What Growing Zone Is Oklahoma In?
USDA hardiness zones
6b to 8a
2023 USDA Plant Hardiness Zone Map
Oklahoma spans USDA hardiness zone 6b to 8a across its major population centers, according to the 2023 USDA Plant Hardiness Zone Map. That's a real range, not a single number: where you fall in it depends on where in the state you actually are.
Hardiness zone for ZIP 74103 (Tulsa)
Your USDA hardiness zone
Zone 7b
Avg. annual minimum (°F)
5°F to 10°F
Avg. annual minimum (°C)
-15°C to -12°C
Nearest reference point: Tulsa, OK
This is a regional estimate based on the nearest of 826 reference points, each matched to the official 2023 USDA zone map. It’s accurate to within about a half-zone across most of the country, but elevation shifts zones over short distances, so if you’re in mountainous terrain, check the official USDA map for your exact address (see Sources below).
Oklahoma's USDA Hardiness Zones
Here's how the zone shifts across Oklahoma's major cities:
For your exact zone by ZIP code, use the Hardiness Zone Finder, and for what a zone number actually measures (and doesn't), see how zones actually work.
Frost Dates in Oklahoma
Frost dates track zone, so they shift across Oklahoma the same way the zone number does:
- Panhandle (Guymon) (zone 6): average last frost Mar 29 - Apr 12, average first frost Oct 18 - Nov 1.
- Southeastern Oklahoma (Broken Bow) (zone 8): average last frost Mar 8 - Mar 22, average first frost Nov 8 - Nov 22.
These are averages, not guarantees. For your specific frost window, use the Frost Date Calculator. For a full vegetable-by-vegetable planting calendar already calculated from Oklahoma's frost dates, see the Oklahoma Planting Calendar.
Oklahoma transitions from a wetter, warmer southeast to a drier, colder western Panhandle, per NOAA's State Climate Summary -- a gradient reflected in the roughly 1.5-zone difference between Broken Bow (8a) and Guymon (6b).
What Grows Well in Oklahoma's Zones
A few real, zone-appropriate picks recommended by Oklahoma State University Extension, Oklahoma Proven program for Oklahoma landscapes: not an exhaustive list, but a genuine starting point.
- Chinkapin oak (Quercus muehlenbergii)
- Fringetree (Chionanthus virginicus)
- Cedar elm (Ulmus crassifolia)
- Buttonbush (Cephalanthus occidentalis)
- Coral bells (Heuchera spp.)
Ready to find your exact zone? Use the Hardiness Zone Finder: enter your ZIP code for a precise match against the 2023 USDA map.
Oklahoma Growing Zone FAQ
What growing zone is Oklahoma in?
Oklahoma spans USDA hardiness zones 6b to 8a on the 2023 USDA Plant Hardiness Zone Map. Guymon is zone 6b and Oklahoma City is zone 7b; enter your ZIP code in the Hardiness Zone Finder for your exact zone.
What growing zone is Tulsa, OK?
Tulsa is in USDA hardiness zone 7b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Oklahoma City, OK?
Oklahoma City is in USDA hardiness zone 7b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Guymon, OK?
Guymon is in USDA hardiness zone 6b on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
What growing zone is Broken Bow, OK?
Broken Bow is in USDA hardiness zone 8a on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
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The Spacing & Planting Cheat Sheet
When to start, when to plant, how far apart.
Sources & further reading
Zone and city data checked against the official USDA Plant Hardiness Zone Map. Plant recommendations sourced from Oklahoma State University Extension, Oklahoma Proven program. Climate note sourced from NOAA State Climate Summaries. For more on how we build and verify reference data across this site, see our methodology page.
Growing zones in nearby states
Gardening near a state line? Zones don't stop at the border:
- Texas growing zones
- Missouri growing zones
- Colorado growing zones
- Arkansas growing zones
- Kansas growing zones
- New Mexico growing zones
Or browse all 51 state growing-zone guides.