According to the 2023 USDA Hardiness Zone Map Rader Creek, Montana is in Zones 4b (-25°F to -20°F) and 5a (-20°F to -15°F). There is no change from the 2012 USDA Hardiness Zone Map which has Rader Creek in also in Zones 4b (-25°F to -20°F) and 5a (-20°F to -15°F).