Welcome aboard. I've been solo winter camping in sub zero F temps a few times. It is ok, kinda tough to stay busy but I just go mid morning, set camp up and dottle around to keep my feet warm as day time temps only get into the 20's so it isn't too bad. I now have warmer gear so next time I encounter those temps, I should have warmer feet. My backup is my snowmobile, as I use it once in a while to get to areas only a sled can get in to because of distance. A quick out in the AM too.

Duane