Hard ultramarathons in United States (West)

High-altitude trails above 10,000 feet through alpine meadows, ghost towns, and mining relics, with sweeping views of the South Park Valley and Decalibron peaks

102.5-mile loop in Colorado's San Juan Mountains, 33,000 feet of climbing, 13 mountain passes, technical terrain, summit of Handies Peak at 14,048 feet

175-mile relay from Twin Bridges to Virginia City, 10,000 feet of elevation gain, mountain terrain, big sky vistas, and pristine forests

High desert landscape with intense heat, steep gulches, massive rock hoodoos, significant elevation changes, and dry, challenging terrain

Steep, technical 100-mile route through Colorado’s rugged San Juan Mountains, renowned for extreme difficulty and a strict no-frills ethos

101-mile loop in Colorado’s Sawatch Range with 23,500 feet of climbing, high alpine passes, ghost towns, and sweeping ridges on the Continental Divide

100-mile course with 23,000 feet of elevation gain, 32 miles on the Pacific Crest Trail, and a 2.3-mile section through Snoqualmie Tunnel

Mountain trails from John L Harvey Stadium to Snow Valley Peak and Tahoe Rim Trail, featuring Ash Canyon climbs, remote aid stations, and Ultra Lounge finish

Point-to-point course from family ranches through Apsaalooke lands, private forests, jagged cliffs, scree fields, high alpine lakes, and wild mountain terrain

Backcountry courses in the Pioneer Mountains featuring rugged trails, steep ascents up to 11,000 feet, long aid station gaps, and alpine scenery

Historic National Recreation Trail between Hope and Cooper Landing with rugged terrain and scenic vistas along old gold mining routes

San Juan Mountains singletrack, Bachelor Loop, North Clear Creek Falls, two Continental Divide crossings, above 12,000 feet, historic mining scenery

135-mile route from Badwater Basin to Whitney Portal crossing three mountain ranges, 14,600 feet of ascent, desert heat, and iconic California scenery

100-mile lollipop-style mountain trail route, 17,700 feet of ascent and descent, varied Mt. Hood terrain, finish beneath the volcanic summit

Remote San Gabriel backcountry route through preserved wilderness, featuring picnic spots, campgrounds, and a demanding 100-mile ultrarunning course

Unmarked 90–105 mile route through the San Juans, over 40,000 feet of climbing, five 14er summits, and self-chosen path between checkpoints

High-altitude 100-mile route through the La Sal Mountains with approximately 21,000 feet of climbing and descending

200-mile point-to-point route from Mount St. Helens, traversing volcanic terrain, mountain ridges, old-growth forests, and numerous streams to Randle, WA.

Scenic Rio Grande River start and finish, La Garita mountain trails, alpine tundra crossings, four peaks over 12,000 feet, golden aspens, rocky terrain