Hallett Peak, in Rocky Mountain National Park, is very distinctive when viewed from the east side of the park with it’s slanted square structure towering over the landscape. As you near the summit however, the square melts away and you are left looking at a more traditional mountain silhouette. Rising along the Continental Divide, Hallett Peak divides Chaos Canyon to the south and Tyndall Gorge to the north.
The route to the summit first requires reaching the summit of Flattop Mountain on a well maintained trail. The Arapaho Indians called the Flattop Mountain corridor “The Big Trail”. At one time the Flattop Mountain Trail was also known as the Grand Trail. A pathway was formally constructed in 1925, was rehabilitated by the Civilian Conservation Corps in 1940, and is now currently listed on the National Register of Historic Places.
Trailhead: Bear Lake
Round trip: 10 miles / 16.1 km
Elevation: 9,475′ – 12,713′ (+3,238′)/ 2,888m – 3,875m (+987m)
From Bear Lake take the well maintained Flattop mountain trail to the summit of Flattop Mountain. No maintained trail reaches Hallett Peak, so cross the saddle above Tyndall Glacier and scramble up steep talus to the summit.