Just apply the information from the posts others provided and you will be fine. I'm about 2 1/2hrs from you, just west of Raleigh. My chooks survived the freak -9 of 1984, the 8" ice storm of 1988, the 8" ice storm of 1996, and the 24" freak snowstorm that we got in January of 2000. I've never lost a chook or any of their chicks due to cold winter weather. They are tougher than we give them credit for. I keep mine fed good, and a place to get out of the wind and inclement weather.
Marty
Marty