December ultramarathons in United States (Gulf Coast)

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

Flat, sea-level loops with minimal elevation gain and a lively event village atmosphere

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

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

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

Two-mile looped trail along the Chattahoochee River with self-serve aid stations and a community-focused, no-frills atmosphere

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

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

Flat, fast, multi-loop trail on hard crushed rock and soft paths amidst Brazos Bend State Park wildlife, with frequent aid stations and ideal December weather

Hourly looped course elimination format, continuing until only one runner remains

Last-man-standing format on a challenging 4.5-mile trail loop near the Texas-Oklahoma border, designed for higher difficulty and originality

Certified paved loop on the shore of Lake Grapevine, with lake views, changing direction, and a spectator-friendly timed ultra format.

Beachside 6-hour ultra with ocean sunrise views, firm sand loops, small field, and dedicated volunteer support at each aid station

7.75-mile loop with hard-packed trails, challenging technical sections with oak tree roots, and 90% shaded canopy coverage

River Trail loop winding through lush swamp and forest, with wildlife encounters and potential challenges along a 3-mile riverside course

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

Fast, approachable multi-lap course with singletrack, doubletrack, and dirt road; spectator-friendly loops and a clear path to 50K.

Flat and fast 10k loop course through Wakulla Springs State Park, featuring scenic freshwater springs and historic film backdrops

Flat, USATF-certified 10k road loop in Wakulla Springs State Park with ample volunteer support and scenic surroundings

Looped 50K and 100K courses through North Texas foothills, featuring diverse trail terrain, elevation changes, and rugged natural surfaces at Lake Ray Roberts.