12hr 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.

Shaded woodland loops on packed sand and pine needles, gentle elevation, single- and double-track trails with convenient pavilion start and finish

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

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

12-hour overnight race on a one-mile loop, with rest and refuel zone at the start area and flexible pacing for runners of all levels

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

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