Azalea Bloom Time Zone 5. Plants can achieve a height of five to six feet after 10 years if not pruned to minimize their vertical growth; If autumn is mild, azaleas will often bloom.
Some varieties even bloom again in the fall. Native rhododendron azalea arborescens 'sweet azalea' white with red stamens blooms, zone 5 rhododendron arborescens grows in parts of pennsylvania, west virginia to tennessee, north carolina, georgia and part of alabama. If you are moving and transplanting an existing azalea from the garden, do so in winter when the plant is still dormant.
Some varieties even bloom again in the fall.
There are a few azaleas (such as 'arabesk') in the bloom 'n again series that are supposed to be hardy to zone 5, which would be perfect for me. There is nothing you can do to prevent this. Enjoy the fall blooms, because flowering could be sparse the following spring. Huge white blooms bordered in deep, rich purple;