August ultramarathons in United States (East Coast)

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.

Figure-eight loops on rugged mountain trails, wildflower fields and dense forests, panoramic coastal views, community gathering at the Mountain Field

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

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

Wooded trails through Ward Pound Ridge Reservation, technical singletrack and carriage roads, 50K with 4,000 ft or 50-mile with 7,000 ft elevation gain

130-mile team relay through Adirondack landscapes from Gore Mountain to Saranac Brewery, passing Old Forge with an overnight camp

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

Team relay from Gore Mountain or Old Forge through the ADK Region to Saranac Brewery, featuring road and scenic segments with overnight camping option.

Certified dirt and cinder track loop at Clapp Park, eight-hour timed format with direction change at halfway, flexible pacing and on-course support

Flat out-and-back course on the Dahlgren Railroad Heritage Trail with dirt, gravel, and pine needle surfaces under continuous tree shade

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

10-mile singletrack loop through Noon Hill Reservation, diverse terrain and minimal road crossings, near Boston yet set in immersive woodlands

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

50k on Charlotte greenways: paved, flat, non-technical paths past parks, bridges and oak groves, with a playful taco-fueled atmosphere

Low-key, no-cost ultrarun with limited participants and community-supplied aid stations near the start and finish area

Eight hours on a scenic 5K trail loop at Daniel Stowe Conservancy, with a focus on personal achievement and camaraderie

Technical 2.5-mile loop on Pioneer Trail with hills, switchbacks, and Black Creek views in Florida heat and humidity, repeatable for up to 5 hours