50mi ultramarathons in United States (Southwest)

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

Demanding 50-mile course through Uinta-Wasatch-Cache National Forest, trails and minor roads, mandatory pack weight, 26-hour limit, scenic mountain terrain

High-altitude 50-mile out-and-back over dirt, rocks, and mud with challenging climbs, fast descents, and views of Leadville’s historic mining district

Scenic nighttime route along Tulsa’s RiverParks asphalt trails, illuminated Arkansas River crossings, urban landmarks, and riverside views

50-mile route from Bear Creek Regional Park through High Drive, Cheyenne Canon, and notable landmarks including Seven Bridges and Helen Hunt Falls

Technical trails across the flat-topped Grand Mesa, high-altitude forests, alpine meadows, lakes, and streams

Marathon and 50-mile races through the scenic southern Sangre De Cristo mountains, finishing with a Tooth of Time Ridge descent to Base Camp in Cimarron

High-altitude courses over 10,600 feet, technical trails and remote forest service roads, striking mountain views, and challenging wilderness terrain

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

Scenic 50-mile loop through Upper Logan Canyon, starting and finishing at Beaver Mountain Ski Area, featuring segments of the Bear 100 course

Challenging 50K and 50M trail races in Roxborough State Park with steep climbs, technical terrain, minimal shade, and substantial elevation gain.

50-mile point-to-point run and relay through Ashley National Forest, from backcountry campground to Remember the Maine Park, with mountain views.

Scenic 2-mile loop at Harvey Bear Ranch with hill and mountain views, multiple distance options, generous cutoff times, and a community-focused environment.

Over 20,000 feet of elevation gain on rugged alpine trails through the San Juan Mountains, culminating with a steep ascent to the Bridge of Heaven.

Challenging technical trails and scenic views across a vibrant 1400-acre venue on Labor Day weekend, featuring trail runs, mountain biking, and outdoor festival

Flat 2-mile loops on the Bonneville Salt Flats from sunset to sunrise, overnight relay or solo effort under starlit skies

Mountain routes through Routt National Forest and Emerald Mountain, signature climbs and descents, autumn scenery, 9,000–22,000 feet of elevation gain

Looped 0.85-mile paved bike path through scenic Auburn, with picturesque ponds, shaded stretches, and multiple distance options

High-elevation single-track trails between 7,000 and 9,000 feet, featuring 100-mile and 50-mile distances on rugged terrain.

High-country ultramarathon with 50 Mile and 50K routes on singletrack and dirt roads, challenging climbs, moose-filled forests, and sweeping mountain views