Ohio USDA Hardiness Zones The three USDA zones found in Ohio are 5b, 6a, and 6b. The majority of the state falls under zone 6a, with low temperatures bottoming out between minus 5 and minus 10 F.Click to see full answer. Moreover, what is my growing zone?If you see a hardiness zone in a gardening catalog or plant description, chances are it refers to this USDA map. To find your USDA Hardiness Zone, enter your zip code or use the map below. Click here for more information about hardiness maps. Find your zone using the map below or enter your zip code.Also, what climate zone is Cleveland Ohio? Cleveland, Ohio is in USDA Hardiness Zones 6a and 6b. Also asked, what zone is Columbus Ohio for planting? Columbus, Ohio is in USDA Hardiness Zones 6a.What planting zone is Zanesville Ohio? zone 6a