on a mad whim we went to Lake Louise with our camper for some skiing and snowshoe hikes. Temps -35 to -38 overnight for a week. Had the entire campground to ourselves for a couple of nights but as the weekend approached a few other hardy souls showed up.
Full disclosure, we had shore power and were parked next to a heated shower building, so we weren't off-grid. Not sure I'm ready for that yet!