Hardest ultramarathons in North America

Looped mountain course in Summit County with single track trails, forest roads, and recreation paths, over 40,000 feet of elevation gain above 9,000 feet.

420-mile route from Salt Lake City to West Yellowstone, mostly paved roads with 50 miles of dirt, expansive terrain and multi-day endurance challenge

Demanding 200-mile course tracing the Continental Divide through Castle, Crowsnest, and Flathead; remote alpine terrain, technical sections, sweeping mountain  

203-mile Ohio road ultra from Lake Erie's Walnut Beach to Wellsville, featuring mountain foothills, rolling hills, Amish country, and industrial towns

Out-and-back 200-mile trail route along the Middle Fork Willamette and North Umpqua rivers with 23,000 feet of elevation change and extensive crew access

Rugged southern Rockies course on the Great Divide Trail, featuring Castle, Crownest, and Flathead regions with bushwhacking, scrambling, and minimal flagging

Rugged 200-mile route across Canadian Shield and coastal Algoma, featuring singletrack, bushwhacking, dirt roads, beach sections, and difficult navigation

Point-to-point courses from Niagara Falls and Cranberry Lake, traversing the Adirondacks to Lake Champlain, with distances from 100 to 420 miles.

Rolling terrain on the Rainbow Trail beneath the jagged peaks of the Sangre de Cristo mountains, along the Southern Colorado Rockies wilderness boundary.

240 miles across expansive deserts, dramatic canyons, rugged slick rock, and two mountain ranges through Canyonlands and Arches National Park

Rugged loops around Lake Perris with 2,300 to 4,500 feet of elevation gain, lake and mountain views, frequent aid stations, and camping on site

Diverse 200-mile route across Florida with Florida Trail, State Park, dirt roads, Rails to Trails, rolling hills, and a finish at St. Augustine Beach Pier

Snow-covered Yukon Quest trail from Whitehorse, crossing remote wilderness to Dawson City, multiple race distances, famed for Arctic extremes and challenging, h

33-mile loop at Shelby Farms with paved paths and flowing single-track, circling lakes and wooded sections; 100-, 200-, and 300-mile options.

Rugged point-to-point mountain trail ultra on the Pinhoti Trail: 200+ miles, nearly 28,000 feet of climbing, finishing atop Mt. Cheaha.

200-mile repeat-loop course on compacted dirt trail with roots, rocks, and gravel road bed, passing mill ruins and quiet woodland at Sweetwater Creek.

304-mile point-to-point route through Sonoran Desert wilderness, remote backcountry trails, high-elevation mountains, and diverse arid landscapes

Multiple ultra distances on a 10-mile single-track loop with rolling hills, prairie, creek crossings, 1,600 feet elevation gain per loop, and frequent aid stops

Technical trails and rolling double-wide paths across the Cohutta Mountains, 5,000 feet of elevation gain, clockwise and counter-clockwise looping, Pinhoti deto

232-mile point-to-point road journey across Ohio on public roads, with a self-reliant format and resupply through towns along the route.