50K December ultramarathons in North America

Technical multi-lap course through Oak Mountain State Park, starting and finishing by Tranquility Lake

Scenic Lake Ray Roberts routes with well-groomed single-track and technical segments featuring roots, rocks, and varied North Texas terrain

Classic Northern California terrain: flowing singletrack, rolling dirt paths, stout climbs, heat, exposure, and wide-open vistas.

Technical 10.5-mile loop with rolling hills and diverse terrain through Caloosahatchee Regional Park’s scenic Green, Black, and Blue trails

Scenic desert landscapes, rolling singletrack, quick ascents and descents on a mix of classic and newer trails in McDowell Mountain Regional Park

Coastal trails through Point Mugu State Park, panoramic ocean views, rugged climbs, and rejuvenated landscapes with blooming flora

Loop through rolling Spangler Hills desert terrain on jeep roads, singletrack and sandy washes, with expansive views of the Southern Sierra.

Flat rail trail with gentle inclines, sub-1500 feet elevation gain, downtown Farmville start, High Bridge crossings, generous 100k cutoff

Rugged winter ultramarathon with 136 feet elevation gain per mile, persistent climbs and descents at Twin Valley's chilly, scenic terrain

Smooth, rolling singletrack on a no-repeat 50K with wooded loops, changing scenery, and around 1,600 feet of elevation gain.

Mostly trail route with 4,000 ft elevation gain, rocky technical sections, waterfall views, and a final steep canyon ascent in distinctive Georgia scenery.

Looped single-track trails with roots, rocks, rolling hills, short technical stretches, and fire road sections through northern Virginia

Rugged Springfield trails, year-end atmosphere, festive gatherings, special recognition for back-to-back efforts

Classic hill country single track, rocky sections, open fields, creek beds, cacti, bluffs, and ravines along the San Gabriel River near Austin

High-altitude 50k on technical trails through Staunton State Park, featuring rugged mountain terrain, granite cliffs, meadows, and frequent wintry conditions.

Picturesque course along Des Plaines River and Casey Trails with pavement, wooded paths, crushed limestone, and rolling hills; potential winter conditions

Three rugged 10.4-mile loops with over 4,000 feet of elevation gain on rolling, technical trails through Salt Fork State Park

Scenic 10k desert loop near St. George with alternating directions, varied distances, and supportive trail running atmosphere

Millerton Lake and San Joaquin River trails with scenic valley views, 50k route, regular aid stations, and crew access at River Gorge Management Area

Technical singletrack and rugged trails through Jackson-Washington State Forest, with scenic southern Indiana views and a community hub at Pyoca Camp