6hr February ultramarathons in United States

Challenging winter loops on Grandeur Peak with 2,600 feet of elevation gain per 5.8-mile circuit in the Wasatch Mountains

Trail loops in challenging winter conditions supporting air quality nonprofits and environmental education

Winter endurance loop on Grandeur Peak in the Wasatch Mountains, featuring challenging snowy conditions and views along the Wasatch Front.

Winter ultrarunning on multiple scenic loops through varied terrain, dramatic Pike's Peak vistas, and Colorado Front Range landscapes in Cheyenne Mountain State

Rugged 4.2-mile dirt loop on single track with 397 feet elevation gain per lap, rocky and rooted terrain at Greensfelder Park, options of 9, 6, or 3 hours

Looped course on a 2-mile smooth, gently rolling single track trail with central aid station support

Timed 6- or 12-hour format on a 5K lap loop, with hourly cutoffs and progressive elimination

Challenging 3-mile loop at Wyandotte County Lake Park with both easy stretches and demanding hills, repeated over 3 or 6 hours.

Multi-day ultra event at Clay County Regional Sports Complex with ample self-crewing space, flat venue terrain, and festive community atmosphere

Certified 1.2-mile loop with gentle elevation, 95% hard surface, scenic lake and bridge crossings, and generous time limits in Henderson, Nevada

Flat, non-technical 2-mile loop through open pasture and shaded woods on a 350-acre private family farm in Brooklet, Georgia.

Multiple Drinking Horse Mountain ascents on foot, supporting the Wildland Firefighter Foundation

Paved .78-mile loop near Milner Recreation Complex with 43 feet elevation gain per lap, passing parks, sports fields, and fitness facilities.

Winter mountain loops on Malans Peak, Ogden City with snow and icy conditions; individual or team endurance formats supporting air quality causes

Winter timed ultra with solo or relay options, 12- or 20-hour formats, continuous distance challenge

12-hour winter trail event on 3-mile loops at Camp GuilRock, featuring grassy trails, gravel roads, singletrack, gentle rolling terrain, and day-to-night laps

Rolling 2-mile loops through Will Rogers State Park with solo and relay options, 12 or 24 hour format, scenic views and frequent aid station support.

Rolling 2-mile loops through Will Rogers State Park, gentle terrain, multiple laps, fully stocked aid station, solo and relay formats, 24- and 12-hour options