12hr ultramarathons in United States (Gulf Coast)

Flat 1.25-mile paved loop on a former military base with asphalt, concrete, a brief gravel section, and shady pine trees

Sugar sand dunes of coastal southeast Florida, mini-game style challenges, 24-hour and half marathon options, peak summer heat, varied difficulty levels

Flat, shaded one-mile loops on palm- and oak-lined trails between river and ocean, nontechnical terrain showcasing old Florida hammock.

Winding gravel trails through oak and palm groves along the Loxahatchee River, wildlife sightings, sections of the Lake to Ocean Trail, natural Florida scenery.

Looped 2.75-mile course on Sandridge Trail in Jennings State Forest, with 3, 6, or 12 hour options and convenient access to aid and parking

12-hour loop around Lake Hollingsworth on paved walkways, 2.84-mile laps, solo or relay, lakeside views, hot food, and a capped field

Night trail loops under the brightest full moon, marked courses of 3.3 or 4.17 miles, 8-hour lap challenge and 12-hour Last Runner Standing format

Hilly jeep road loops on 1North Adventure Trails, hourly 3.5-mile circuits, night running emphasis, flexible pacing, festive atmosphere, pancake breakfast

Flat 5K out-and-back loops on the tree-lined Cecil Field Recreational Trail, with Tent City access and a fixed-hourly-start 50K format

Flat 2-mile loops on Trinity River trails, mostly pavement with optional grass, centered on close-up crowd energy at Martin House Brewery.

Scenic Arkansas Bend Park routes overlooking Lake Travis, single-track and wide trails, moderate elevation changes, autumn foliage, night running sections

Smooth, paved one-mile loop in Veteran's Park with multiple timed event options and electronic chip timing for solo runners or relay teams

Paved 2-mile loop through Ravine Gardens State Park, with winding curves, a few hills, shaded oaks, and old Florida scenery.

USATF-certified track ultramarathon with 6, 12, 24, and 48-hour timed race options on a newly renovated surface at Florida Atlantic University

Challenging 5-mile loop on private Carthage trails, mixing pine straw paths and technical terrain with 800+ feet of elevation gain per lap

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

Repeated 5-mile loops around Lake Wailes on grass and asphalt, with a central village hub, frequent support, and a spectator-friendly format.

Tranquil Wekiwa Springs trails, challenging ultra course, scenic views, local wildlife, solo or relay options, festival atmosphere with on-site aid

Out-and-back on Lake Bastrop’s North-South Trailway: packed dirt singletrack, sand and rock through Lost Pines, bridges and gently rolling terrain.