6hr ultramarathons in United States (South)

Scenic Kennesaw Mountain course passing historic sites, wooded trails, gravel, and asphalt, featuring sunrise and sunset views along an 8-mile out-and-back loop

Paved 1-mile loop with gentle elevation, direction changes, and a fully stocked aid station at the start/finish area

Looped nighttime miles on runnable single-track dirt trails through cedar and hardwood forests along the Duck River, glowing with reflective markers

Flat, open field trail designed for speed, minimal obstacles, challenging heat, personal fueling spots, and a communal post-race food spread

Six-hour endurance format at Greenbury Point, with Chesapeake Bay waterfront views and an exposed coastal setting.

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

Overnight looping relay and ultra at Kroger Field, with a paved course and a grassy, trail-like section for added variety.

Night trail loops on undulating 3.2-mile course at Cedar Ridge Preserve, featuring wooded terrain, varying elevation, and multi-hour endurance format

Rugged, heat-defined 24-hour and 48-hour ultra with smart pacing, cooler nighttime hours, and a laid-back, communal atmosphere

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

Daytime 12-hour, 6-hour, and 3-hour individual runs plus team relays, now part of the RUTS running series

12-hour looped course on county roads with asphalt and gravel, mostly flat terrain, partial shade, and open traffic

One-mile paved loop on scenic university campus, spacious accessible lanes, grassy tent areas, abundant aid stations, and gymnasium facilities

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

Paved 3-mile out-and-back loop through Walsingham Park, self-supported format, hot and humid Florida conditions, ample space for personal setup

Technical sections on High Rocks Spur and Boundary Trail loop, featuring challenging and varied terrain through Crystal Springs Recreation Area

Nighttime trail race on a 10km loop in Dinosaur Valley State Park, 670 feet of elevation gain, timed 4, 6, or 8-hour options, featuring the Claw Challenge

Rugged Tennessee hills, relentless dirt loops, 90+ degree heat, Barkley-inspired quirks, and aid station party zones supporting animal rescue

Loop trails at Fort Loudoun State Historic Park, with smooth runnable footing and scenic views of Tellico Lake and rolling hills.