According to the 2023 USDA Hardiness Zone Map Big Water, Utah is in Zones 7b (5°F to 10°F) and 8a (10°F to 15°F). There is no change from the 2012 USDA Hardiness Zone Map which has Big Water in also in Zones 7b (5°F to 10°F) and 8a (10°F to 15°F).