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

Planting zone for 73019 — Norman, OK

ZIP code 73019 (Norman, Cleveland County) is in USDA zone 7b: the coldest winter night averages 5 to 10 °F. The median last spring frost is April 3 and the first fall frost November 3.

Where ZIP 73019 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 3
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 Norman, 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 Norman, 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 18only 10% chance of frost after
First fall frostNovember 3median — 10% chance by Oct 21
Growing season212 daysfrost-free, median

A hard freeze (28 °F) usually ends around March 23 and returns around November 12.

From the NOAA station Norman 3sse, OK — 2 miles away, elevation 1,129 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 73019

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 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 3) 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 73019 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 center of ZIP 73019 is mapped as Urban land: built-over ground without natural soil data. Garden soil here is usually imported or disturbed — test before you plant.

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 73019; 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 low28 °Faverage low, January
Hot days69days a year at 90 °F or more
Freezing nights77nights a year at 32 °F or less
Growing degree days5,109base 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
Precipitation37.7 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 50 °F, low 28 °F 50°28° JanFebruary: average high 54 °F, low 31 °F 54°31° FebMarch: average high 63 °F, low 40 °F 63°40° MarApril: average high 71 °F, low 48 °F 71°48° AprMay: average high 79 °F, low 58 °F 79°58° MayJune: average high 87 °F, low 67 °F 87°67° JunJuly: average high 93 °F, low 71 °F 93°71° JulAugust: average high 92 °F, low 70 °F 92°70° AugSeptember: average high 84 °F, low 62 °F 84°62° SepOctober: average high 74 °F, low 50 °F 74°50° OctNovember: average high 62 °F, low 39 °F 62°39° NovDecember: average high 52 °F, low 31 °F 52°31° Dec

Precipitation by month inches

0″1″2″3″4″5″6″January: 1.43 in precipitation 1.4 JanFebruary: 1.53 in precipitation 1.5 FebMarch: 2.89 in precipitation 2.9 MarApril: 3.77 in precipitation 3.8 AprMay: 5.10 in precipitation 5.1 MayJune: 4.50 in precipitation 4.5 JunJuly: 3.40 in precipitation 3.4 JulAugust: 3.64 in precipitation 3.6 AugSeptember: 4.08 in precipitation 4.1 SepOctober: 3.42 in precipitation 3.4 OctNovember: 1.91 in precipitation 1.9 NovDecember: 2.02 in precipitation 2.0 Dec

NOAA NCEI U.S. Climate Normals 1991–2020 — temperature: Norman 3sse, OK (2 mi away); precipitation: Norman 2.1 Se, OK (within 1 mile). Daylight is calculated from latitude.

Nearby ZIP codes

All 8 nearest ZIP codes share zone 7b.

730707b
Norman, OK · 2 mi
730717b
Norman, OK · 3 mi
730727b
Norman, OK · 3 mi
730697b
Norman, OK · 3 mi
730937b
Washington, OK · 8 mi
731607b
Oklahoma City, OK · 9 mi
730267b
Norman, OK · 10 mi
730657b
Newcastle, OK · 10 mi

All 6 ZIP codes in Norman → · Oklahoma planting zones →

Questions about 73019

What planting zone is ZIP code 73019?

ZIP code 73019 (Norman, 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 Norman, OK?

The median last spring frost (32 °F) near 73019 is April 3; after April 18 there is only a 10% chance of frost. Data: NOAA 1991–2020 normals, Norman 3sse station.

When is the first frost in Norman, OK?

The median first fall frost near 73019 is November 3, giving a median frost-free growing season of 212 days.

When should I plant tomatoes in 73019?

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 73019 get?

About 37.7 inches of precipitation a year (NOAA 1991–2020 normals, Norman 2.1 Se station).

How hot do summers get in Norman, OK?

The average high peaks at 93 °F in July, with about 69 days a year at 90 °F or more.

Did spring come early in Norman, OK in 2026?

Spring leaf-out near 73019 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 Norman, OK?

Intermediate onions: the longest day near 73019 is 14 h 32 min, so day-neutral types bulb best; long-day varieties may not bulb fully.

Did the zone for 73019 change?

Yes. The 2012 USDA map put 73019 in zone 7a; the 2023 map puts it in zone 7b. The newer map uses 1991–2020 data and more weather stations.