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Is Tulsa in USDA Hardiness Zone 6 or 7?

Tulsa and the surrounding areas are actually in Zone 7a, which means that the average annual minimum temperature is from 0 to 5 degrees Fahrenheit. Bartlesville, on the other hand, is in Zone 6b, whereas Zone 7b starts just south of Okmulgee. Other than annuals and tropicals, the plants we sell are hardy in all three Zones.