According to the 2023 USDA Hardiness Zone Map Salt Lake County, Utah is in Zones 5a (-20°F to -15°F), 5b (-15°F to -10°F), 6a (-10°F to -5°F), 6b (-5°F to 0°F), 7a (0°F to 5°F) and 7b (5°F to 10°F). There is no change from the 2012 USDA Hardiness Zone Map which has Salt Lake County in also in Zones 5a (-20°F to -15°F), 5b (-15°F to -10°F), 6a (-10°F to -5°F), 6b (-5°F to 0°F), 7a (0°F to 5°F) and 7b (5°F to 10°F).