September ultramarathons in Massachusetts, United States

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.

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

Scenic 1.9-mile groomed loop at Notchview with self-timed laps, access to aid station, and options for 50km, 50-mile, or 24-hour challenges

Looped 4.167-mile course through Needham town forest and Rail Trail, starting hourly from Claxton Field Quarry with no road crossings

Double-track trails through tranquil woodlands and past military bunkers, hard-packed earth and gravel, gentle rolling hills, and moderate elevation gain.