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

Planting zone for Norman, OK

Norman, OK is in USDA zone 7b across its 6 ZIP codes. The median last spring frost is March 31 and the first fall frost November 5.

Norman on the zone map

Outlined: its 6 ZIP code areas · 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
ZIP codes6
Last frostMar 31
First frostNov 5
Growing season219 days

7b 6 ZIPs

Frost forecast — next 7 nights

live from the National Weather Service

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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 Norman, 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 17only 10% chance of frost after
First fall frostNovember 5median — 10% chance by Oct 21
Growing season219 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 16 and returns around November 14.

From the NOAA station Norman 2nw Mesonet, OK, elevation 1,181 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 Norman

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 10 – Sep 24
GarlicPlant cloves · Oct 22 – Nov 26
Start seeds indoorsSow or plant outdoorsFall plantingMedian last & first frost

Counted from the median last spring frost (Mar 31) and first fall frost (Nov 5) 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 73070 came on Feb 12 — 9 days earlier than the 1991–2020 average (Feb 21).

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 Norman, OK.

Soil in Norman, OK

The soil mapped at the center of ZIP 73070 is Renfrow — silt loam, well drained.

TextureSilt loama good balance for most vegetables
pH7.0neutral; most vegetables like 6.0–7.0
DrainageWell drainednatural drainage class
Organic matter2%moderate
Hydrologic groupDwater soaks in very slowly
Farmland classNot prime farmlandUSDA classification

Map unit: Renfrow-Urban land-Huska 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 73070; soils change within a few hundred feet, so a home soil test (pH, nutrients) is still the best guide.

Climate in Norman, OK

Summer high93 °Faverage high, July
Winter low29 °Faverage low, January
Hot days76days a year at 90 °F or more
Freezing nights72nights a year at 32 °F or less
Growing degree days5,241base 50 °F — the season’s usable heat
Longest day14 h 32 mindaylight on June 21
Shortest day9 h 47 mindaylight on December 21
Onions to growIntermediateday-neutral types bulb best; long-day varieties may not bulb fully
Precipitation37.4 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 51 °F, low 29 °F 51°29° JanFebruary: average high 55 °F, low 32 °F 55°32° FebMarch: average high 64 °F, low 41 °F 64°41° MarApril: average high 72 °F, low 49 °F 72°49° AprMay: average high 79 °F, low 59 °F 79°59° MayJune: average high 88 °F, low 68 °F 88°68° JunJuly: average high 93 °F, low 72 °F 93°72° JulAugust: average high 93 °F, low 71 °F 93°71° AugSeptember: average high 84 °F, low 63 °F 84°63° SepOctober: average high 74 °F, low 51 °F 74°51° OctNovember: average high 62 °F, low 39 °F 62°39° NovDecember: average high 51 °F, low 31 °F 51°31° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.39 in precipitation 1.4 JanFebruary: 1.56 in precipitation 1.6 FebMarch: 2.68 in precipitation 2.7 MarApril: 3.65 in precipitation 3.6 AprMay: 5.41 in precipitation 5.4 MayJune: 4.70 in precipitation 4.7 JunJuly: 3.54 in precipitation 3.5 JulAugust: 3.73 in precipitation 3.7 AugSeptember: 3.42 in precipitation 3.4 SepOctober: 3.27 in precipitation 3.3 OctNovember: 1.99 in precipitation 2.0 NovDecember: 2.05 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Norman 2nw Mesonet, OK (2 mi away); precipitation: Norman 1.9 Ne, OK (within 1 mile). Daylight is calculated from latitude.

ZIP codes in Norman

730197b
5 to 10 °F
730267b
5 to 10 °F
730697b
5 to 10 °F
730707b
5 to 10 °F
730717b
5 to 10 °F
730727b
5 to 10 °F

Oklahoma planting zones →

Questions about Norman

What planting zone is Norman, OK?

Norman, OK is in USDA hardiness zone 7b on the 2023 map (7b: 5 to 10 °F).

When is the last frost in Norman, OK?

The median last spring frost is March 31 and the median first fall frost is November 5 (NOAA 1991–2020 normals, Norman 2nw Mesonet station).

When can I plant a garden in Norman, OK?

Cool-season crops like peas and spinach go in around Feb 17 – Mar 10; tomatoes, peppers, beans and squash after about Apr 7, once frost risk has passed.

What kind of onions grow in Norman, OK?

Intermediate onions: the longest day is 14 h 32 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

How much rain and snow does Norman, OK get?

About 37.4 inches of precipitation a year (NOAA 1991–2020 normals).