Longs Peak Trail to the Boulderfield

This is an 11.6-mile round trip from Longs Peak Trailhead to the Boulderfield, gaining about 3,360 feet and reaching roughly 12,760 feet. It is a strenuous, all-day hike on the maintained approach, not the summit route. Plan around 10 hours for the return outing, with your own pace and acclimation in mind. The campground information gives a five-to-eight-hour travel estimate but does not make clear whether that includes the return, so do not use it as a round-trip schedule.

The trail climbs steadily through forest before the views open above treeline. Near the end, a high, broad basin of broken rock sits beneath Longs Peak’s steep face. The boulderfield makes the payoff feel alpine long before the Keyhole, but the climb is sustained and the altitude is part of the effort.

The Boulderfield sits around 12,760 feet. Boulder Brook runs among and beneath the rocks, and the campground has a privy and nine designated sites in rock rings. Treat or boil water from the brook. From the established path, include boulders in the foreground to show the scale of the mountain face; there is no need to leave the trail for a photo.

This hike ends at the Boulderfield campground. Past it, the maintained path gives way to boulder-hopping toward the Keyhole; the summit route then crosses exposed Class 3 terrain. That is a separate, much more hazardous outing. Turn around at the campground unless you have deliberately planned for the Keyhole route and its demands.

Longs Peak Trailhead is beside the Ranger Station at the end of Longs Peak Road. The small lot can fill early during the climbing season, and visitors report roadside overflow; plan to park only where permitted. The finish is above treeline, where lightning and fast-changing weather are serious hazards. Carry enough food and water for a long day, and do not count untreated Boulder Brook water as ready to drink. Pets are prohibited on park trails.