According to the 2023 USDA Hardiness Zone Map Hettinger County, North Dakota is in Zones 4a (-30°F to -25°F) and 4b (-25°F to -20°F). There is no change from the 2012 USDA Hardiness Zone Map which has Hettinger County in also in Zones 4a (-30°F to -25°F) and 4b (-25°F to -20°F).