According to the 2023 USDA Hardiness Zone Map Star Valley Ranch, Wyoming is in Zones 4b (-25°F to -20°F), 5a (-20°F to -15°F) and 5b (-15°F to -10°F). This is a change from the 2012 USDA Hardiness Zone Map which has Star Valley Ranch in Zones 4b (-25°F to -20°F).