This year June and I did a fall color trip.  We went over Cottonwood Pass into Taylor Park to Crested Butte.  Then over Kebler Pass and McClure Pass to Marble and Redstone.  Then through Carbondale to Aspen.  Then Independence Pass to Buena Vista and back to Denver.  The biggest problem we ran into was that after labor day weekend in Colorado many National Forest campgrounds are closed.

Weston Pass Area

Buffalo Peaks

Mt Princeton

Cottonwood Pass

Crested Butte

McClure Pass

Erickson Springs Campground

The Raggeds

Marble

Above Marble

Redstone Coke Ovens

Maroon Bells

Independence Pass

East side of Independence Pass