What Growing Zone Is Ohio In?
USDA hardiness zones
6a to 7a
2023 USDA Plant Hardiness Zone Map
Ohio spans USDA hardiness zone 6a to 7a 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 43215 (Columbus)
Your USDA hardiness zone
Zone 6b
Avg. annual minimum (°F)
-5°F to 0°F
Avg. annual minimum (°C)
-21°C to -18°C
Nearest reference point: Columbus, OH
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).
Ohio's USDA Hardiness Zones
Here's how the zone shifts across Ohio'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 Ohio
Frost dates track zone, so they shift across Ohio the same way the zone number does:
- Inland/snowbelt (Youngstown) (zone 6): average last frost Mar 29 - Apr 12, average first frost Oct 18 - Nov 1.
- Lake Erie shoreline (Cleveland) (zone 7): average last frost Mar 18 - Apr 1, average first frost Oct 29 - Nov 12.
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 Ohio's frost dates, see the Ohio Planting Calendar.
Ohio's zone gradient is shaped by Lake Erie's lake-effect: shoreline areas near Cleveland are moderated into a warmer band, documented in NOAA/NWS lake-effect climatology, while inland snowbelt areas like Youngstown run colder.
What Grows Well in Ohio's Zones
A few real, zone-appropriate picks recommended by Ohio State University Extension (Ohioline) for Ohio landscapes: not an exhaustive list, but a genuine starting point.
- Ninebark (Physocarpus opulifolius)
- Red chokeberry (Aronia arbutifolia)
- Blackhaw viburnum (Viburnum prunifolium)
- Winterberry holly (Ilex verticillata)
- Downy serviceberry (Amelanchier arborea)
- Eastern redbud (Cercis canadensis)
Ready to find your exact zone? Use the Hardiness Zone Finder: enter your ZIP code for a precise match against the 2023 USDA map.
Ohio Growing Zone FAQ
What growing zone is Ohio in?
Ohio spans USDA hardiness zones 6a to 7a on the 2023 USDA Plant Hardiness Zone Map. Youngstown is zone 6a and Columbus is zone 6b; enter your ZIP code in the Hardiness Zone Finder for your exact zone.
What growing zone is Columbus, OH?
Columbus 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 Cincinnati, OH?
Cincinnati 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 Dayton, OH?
Dayton 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 Cleveland, OH?
Cleveland is in USDA hardiness zone 7a on the 2023 USDA map. Zones within a city can differ by half a zone, so check your ZIP code for an exact match.
Free book · 23 pages, PDF
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 Ohio State University Extension (Ohioline). Climate note sourced from NOAA/National Weather Service. 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:
- Pennsylvania growing zones
- Michigan growing zones
- Indiana growing zones
- Kentucky growing zones
- West Virginia growing zones
Or browse all 51 state growing-zone guides.