12hr ultramarathons in United States

Nighttime endurance laps on an illuminated dirt horse track at Harrison County Fairgrounds with continuous chip timing and flexible distance

Scenic Kennesaw Mountain course passing historic sites, wooded trails, gravel, and asphalt, featuring sunrise and sunset views along an 8-mile out-and-back loop

Scenic 1.9-mile loop at Notchview with a 0.2-mile climb, rolling single and double track, open fields, and cross-country ski trails

Paved 1-mile loop with gentle elevation, direction changes, and a fully stocked aid station at the start/finish area

Looped nighttime miles on runnable single-track dirt trails through cedar and hardwood forests along the Duck River, glowing with reflective markers

Rolling grassy hills on a compact cross country loop with team relay format, dusk headlamps required, and awards for most laps completed

Rugged mountain trails in the Laramie Range with a 2,800-foot climb to Laramie Peak’s 10,200-foot summit and alpine views

1.776-mile loop through historic Putnam Memorial State Park, featuring multiple timed race options in a landscape tied to Revolutionary War history

Half-mile pine forest loop in Lowell Park, continuous 6, 12, or 24-hour format with self-supported setup and solo or team options

Crushed limestone loops circling Miola Lake with well-stocked aid stations in a low-key, supportive ultramarathon setting

Flat, open field trail designed for speed, minimal obstacles, challenging heat, personal fueling spots, and a communal post-race food spread

Flat 1.25-mile paved loop on a former military base with asphalt, concrete, a brief gravel section, and shady pine trees

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

Overnight looping relay and ultra at Kroger Field, with a paved course and a grassy, trail-like section for added variety.

1.07-mile loop course with cross-country terrain, paved and unpaved sections, rolling hills, and natural obstacles like divots and tire tracks

Timed ultramarathon featuring 12-hour and 24-hour options on a one-mile loop with full aid station support and space for personal setups

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

Randomly assigned trail loops across South Mountain Reservation, strategic decisions at dusk, and unpredictable routes inspired by the TommyKnocker Ultra