October ultramarathons in United States (West)

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

One-mile hard-packed dirt loop with direction changes every four hours, frequent aid stations, and personal camp support throughout timed ultra options.

Rugged 100-mile route through the San Gabriel Mountains' primitive wilderness, featuring rough terrain and scenic, largely untouched backcountry

214-mile loop race around Mammoth Lakes, spanning the Eastern Sierra with 9,346 m of climbing over five days and a 108-hour cutoff

Challenging 50k course with 6,300 feet of elevation gain, single and double-track terrain, and a summit ascent on Montana's Whitefish Trail

Rocky bluffs, sandy beaches, old-growth rainforest, and headlands with Pacific Ocean views in the Cape Perpetua National Scenic Area

Historic Uravan Ballpark start and finish, abandoned mining roads, desert single-track, canyon passages, slick-rock, and river confluence views

360-degree mountain views in Hartman Rocks Recreation Area, technical slickrock, smooth singletrack, doubletrack, and sagebrush hills

Diverse terrain from dense forests to alpine areas, steep climbs and demanding descents, 7,000 feet of elevation gain, reaching 8,550 feet high point

Double out-and-back route on asphalt, gravel, and dirt trails with over 10,000 feet of elevation gain through Stub Stewart State Park and Vernonia Lake

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

Colorado fall colors, views of Pikes Peak, Lovell Gulch climbs, Rampart Range Road, singletrack near Rampart Reservoir, National Forest mountain vistas

Three-loop course through Cuyamaca Rancho State Park, summiting Cuyamaca Peak, circling Oakzanita Peak, and running PCT segments with desert views.

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

Long-distance route along the Baker Lake Trail with Mt. Baker views and trailside scenery in the Baker Lake Recreation Area

Expansive Castle Rock trails and Ridgeline Open Space, soft single and double track, scenic butte views, and optional 200-step Challenge Hill finish

Flat 1-mile loop along a lakeshore, sunrise views, mixed weather conditions, wildlife sightings, and a self-supported, low-key atmosphere