According to the 2023 USDA Hardiness Zone Map Howard County, Arkansas is in Zones 8a (10°F to 15°F) and 8b (15°F to 20°F). This is a change from the 2012 USDA Hardiness Zone Map which has Howard County in Zones 7a (0°F to 5°F), 7b (5°F to 10°F) and 8a (10°F to 15°F).