“A late-to-open trail made better by the multiple highlights along this route.
— Tom Robson
Fall Colors · Lake · River/Creek · Views · Waterfall · Wildflowers · Wildlife
Campfires are not allowed. Camping at Diamond lake is limited to designated sites only. Permits required for overnight stays inside the Indian Peaks Wilderness from June 1 - September 15.
The Diamond Lake Trail forks left from the Arapaho Pass Trail
and drops 0.5 miles before crossing the North Fork of Middle Boulder Creek. Diamond Lake is located a mile further uphill from the bridge and scenic waterfall. This stretch of trail is on a northeast-facing aspect and holds snow during June and into July. In fact, those without orienteering skills that venture on the trail too early discover the lake impossible to find.
Continuing straight and passing the Diamond Lake side trail, the main trail continues for 2.4 miles, and climbs up to cross the ridge just above tree line. The drop to tree line may be difficult to find. There are piles of rock (cairns) at the edge of the trees. The Diamond Lake Trail joins the Devils Thumb Trail for access to Jasper and Devil's Thumb Lakes.