100mi trail ultramarathons in United States (Northeast)

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

Rugged, moderately difficult out-and-back laps on an unpaved rail trail with 1000 feet elevation change per lap and uneven terrain.

100-mile Vermont trail race with 17,000 feet of elevation gain, rolling hills, country roads, forested trails, and southern Green Mountains scenery

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

103-mile loop through Pine Creek Gorge and the Grand Canyon of Pennsylvania, with over 20,000 feet of climbing, rugged singletrack, and remote wilderness trails

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

Flat, scenic miles along the historic Erie Canal towpath, starting at Wide Water’s Marina and crossing Lockport’s draw bridges

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

Scenic loop course through woodlands and fields, quasi-technical trails with 300 feet elevation gain per loop, wooden bridges, and stream crossings

Wide crushed stone rail trail through Pine Creek Gorge with dramatic cliffs, abundant wildlife, early autumn foliage, and gentle 2% grade

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

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

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

104-mile out-and-back on Westmoreland Heritage and West Penn Trails, 7,392 feet of elevation gain, Morosini Reserve and parks in peak autumn colors

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

Rugged single-track ultramarathons on the Gerard Hiking Trail, with over 17,000 feet of elevation gain through Oil Creek State Park's scenic, demanding terrain

Historic rail trail through New Hampshire forests, autumn foliage tunnels, weathered railway remnants, and night miles steeped in lore and legend

6.5-mile loop in Vermont's Green Mountains with 1200 feet of elevation gain, expansive views, and variable winter conditions