According to the 2023 USDA Hardiness Zone Map Kauai County, Hawaii is in Zones 10a (30°F to 25°F), 10b (35°F to 30°F), 11a (40°F to 35°F), 11b (45°F to 40°F), 12a (50°F to 45°F), 12b (55°F to 50°F) and 9b (25°F to 20°F). This is a change from the 2012 USDA Hardiness Zone Map which has Kauai County in Zones 10a (30°F to 25°F), 10b (35°F to 30°F), 11a (40°F to 35°F), 11b (45°F to 40°F), 12a (50°F to 45°F) and 12b (55°F to 50°F).