I saw a picture of a double nuc that was sitting on a ten frame deep box. The box was acting as a hive stand. I think the picture was one of Mike Palmers, but not sure. But it did trigger a thought about the ground keeping the girls warm. If that box was buried half way, and maybe a post hole under it and an inner cover on that or even a screen on it with the brood box sitting on that, would that keep them from freezing. Maybe if you also wrapped the hive. Just a thought. Has anyone heard this before, done it?