It all depends on the snow level. I used to work in Avon and Vail and saw a lot of huge bucks coming down but still in the snow into November. I have even thrown snowballs at huge bucks that were hanging around does during the hunting season just off of paved roads but that area was private.
A lot of the larger bucks will hang up high until they get pushed down by lack of feed but a good area is just off of HWY 131 where they cross from 36 to 35 to get lower. I almost hit a 200+ inch buck one morning headed to Steamboat in my company truck, and that was during fourth season, but the private property around there is thick.
Just this last year I had a fourth season buck tag for 44. I talked to some hunters that were hunting a large buck that was pushing 200 inches. Their only problem was that the buck had moved down from where he had been hanging all summer to the golf course and private property inside of the town limits for the winter. When I watched him just before the season he never did come out into the open where we could get a good look but stayed in the trees.
They don't get big by being dumb