Hard ultramarathons in United States (East Coast)

Scenic Kennesaw Mountain course passing historic sites, wooded trails, gravel, and asphalt, featuring sunrise and sunset views along an 8-mile out-and-back loop

Scenic 1.9-mile loop at Notchview with a 0.2-mile climb, rolling single and double track, open fields, and cross-country ski trails

Eight out-and-back segments from a central hub, spanning Vero Beach and Sebastian, with tropical waters, jungles, rugged trails, and 22 bridge crossings

Scenic trail courses in Canandaigua featuring 100-mile and 50-mile ultrarunning challenges

Three-day, 75-mile stage race on the SRKG Greenway with 15,500 feet of elevation gain, technical single-track, steep climbs, and lakeside scenery

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

Out-and-back route through the White Mountains, summiting three 4,000-foot peaks and covering up to 108 miles with 29,000 feet of elevation gain

Demanding forest trails and varied terrain in the scenic Big River Management Area, West Greenwich, Rhode Island

Flat, mostly grassy 2.5-mile loop with gentle hills at Escambia County Equestrian Center, minimal elevation change and easy crew access

Steep climbs and descents, substantial elevation changes, varied trail surfaces, sunrise views, scenic forest singletrack, and a challenging loop format

Rugged mountain trails and challenging terrain in a supportive, community-focused southeastern ultrarunning atmosphere

Challenging out-and-back route from Camp Shenandoah with steep climbs to Elliott and Reddish Knobs, rugged ridgeline trails, and significant elevation gain.

Challenging mountain courses through national forests west of the Shenandoah Valley, featuring fall foliage and panoramic vistas on demanding terrain.

Stunning Wawayanda State Park trails with 100 miler, 100K, 50 miler, and 36-hour race options; generous cut-off times; nonprofit support

Trail ultramarathon festival through the untamed wilderness of Seven Bends State Park

Laid-back loops around Dryden Lake Park with a 7.5-mile course, basic support, shared snacks, and flexible goals of 100 miles or 30 hours

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

10.48-mile pine barrens trail loop in Rocky Point, with ultramarathon distances from 50K to 150 miles and flexible start times

Historic Midstate Trail routes through mountains, fields, and river crossings, with border crossings and New England autumn scenery

Counter-clockwise loop course with centralized aid station, personal pit areas near start, heated restrooms, and chip-timed lap tracking