100mi December ultramarathons in United States

100-mile course on a 7.2-mile loop amid long leaf pines and palmettos, gentle 225-foot elevation per loop, wildlife sightings, and illuminated night sections

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

Single track trails spanning cypress swamp bridges, hardwood forests and piney woods, with unexpected elevation changes for Louisiana

Trail race through rolling hills and hardwood forests, 12.7-mile loop with 2,300 feet of elevation gain per lap on a course normally closed to the public.

Rugged Hitchcock Nature Center course featuring steep hills, technical singletrack, challenging elevation, and scenic woodland views.

Rugged, relentless terrain across every trail, summiting both peaks with dramatic lake views on Crowders Mountain’s toughest ultra distances

Rugged mountain trails and steep ascents through the scenic Sylamore Ranger District, challenging terrain in the Ozark National Forest

Flat, point-to-point road course along Florida’s S.R. A1A, with Atlantic coastline views from Jacksonville Beach to the Ponce Inlet Lighthouse.

100-mile forest loops on mostly singletrack and narrow double-track, shaded canopy, gently rolling and runnable with few technical sections.

Rolling grass trails and natural scenery in Mosaic Peace River Park; 50K preview of future 100-mile course with $5000 purse and finisher medals

Multi-distance road ultramarathon on a 3.34-mile loop through Hawaii Kai, featuring out-and-back segments and hydration stations at Kalama Valley Park

Flat crushed gravel and paved walkway loop, with repeated laps shaping a steady, mentally demanding ultra format.

USATF-certified 1.0-mile loop around Cottonwood Lake with lake views, challenging endurance events including 24 Hour Solo and 100 Mile distances

Flat, fast 5-mile loop in Oak Mountain State Park; runnable trail format with frequent support access for 50K to 100-mile distances.

Self-supported road ultra across the Big Island, with limited resupply and a rugged, planning-heavy long-distance format.