Encore Azalea Cold Hardiness

In the more than 15 years that Encore Azaleas have been tested in gardens, trials, and plant nurseries across the Southeast, they have proven to be a low-maintenance solution for multi-season landscape color. University studies and extensive plantings throughout the Midwest and Northeast also show that many varieties are cold hardy through USDA zone 6.

Ten varieties (Autumn Amethyst, Autumn Carnation, Autumn Cheer, Autumn Lilac, Autumn Royalty, Autumn Ruby, Autumn Sangria, Autumn Sundance, Autumn Sunset, and Autumn Twist) consistently exhibited solid cold hardiness throughout Zone 6.

In Zone 6B, 9 additional varieties consistently exhibited solid cold hardiness:

For best results in Zones 6B and colder, gardeners should plant in spring or early summer. In zones 7-9, Encore Azaleas also benefit from fall and late summer planting schedules.

Great for Container Gardening: Encore Azaleas may need special care in zones colder than 6A, but their multi-season blooming capability makes them ideal for container gardens. As a base plant in a container garden, Encore Azaleas can be paired with seasonal favorites, and moved inside when winter freezes threaten.