The Red Feather Trail Jamboree is a three-day trail event that offers all participants the option to run a 50-mile, 50k, and/or a half marathon. Trail Runners. Largely smooth dirt trails, the Red Feather Trail Half Marathon is moderately challenging, with small climbs throughout the moose-heavy forest and fields. Encouraging all eager participants to join in enjoying the fresh air and wild landscapes of the Red Feather Lakes region in beautiful Northern Colorado, this course has something for everyone, from foliage and mountain ranges to streams and creeks.