According to the 2023 USDA Hardiness Zone Map Madison, Indiana is in Zones 6a (-10°F to -5°F), 6b (-5°F to 0°F), 7a (0°F to 5°F) and 7a (0°F to 5°F). This is a change from the 2012 USDA Hardiness Zone Map which has Madison in Zones 6a (-10°F to -5°F) and 6b (-5°F to 0°F).