According to the 2023 USDA Hardiness Zone Map Mono County, California 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), 7b (5°F to 10°F) and 8a (10°F to 15°F). This is a change from the 2012 USDA Hardiness Zone Map which has Mono County in Zones 4b (-25°F to -20°F), 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).