6hr ultramarathons in United States (West)

Scenic alpine 10K loop with 1,546 feet of vertical gain per lap, technical trails through aspen groves and meadows at Powderhorn Mountain

Looped 1.3-mile course featuring trail, grass, and bike path segments in Montgomery Waller Community Park, near Imperial Beach and Chula Vista

Scenic loop route on dirt fire trails with modest elevation gain and classic trail ambiance

Non-technical 2.6-mile gravel loop around Lake Padden with 150 feet of elevation gain, winding through classic Pacific Northwest forest scenery.

Morning trail run on single and double track paths at Thomas F. Riley Wilderness Park, surrounded by Orange County scenery

1-mile loop on hard packed dirt, grass, gravel, and asphalt in Bush’s Pasture Park, gentle terrain with central aid station and accessible crew area

Time-based ultrarun in Napa's Skyline Wilderness Park, 4.16-mile trail loop with 815 feet of gain per lap through rolling hills and historic landscapes

Scenic 2-mile loop featuring flat beachside paths, demanding forested single-track climbs, Puget Sound views, and local wildlife sightings

Flat 500-meter USATF-certified crushed gravel loop at Nardini Manor, overnight hours on scenic, illuminated grounds

Flat, fast 1.68-mile gravel loop at Missoula County Big Sky Park, with minimal elevation change and wide-open mountain range views.

Flat 3.1-mile loop on gravel, dirt, grass, and paved surfaces at Kearin Family Farm, with central aid and easy crew access for ultradistance challenges.

Timed ultra on a 1-mile loop at Donald Farm, shifting from Warrior Expo crowds by day to a quiet overnight test of persistence.

Trail route through Mendocino Woodlands State Park with forest scenery, tent cabin options, and meals included on Saturday

Scenic, flat 1.05-mile loop with ultra-distance options and generous time limits, designed for fast times and all experience levels

Looped 0.85-mile paved bike path through scenic Auburn, with picturesque ponds, shaded stretches, and multiple distance options

Rugged Arizona Snowbowl trails with alpine scenery, technical paths, and relentless elevation gain up to 11,500ft on steep mountain loops.

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

Rugged Mount Bachelor alpine trails with steep climbs, high-elevation terrain from 7,280 to 9,027 feet, runnable lower sections, and festive aid stations.