6hr ultramarathons in United States (Midwest)

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

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

Shaded crushed gravel loop along the Big Piney River, 6-mile circuit with a notable hill, festive summer setting near Old Route 66

Shaded woodlands loop on mixed surfaces in Route 66 State Park; flat, fast course with summer heat, night running, and main aid station support

Challenging dirt trails and singletrack loops through Franke Park, four or eight hour solo or team formats, event village amenities

Paved 4-mile loop at Mill Creek Park, scenic starts and finishes by J.C. Nichols Memorial Fountain, well-stocked aid station each lap

Timed 3- or 6-hour run on a 1-mile loop around Watershed Nature Center, evening hours requiring a light source, limited to 140 participants

Historic Blackhawk Ski Club loop with 367 feet of gain per 2.25-mile lap, 50-foot pines, spring pool, rope swing, and climb beneath the ski jump

Challenging 12-hour last runner standing on a 4.1-mile rugged trail loop amid summer heat at Comlara parks, testing endurance, pacing, and strategy

3.2-mile mostly flat loop around Nocterra Brewing with modest elevation and a 6-hour ultra format, featuring festive atmosphere and lively distractions

Demanding 1.1-mile loop with 140 feet of elevation gain per lap, steep climbs on Hogsback Lane, a mix of paved and singletrack in Rocky River Reservation

Repeated 1.5-mile farm loop on flat dirt and pasture, surrounded by miniature animals, with variable trail conditions and on-site camping options.

One-mile loop on a wide, gently rolling path of gravel, grass, and dirt with 72 feet of elevation gain per loop, illuminated for nighttime laps.

Nighttime six-hour race on a 4.1-mile loop featuring paved, gravel, and single-track dirt trail, with all laps starting and ending at the HUB

Scenic 1-mile paved loop in a 58-acre city park, rotating hourly challenges, 6- or 12-hour format, solo or relay options, central aid station and vendor

Customizable 6 or 24-hour looped run or walk with flexible distance goals

Looped course through Fargo and Moorhead parklands, varied terrain, multiple bridge crossings, and extensive aid between laps

Certified 1.05-mile loop with flat, gentle terrain and minimal elevation at Miller Ecological Park; choice of 100-mile or 24-hour ultrarunning format