I found the following post on it:
"Azalea (Rhododendron mucronatum) 'Sekidera' var. 'Indica Rosea' - Grown as far north as Long Island, NY, before the Civil War. 30-50 year old plants are not uncommon in old southern gardens. The large flowers are lavender with a large rose blotch. In mild climates blooms in winter, followed by a prolific early spring bloom. Petal Blight resistant. Semi-evergreen."

This scarce and unusual mucronatum hybrid developed by the late Roy Matlack in Arlington, Virginia, and introduced by Norman and Jean Beaudry after his death. It is being distributed under the name "August to Frost".

August to Frost is hardy in zone 7, Richmond, VA, and Washington DC area. Several people have tried it north of that. Jim Gears of Octoraro Nursery in Nottingham, PA near the MD border (zone 6b) raises it. Roslyn Nursery of Dix Hills, Long Island, New York (zone 7a) - www.roslynnursery.com - rates the plant at -5F.

Thanks much for this great info.
It may do well for me in South Central PA.
I'll make sure to give it winter protection.
Thanks again!