I scouted possible routes from Fort Collins to Albuquerque NM in several forms, but alas never made that ride. Going out of Denver through Evergreen and Buena Vista is doable but only with good weather. My absolute favorite option was to get someone to drop me in Leadville and bomb toward Antonito, Espanola, and Albuquerque. Its just getting to Leadville on a bike that was the problem. The grand circle through Rocky Mountain NP should be high on your list and it is doable if you are in shape. Happy riding. tom