lost 1 out of 9 so far. Not the one I expected but they obviously had not built up in the fall, tiny cluster that froze. Oh well.
Of all my hives, some will fly when it is sunny and 25, I don't think they make it back, but I can tell they are alive by the dead bees in the snow in front of the hive. Some hives won't fly till it is warmer. Some will fly when cloudy and in the high 30's, some won't.