12hr trail ultramarathons in United States (Southwest)

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

2km out-and-back laps on the Thumb Open Space trail, with 540 feet of climbing each lap and a sustained focus on vertical gain.

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

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

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

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

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

1-mile loop on private desert land near Joshua Tree, 12-hour format, high desert scenery, festive atmosphere, well-stocked aid each lap

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.

Night trail loops under the brightest full moon, marked courses of 3.3 or 4.17 miles, 8-hour lap challenge and 12-hour Last Runner Standing format

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

Varied Skyline Park trails with multiple 4.1-mile loops, 815 feet of elevation gain per lap, fire roads and singletrack, run at own pace

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

Looped golf course circuit with rolling fairways, cart paths and lakeside stretches, framed by Sierra foothills and Central Valley orchards.

2-mile double track dirt loop with 128 feet of gain per lap, mountain desert scenery, starlit night running, camping on-site, real bathrooms and aid station

Lap-based ultra in Montezuma County’s high desert with steep climbs, rocky descents, and views of Mesa Verde and Sleeping Ute Mountain.

Challenging 4.6-mile loop on private trails near Baum Lake, surrounded by fall foliage, wildlife, and scenic views