24hr ultramarathons in United States (West Coast)

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

Track-based ultra at Newport High School featuring 24-hour, 12-hour, and 50K distances, with 125 laps marking the 50K finish

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

Last-person-standing format inspired by the original Backyard Ultra concept, testing endurance through successive timed laps

Nighttime loops on a 1.58-mile dirt and wood chip trail, with options for 50K or 24-hour distances, self-supported format, running or rucking

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.

Demanding 2-mile loop with 320 feet of elevation gain per lap on varied terrain, 24-hour and 12-hour ultramarathon options, open field event hub with full aid

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

10 km dirt singletrack loop on a private cattle ranch, moderate climbs and sweeping views, well-stocked aid stations, overnight camping and evening bonfires

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.

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

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

Mixed trails and pavement loop, cultural celebrations, and options from 12 to 48 hours with finisher medals and belt buckles for milestone distances

Rugged mountain hills, fire roads, and single-track trails through the Anza-Borrego Desert with alpine loops among junipers, pines, and oaks

Scenic 1.3-mile loops through lush evergreens and coastal views, plus a Last Runner Standing challenge with steep Striped Peak climbs and WWII history

3.6-mile forested loop around Suttle Lake with 110 feet of elevation gain, soft trails, some roots, non-technical terrain, and fall scenery