The best fall color I have seen in 54 years of living in Colorado was the first weekend of October 2016 on Cumbres and La Manga Passes on CO 17. For a photo and more details, see the US 285 post on my new blog
HERE. We (the Denver MG Car Club) were in Chama that weekend to ride Galloping Goose #5 over Cumbres Pass on the C&TSRR. You can watch a 14-minute video of our trip
HERE, if you want to see some of that color on our way up the pass.
Interestingly, there were 25 1912-1922 Rolls-Royce Silver Ghosts in Chama the same day because they were riding the train through the fall aspens that weekend too. If you want to see a video of me driving a 1913 Silver Ghost, take a look
HERE. I am the one on the right side of the car behind the steering wheel (it is an English car of course!).