In order to protect them from mishap, I package my cupcakes in the larger ziplock plastic containers. We have not had to keep them frozen for more than a couple of weeks. I would suggest waiting a little closer to Christmas, if you can. If not, maybe wrap the containers in plastic wrap, also. Before freezing our cupcakes, we test it in the freezer, first. We have found some recipes do better in the freezer than others. Keep them frozen for a week, thaw a couple and then taste test for moistness.