Day HikeModerateFront RangeHikingFamily FriendlyMountain
Mount Sanitas Loop
Boulder's quintessential after-work workout hike — a steep 3.4-mile loop with continuous views of the Flatirons and the city below.
Distance5.5 km
Duration1 days
Gain410m
Max Elev2,092m
DifficultyModerate
TypeCircuit
SeasonYear-round; spring and autumn ideal
Trail Weather
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Mount Sanitas is the closest summit to downtown Boulder and one of the most-used trails in the state. The classic loop combines the steep, rocky Sanitas Trail (1.3 miles up to the summit), the East Ridge descent, and the Sanitas Valley Trail return — totaling 3.4 miles with 1,343 feet of elevation gain. The summit at 6,863 feet offers a 360-degree view of the Flatirons, the Indian Peaks Wilderness, and the city of Boulder. Heavily traveled at sunrise and after work, the trail is rarely solitary but remains a Boulder rite of passage.