Hardest ultramarathons in United States

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

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

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

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.

250-mile route from Black Canyon City to Flagstaff across iconic Arizona trails and diverse terrain

Silver Towers, Ripton, Vermont, with routes into the Green Mountain National Forest and ultra distances extending to 551 miles.

200 miles on a 2-mile woodland loop with 55,000 feet of elevation gain, black slate springs, ridge line views, and self-supported aid stations

Point-to-point 300–350 mile trek from a mystery start, self-navigated over highways and byways with maps, limited supplies, and 10 days to finish