What varieties of azalea are hardiest in Zone 7?

In Zone 7, some of the hardiest azalea varieties include the Southern Indica hybrids, such as 'Formosa' and 'George L. Taber,' which thrive in warmer climates with good drainage. Additionally, deciduous azaleas like 'Gibraltar' and 'Hilda Niblett' are well-suited for this zone, offering vibrant blooms and good cold tolerance. Evergreen varieties like 'Delaware Valley White' also perform well, providing year-round interest. Overall, these selections can withstand the temperature fluctuations typical of Zone 7.