Hard ultramarathons in United States

Scenic Kennesaw Mountain course passing historic sites, wooded trails, gravel, and asphalt, featuring sunrise and sunset views along an 8-mile out-and-back loop

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

Scenic 1.9-mile loop at Notchview with a 0.2-mile climb, rolling single and double track, open fields, and cross-country ski trails

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

100-mile road race featuring self-support requirements, minimal aid, and extreme endurance demands across a remote course with limited replenishment points

Eight out-and-back segments from a central hub, spanning Vero Beach and Sebastian, with tropical waters, jungles, rugged trails, and 22 bridge crossings

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

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

Scenic Illinois River trails with 100 mile, 100k, and 50k options; roughly 23,500 feet of elevation gain and rustic woodland terrain at Camp Wokanda

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

Mountain trail ultramarathon in Cherokee National Forest with technical terrain, scenic views, and up to 19,000 feet of elevation gain

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

Point-to-point ultra distances of 56 and 107 miles through rugged Badlands terrain, technical trail sections, rolling hills, and sweeping North Dakota vistas

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