50mi October ultramarathons in United States

Mountain ultramarathon along the Wasatch Front with 20,869 feet of vertical gain, rugged singletrack, exposed ridges, and scenic canyon trails

Flat, fast point-to-point course along the scenic Hennepin Canal from Sterling to Colona, featuring historic locks, lift bridges, and autumn farmland views

Interconnected North and South shore trails, rolling hills, technical and smooth terrain, roots and rocks, tree canopy and exposed sections in Shawnee Mission  

10-mile loop on Blue Wing, Koasati, and Whoa Mule trails with flat, muddy paths, tree roots, and views of Lake Bistineau and cypress forests

50- or 100-mile clockwise loop around Prescott, linking standout singletrack and backcountry trails across rugged central Arizona terrain

Rugged, remote trails through Shawnee State Forest with steep elevation, untouched wilderness stretches, and demanding technical terrain

Diverse and challenging dirt and single-track trails, panoramic vistas, moderate elevation gain of 1,930 ft (50km) and 4,250 ft (100km)

Extensive USNWC trails, single-track climbs, and riverside paths; 50k or 50-mile options with looped courses and technical terrain; Pump House Biergarten start/

Challenging 50-mile loop through secluded Midwest wilderness with over 10,000 feet of elevation gain and rugged, remote trails

50-mile route from Norco to Huntington Beach, traversing diverse Southern California landscapes with scenic beauty and rugged terrain

Remote gravel roads through Flint Hills prairie, open rangeland, rolling hills, 6,000 feet of climbing, scenic out-and-back and loop sections near Eureka and T.

Multi-day mountain stage race around Spruce Knob, with 50k and 50-mile options, rugged Appalachian trails, big elevation, and remote high-country terrain.

Scenic rails-to-trails course along the New River with vibrant fall foliage, historic train trestles, gentle dirt and crushed gravel path, and minimal elevation

Rugged singletrack and rolling terrain on looping courses through hardwood forests and around kettle lakes at Chain O’Lakes State Park

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

Paved, illuminated 2-mile loop with minimal elevation at Sparks Marina, featuring lakeside scenery, sandy beaches, and flexible distance or timed challenges

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

Scenic road loop circling a Finger Lake, mostly flat to rolling terrain with challenging climbs including the renowned Bopple Hill

Flat, fast crushed limestone trail winding through forests and wetlands with bridges, minimal road crossings, and occasional water from flooding

Smooth single track through golden larches, with demanding ascents over 6000–7000 feet and views of the Entiat River Valley, Clark Mountain, and Glacier Peak