The North Boundary Trail stretches 6.1 miles from the Cow Creek Trailhead in the northeast corner of Rocky Mountain National Park to the North Fork Trail intersection along the North Fork Big Thompson River. This strenuous, lightly used trail climbs three major hills and crosses several major drainages en route. Visitors will enjoy well-earned solitude, good wildlife viewing opportunities and 3-season accessibility.

Open meadows and promontories near the Cow Creek Trailhead

High open areas along the North Boundary Trail

A band of young bull elk grazing along the North Boundary Trail in late spring

The trail passes through miles of ponderosa and aspen forests

Northwest views of the Mummy Range, some of Rocky Mountain National Park's tallest peaks

West Creek Falls are a worthwhile 1.5 mile roundtrip excursion from the North Boundary Trail

High ridges offer useful perspective on surrounding topography