According to the 2023 USDA Hardiness Zone Map Whitley County, Kentucky is in Zones 7a (0°F to 5°F) and 7b (5°F to 10°F). This is a change from the 2012 USDA Hardiness Zone Map which has Whitley County in Zones 6a (-10°F to -5°F) and 6b (-5°F to 0°F).