September ultramarathons in United States (Northeast)

Technical 50K course in Camden Hills with over 7,600 feet of climbing, six major peaks, rugged trails, stream crossings, and panoramic vistas

Mostly flat 50K and 50-mile courses on scenic New England trails at DCR Great Brook Farm State Park, featuring roots, rocks, and fall foliage.

Flat and non-technical twelve-loop 50k course around rural Cherry Hill Farm in Gorham, Maine

Scenic forested loops at Pineland Farms, 4.2-mile double-track trails with moderate elevation changes

Technical 50K on twisty singletrack with roots, rocks, and switchbacks, scenic landmarks including waterfall and caves, 4,500 feet of elevation gain

Scenic 4-mile loop with 500 feet of elevation gain per lap in Sugar Hill State Forest, featuring rolling woodland terrain and Fire Tower Area views

Big’s Back Yard Ultra format: 4.167-mile hourly laps on forest trails, stream crossing, ancient glacial esker, open-field climbs and descents.

12-hour ultrarun on a 5-mile loop with 95% rustic single and double track, slight elevations, flat stretches, flexible pacing, aid stations, and tent areas

Remote Adirondack Park course on rugged trails between Harrisburg Lake and Hope Falls, including East Stony Creek and Willis Lake paths through Wilcox Lake Wild

Challenging course with two steep hill climbs and a covered bridge passage, supported by fully stocked rest stops and motorbike escort.

24-hour rolling singletrack loop through Pleasant Valley, Hilltop, and Sunken Garden trails with 723 feet vertical gain per lap at Moraine State Park

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

Double-loop figure-eight 50K in Pittsfield State Forest, with substantial climbing, fast descents, Taconic Crest Trail, and sweeping vistas.

Rugged mountain ultramarathon at Pennsylvania’s highest point, with substantial climbing, technical trails, and a striking summit setting.

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

70-mile route across the Shawangunk Mountains with rolling hills, wetlands, sky lakes, rare pine barrens, waterfalls, and panoramic cliffside views

Woodland trails and fire roads across rolling hills with technical and runnable sections, featuring 50K and 50-mile courses in South Mountain Reservation.

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