Tami,
One winter I was traveling through December and January. I bare rooted my (about 40 that were shorter than 3') trees, wrapped the roots in damp paper towels and aluminum foil, then let them go dormant in the fridge (you can tell I am single). Other than this, the only other time I remember bringing trees in was before Hurricane Katrina (I left them all before fleeing ahead of Ike). Most winters my trees would lose their leaves and go into a quiet state without really going dormant. It is not cold enough and there is still a lot of light. The terminal buds would normally stay green.
I was about 20 miles from the coast in a subdivision. It is possible/probable for your climate to be slightly different. You are further south than I was, but that does not guarantee it will be safer for trees during winter. My guess, based on what I have experienced, is there will be very few, if any, days you will need to protect your trees from winter weather.
For those growing in similar climates, this is why I recommend doing root work (or plant trees in ground) in late fall / early winter. The container/ground temps will generally stay within the preferred temp range for root production. When spring comes,the trees have reestablished their roots before the top begins to grow. This is nice, since top growth slows down during the hot, summer months.