Arctic Dawn is another zone 6 Camellia that can handle some cold weather. It blooms early as well. Dont forget to check out the 'more info' above the map for all Camellia, Rhododendron, Mountain Laurel, and Azalea.
Be sure to use a well drained soil medium when planting any Camellia as they prefer fall planting with less watering than you might think. In NC our soil is clay so we prefer to use pine bark soil conditioner when planting Camellia, Rhododendron, Mountain Laurel, and Azalea.