According to the 2023 USDA Hardiness Zone Map Bitter Springs, Arizona is in Zones 6b (-5°F to 0°F), 7a (0°F to 5°F), 7b (5°F to 10°F) and 8a (10°F to 15°F). This is a change from the 2012 USDA Hardiness Zone Map which has Bitter Springs in Zones 7b (5°F to 10°F) and 8a (10°F to 15°F).