What hardiness zone is Phoenix in the usda format?

Phoenix, Arizona, is primarily classified in USDA hardiness zones 9b and 10a. Zone 9b has minimum temperatures ranging from 25 to 30°F (-3.9 to -1.1°C), while zone 10a ranges from 30 to 35°F (-1.1 to 1.7°C). This warm climate allows for a wide variety of plants to thrive in the region.