the natural soil underneath.

TextureSilt loama good balance for most vegetables
pH5.6moderately acidic; most vegetables like 6.0–7.0
DrainageSomewhat poorly drainedconsider raised beds
Organic matter2.5%moderate
Hydrologic groupC/Dslow when drained; wet otherwise
Farmland classNot prime farmlandUSDA classification

Map unit: Urban land-Dennis complex, 0 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 74120; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Tulsa, OK

Summer high94 °Faverage high, July
Winter low28 °Faverage low, January
Hot days74days a year at 90 °F or more
Freezing nights72nights a year at 32 °F or less
Growing degree days5,332base 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
Precipitation44.3 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 49 °F, low 28 °F 49°28° JanFebruary: average high 54 °F, low 32 °F 54°32° FebMarch: average high 63 °F, low 41 °F 63°41° MarApril: average high 72 °F, low 50 °F 72°50° AprMay: average high 80 °F, low 60 °F 80°60° MayJune: average high 88 °F, low 69 °F 88°69° JunJuly: average high 94 °F, low 73 °F 94°73° JulAugust: average high 93 °F, low 72 °F 93°72° AugSeptember: average high 85 °F, low 63 °F 85°63° SepOctober: average high 74 °F, low 51 °F 74°51° OctNovember: average high 61 °F, low 39 °F 61°39° NovDecember: average high 51 °F, low 31 °F 51°31° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.93 in precipitation 1.9 JanFebruary: 1.80 in precipitation 1.8 FebMarch: 3.38 in precipitation 3.4 MarApril: 4.30 in precipitation 4.3 AprMay: 5.58 in precipitation 5.6 MayJune: 4.80 in precipitation 4.8 JunJuly: 4.69 in precipitation 4.7 JulAugust: 4.24 in precipitation 4.2 AugSeptember: 3.84 in precipitation 3.8 SepOctober: 4.16 in precipitation 4.2 OctNovember: 2.91 in precipitation 2.9 NovDecember: 2.64 in precipitation 2.6 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Tulsa Intl Airport, OK (6 mi away); precipitation: Tulsa 6.3 Wsw, OK (4 mi away). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

741027b
Tulsa, OK · <1 mi
741827b
Tulsa, OK · <1 mi
741867b
Tulsa, OK · <1 mi
741877b
Tulsa, OK · <1 mi
741927b
Tulsa, OK · <1 mi
741197b
Tulsa, OK · <1 mi
741037b
Tulsa, OK · 1 mi
741047b
Tulsa, OK · 1 mi

All 51 ZIP codes in Tulsa → · Oklahoma planting zones →

Questions about 74120

What planting zone is ZIP code 74120?

ZIP code 74120 (Tulsa, 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 Tulsa, OK?

The median last spring frost (32 °F) near 74120 is March 31; after April 15 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Tulsa Intl Airport station.

When is the first frost in Tulsa, OK?

The median first fall frost near 74120 is November 4, giving a median frost-free growing season of 220 days.

When should I plant tomatoes in 74120?

Start tomato seeds indoors around Feb 3 – Feb 17 and set transplants outside around Apr 7 – Apr 21, one to three weeks after the median last frost.

How much rain and snow does 74120 get?

About 44.3 inches of precipitation a year (NOAA 1991–2020 normals, Tulsa 6.3 Wsw station).

How hot do summers get in Tulsa, OK?

The average high peaks at 94 °F in July, with about 74 days a year at 90 °F or more.

What kind of soil does 74120 have?

The USDA soil survey maps Dennis at the center of ZIP 74120: silt loam, somewhat poorly drained, pH about 5.6 (moderately acidic).

Did spring come early in Tulsa, OK in 2026?

Spring leaf-out near 74120 came on Feb 12 in 2026, 13 days earlier than the 1991–2020 average (Feb 25), according to the USA National Phenology Network Spring Index.

What kind of onions grow in Tulsa, OK?

Intermediate onions: the longest day near 74120 is 14 h 37 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 74120 change?

Yes. The 2012 USDA map put 74120 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.