Early spring (late winter) is when they need the most help as they will be rearing brood and have to maintain warmer temps. I would wait until spring is well underway... but then I wouldn't wrap them in the first place...
You did what? In NC? I know folks in NY who never wrap their colonies. Unless you are in the mountains, I don't see why you would do this. But, if you find that it is of benefit, keep it up.I was wondering at what temp I should take off hive wraps, I wrapped my hive 2 weeks ago when we had some bitterly cold temps in our area.