According to the 2023 USDA Hardiness Zone Map Lake County, Minnesota is in Zones 3a (-40°F to -35°F), 3b (-35°F to -30°F), 4a (-30°F to -25°F), 4b (-25°F to -20°F) and 5a (-20°F to -15°F). This is a change from the 2012 USDA Hardiness Zone Map which has Lake County in Zones 3a (-40°F to -35°F), 3b (-35°F to -30°F), 4a (-30°F to -25°F) and 4b (-25°F to -20°F).