Those later seasons are close to, or in the rut for sure. But the weather could be problematic so plan accordingly.
I did an early high country rifle hunt a couple years back and wound up hiring a drop camp outfitter. Packing into one drainage, getting a buck, then getting home isn't that big a deal. But spending days and days hopping from drainage to drainage potentially moving camp at 12,000+ elevation was something I realized I could not do after a scouting trip or two. I'm not sure your age or fitness level, but please be realistic. That elevation is no joke. I had a blast, got a decent buck, and do not regret getting packed in and out. You are correct about 3 seasons running simultaneously, no shortage of humans in most all CO backcountry anymore. But, I got my buck 500 yards off a popular hiking trail, at 12,500-ish feet, mind you. But I think I felt more pressured than the bucks did.
Good luck!
