6hr January ultramarathons in United States

Scenic loop course at Holland Park with 6- and 12-hour endurance options, lap tracking with rocks, passing local hotspots

Looped course with aid station every 1.24 miles and option for personal supplies at the trail's edge

Cross country trails winding through Caldwell Woods and Bunker Hill, 5 km loops on grassy or paved terrain, ultra and team options, winter forest setting

Rugged forested loops on Whitwell Mountain with 1000 feet of elevation gain per circuit, diverse terrain, bluffs, waterfalls, and scenic vistas

6.2-mile private trail loop with 1,350 feet of climbing per lap, 95% singletrack, creek crossings, hardwood forests, pine groves, and varied terrain

Looped 1.3 and 3.1 mile courses with flexible distance options in a 12-hour endurance format

Out-and-back on Lake Bastrop’s North-South Trailway: packed dirt singletrack, sand and rock through Lost Pines, bridges and gently rolling terrain.

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

Randomized trail loops through Clinton Lake State Park’s varied terrain, originating from Coneflower Campground, with 24-hour and shorter duration options

4.15-mile loop of moderately technical singletrack through hardwood forest, with rocks, roots and about 400 feet of elevation gain per lap

24- and 48-hour record-eligible track ultras on a newly resurfaced Florida Atlantic University loop, with infield crew setup and four-hour direction changes

Repeated laps of the Great Blue Heron Loop Trail over 3, 6, or 12 hours, with individual and 12-hour relay team options

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