Hardest ultramarathons in United States (East)

Ferry start on the Mississippi, 314 miles across highways, backroads, and summer heat from Missouri to Georgia, fully self-supported

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

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

Multi-day ultramarathon series including a 200-mile, 100-mile, and 100 km race, with staggered starts and challenging distance courses.

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.

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

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