6hr 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

Steep switchbacks in lush forests, ski slopes with panoramic vistas, and expansive fields across a 5-mile loop with 810 feet of elevation change

Rolling grassy hills on a compact cross country loop with team relay format, dusk headlamps required, and awards for most laps completed

1.776-mile loop through historic Putnam Memorial State Park, featuring multiple timed race options in a landscape tied to Revolutionary War history

Randomly assigned trail loops across South Mountain Reservation, strategic decisions at dusk, and unpredictable routes inspired by the TommyKnocker Ultra

Flat .8-mile park loop with pavement or gravel options, timed format, personal gear area near start/finish, accessible terrain in Westfield, NJ

Scenic Colt State Park loops with pavement, rooty trails, and grass; mostly flat terrain, waterfront views, frequent aid stations, summer heat challenge

Scenic Chester, VT loops on single, double track, and Jeep trail; 1.8 miles with 200 feet climb per lap; six or twelve hour timed format

Wooded mostly singletrack loops at historic Tilden Hill Farm, with very little elevation change and an endurance-focused, low-key atmosphere.

Jug End Loop Trail course with woods, fields, apple orchard, and 830 feet of elevation change per 4.2-mile lap; moderately challenging terrain

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

5-mile loop at Camp Mack with 876 feet of elevation gain, combining wide track, single track, dirt, and gravel; course reverses direction during the event

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

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

Technical single-track and double-track trails along Unami Creek, with rocks, roots, mud, varied elevation, and scenic woodland terrain at Camp Hart.

One-mile grass and trail loop with minimal elevation at a reindeer farm; reindeer, chickens, and maple trees add to the unique farm scenery.

Set distance trail loops over 24 or 12 hours, festival atmosphere, support stations, belt buckle awards for 100+ mile finishers