October ultramarathons in United States (Mid-Atlantic)

Certified one-mile loop of pavement and crushed gravel at Sussex County Fairgrounds; flat, fast and highly runnable for 50K to 100 miles.

One-mile loop on grass and mulched paths, winding around ponds and open fields with light elevation gain and continuous on-course support.

104-mile out-and-back on Westmoreland Heritage and West Penn Trails, 7,392 feet of elevation gain, Morosini Reserve and parks in peak autumn colors

6.5-mile figure-eight loop through Prince William Forest Park, with singletrack, fire road, rolling terrain, and about 650 feet of climb per loop.

Multiple-loop 50K course through Coopers Rock woodlands, with 687 feet elevation gain per 10K segment and a sustained Category 4 climb

Rugged 10K singletrack loop in Coopers Rock State Park, 687 feet elevation gain per lap, wooded terrain, Category 4 climb, festive start/finish area

Looped 1-mile course through scenic Damascus parkland, festival atmosphere with live music, food trucks, and adjacent campsites

50K mountain course on Lake George’s scenic shores, five summit ascents, 9,000 feet of elevation change, rugged terrain, and limited exit points

Autumn timed ultra in New York’s Capital District, 6-hour solo format with distance-based buckles amid vibrant seasonal foliage

Challenging 100k along Pennsylvania's Black Forest Trail with over 13,400 ft of climbing, midnight start, rugged forests, and shifting toughest sections

Scenic 31-mile lake loop on mostly runnable trails, accessible terrain with moderate challenge, plentiful themed aid stations staffed by local runners

1-mile loops with 300 feet gain on technical, rocky trails at South Mountain Reservation; steep Lenape climbs, switchback descents, 3 or 6 hour format

Scenic 2-mile loop through Kakiat Park with 650 feet of vertical gain per lap and Hudson Valley fall foliage views

Rolling hills, creek crossings, and varied terrain through Glenroy Preserve’s historic landscape and Civil War-era landmarks

Multi-day mountain stage race around Spruce Knob, with 50k and 50-mile options, rugged Appalachian trails, big elevation, and remote high-country terrain.

Scenic rails-to-trails course along the New River with vibrant fall foliage, historic train trestles, gentle dirt and crushed gravel path, and minimal elevation

10.48-mile pine barrens trail loop in Rocky Point, with ultramarathon distances from 50K to 150 miles and flexible start times

Rolling hills and national scenic beauty on the Virginia Creeper Trail with easy crew and spectator access