Like every other season, fall is pretty magical in the Colorado high country. By the end of summer, cool winds are already moving over the mountains and the peaks are getting dusted with snow. The aspens shed their leaves, covering the trails in red and gold, and morning frosts dampen the dry summer dirt. Add it all together, and it means several weeks of absolutely prime singletrack—sticky, colorful, and emptied of the summertime foot traffic. It was in search of those conditions that we headed into the mountains with our SB66s and a checklist of our favorite trails.