We find the deer at the edge of tree line. Thats pretty well everywere but the tops of the highest peaks. I believe the deer stay till the snow pushes them down.
You will need water to stay and hunt so thats a concern, but there are seeps and springs everywhere, just plan accordingly and bring a filter. You will want to camp where water is not too hard to get, but absolutely do not camp in the middle of the meadows the deer feed in. You will kill your hunting. Hide your camp in a hole somewhere that the thermals wont carry your sent right into the meadows you plan to hunt. Pretty well every year great meadows where we hunt are ruined by clueless hunters.
For the most part the deer's september routine is alot like august except they tend to be a bit more reclusive, stay closer to cover, and primarily go out in the openings for early morning and late evening feedings. You need to glass hard first light trying to catch them up and feeding in the open, then through the mid day you glass cover looking for bedded deer and trying to catch them shifting beds, then for last light its glassing the openings again till dark. The high hunt isnt about seeing alot of animals or hunting alot of ground. Its about long hours of glassing, being low impact/non intrusive, and patience.
We try very hard to not spook them and not enter thier bedding and feeding areas. If you bump them it seems its 2 days or so till they come out again. We tend to stay high up in the rimrock and glass from afar and then plan to shoot long range or stalk closer. If unpressured we often spot the same bucks feeding in the same openings several days in a row.
The bears are there for the berries. Pretty self explanatory there.