January ultramarathons in United States (Mid-Atlantic)

Groomed forest trails on a three-lap loop, limited course marking with self-navigation, relaxed format with route flexibility

Looped course with flexible lap totals and early start option, welcoming atmosphere to begin the year with fellow runners

Scenic Willis River Trail loops with stream crossings, rolling hills, and a Bear Creek extension for the 50k option

Rugged winter 50k in Kanawha State Forest: sustained climb, rolling singletrack, two-loop course, and wooded West Virginia hills often under snow.

Gentle rolling terrain, short steep climbs, and scenic woodland singletrack, with brief road and open-field sections.

Winter trail loops in Chenango Valley State Park, festive atmosphere, support at start/finish, snowshoe and running options alongside the Pond Festival

Winter trail runs and snowshoe race on park trails with a shared start and finish area, held alongside festival activities and hockey games

Out-and-back 7.5-mile loops at Dryden Lake Park, 100-mile or 30-hour formats, basic aid, winter conditions, low-key community atmosphere

Challenging winter figure-eight course in the central Massanutten Mountains, featuring rocky terrain and two ascents of Waterfall Mountain

Self-supported endurance run on an unmarked course, following a no-fees, no-aid, no-awards philosophy in support of Annapolis Light House Shelter

Looped dirt trail course in Killen's Pond State Park with light roots and rubble, 80-foot elevation gain, scenic views, and minimalist support

Scenic valley course with mountain ridges, buffalo herds, rocky and grassy trails, panoramic views, forested descents, and fast road finish

Annual 50k honoring Theodore 'Ted' Corbitt and his legacy in American long-distance running

Six-loop 50k course on scenic wooded trails at Rockburn Branch Park, solo or relay, with flexible team and distance options.

Looped trail course through South Mountain Reservation, 3-hour and 6-hour timed options, starting and finishing at Turtleback Rock Picnic Area

Challenging trails and forest scenery on a course starting and finishing near Prince William Forest Park Campground