12hr ultramarathons in United States (East Coast)

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

Scenic 1.9-mile loop at Notchview with a 0.2-mile climb, rolling single and double track, open fields, and cross-country ski trails

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

1.776-mile loop through historic Putnam Memorial State Park, featuring multiple timed race options in a landscape tied to Revolutionary War history

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

1.07-mile loop course with cross-country terrain, paved and unpaved sections, rolling hills, and natural obstacles like divots and tire tracks

Timed ultramarathon featuring 12-hour and 24-hour options on a one-mile loop with full aid station support and space for personal setups

Randomly assigned trail loops across South Mountain Reservation, strategic decisions at dusk, and unpredictable routes inspired by the TommyKnocker Ultra

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

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

Flat 3.75-mile paved loop at Cooper River Park with Philadelphia skyline and waterfront views, easy pit access, and some rubber track sections.

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

Flat .8-mile park loop with pavement or gravel options, timed format, personal gear area near start/finish, accessible terrain in Westfield, NJ

Rugged southern trails with radical elevation changes, tough terrain, creek crossings, swamps, rocks, and roots at Newbsanity Adventure Center

Scenic Colt State Park loops with pavement, rooty trails, and grass; mostly flat terrain, waterfront views, frequent aid stations, summer heat challenge

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

Gentle dirt loop through tranquil woods and along the historic Murderkill River, featuring sandy paths, single-track sections, and a footbridge crossing

Flat, 1.5-mile unpaved loop through tree-lined trails and lakeside scenery at Oak Grove Lake Park, featuring wildlife and a single aid station

3.7-mile loop on Warhill Nature Trail with crushed gravel, rolling hills, evening-to-morning hours, night running, and mandatory volunteer hour