Hardest ultramarathons

Alpine trails over multiple Swiss cantons, high-altitude routes to Rochers de Naye, ultra-distances up to 100 miles, and finish at Lake Geneva amid live music

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

171 km loop around Mont Blanc with over 10,000 meters of elevation gain, rugged alpine trails, high-altitude conditions across France, Italy, and Switzerland

700 km point-to-point course through the Swiss Alps with 49,000m elevation change and demanding alpine terrain

Multi-stage mountain race across 380 km in Wales, featuring 17,400 meters of elevation change and challenging wild terrain

Alpine trails beneath towering Four-Thousanders, self-paced ultramarathon through Gran Paradiso and Mont Avic parks

Historic Sparta to Thermopylae route across varied terrain and notable altitudes, with support services and village hotel overnight stays

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