So many variables. If bugs, rain, snow, really cold nights, mice, snakes, scorpions are an issue, I’d go with tent with a floor. For those rare early fall nights in the mountains with none of those issues, you could sleep right on your air mattress. A simple tarp over your bag will keep the frost off you. I look at it, if I need a tent, I need a tent with a tent with a floor.
To the OP. I live in CO. I think in 20 years of archery and rifle hunts I’ve only had one where Mother Nature didn’t dump rain or snow on us. And it’s almost always snow in the mountains. A wet sleeping bag would cut the trip short.
