100mi road ultramarathons in North America

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

Rugged high-altitude ultramarathon through State Forest State Park, with alpine lakes, rocky ridges, remote trails, and 14,500 feet of elevation change

Flat 3.75-mile paved loop at Cooper River Park with Philadelphia skyline and waterfront views, easy pit access, and some rubber track sections.

Challenging 100-mile urban route through vibrant Miami neighborhoods, historic districts, farmlands, and scenic spots; navigation-based, no aid stations

Point-to-point and out-and-back ultramarathon across Michigan’s lower peninsula, with varied single-track, gravel, limestone, and seasonal road terrain

Multi-distance road ultramarathon on a 3.34-mile loop through Hawaii Kai, featuring out-and-back segments and hydration stations at Kalama Valley Park

USATF-certified 1.0-mile loop around Cottonwood Lake with lake views, challenging endurance events including 24 Hour Solo and 100 Mile distances

Five 20-mile road loops through Oak Mountain State Park, 24-hour format, solo or relay, festival atmosphere, opportunities for recovery and learning

Certified 1.2-mile loop with gentle elevation, 95% hard surface, scenic lake and bridge crossings, and generous time limits in Henderson, Nevada

Scenic route along Pistol Creek in East Tennessee, with a lit course and a friendly, community-driven atmosphere

Point-to-point 100-mile and 100K road ultra along the Outer Banks: flat, exposed coastal roads, ocean views, strong winds, and notable bridges.

Ultra-distance courses along the Poudre River Trail from Watson Lake to Greeley, featuring scenic Northern Colorado landscapes and aid stations.

Scenic lakeside and woodland trails through rolling terrain in Midlothian, Virginia with a 4.167-mile Backyard Ultra loop under open skies