12hr Winter ultramarathons in United States

1.1-mile loop with 340 feet of climbing per lap, steep ascents, runnable sections, and a field descent on double track logging road

Certified 2.022-mile soft chat loop at former golf course, multiple timed races, strict cutoff rules, fully stocked aid, RV camping and tent space

Challenging 2.5-mile loop every 45 minutes, elimination format with no breaks, last runner standing wins, endurance-focused test

Multi-hour trail run and mountain bike loops through Camp Grier’s wooded trails, festive atmosphere, and community fundraising in Old Fort, NC

Certified paved loop on the shore of Lake Grapevine, with lake views, changing direction, and a spectator-friendly timed ultra format.

Beachside 6-hour ultra with ocean sunrise views, firm sand loops, small field, and dedicated volunteer support at each aid station

Winter Solstice laps on a fatass-style course, self-paced on trail terrain with on-site nutrition support

Repeated 5-mile loops around Lake Wailes on grass and asphalt, with a central village hub, frequent support, and a spectator-friendly format.

USATF-certified 1.0-mile loop around Cottonwood Lake with lake views, challenging endurance events including 24 Hour Solo and 100 Mile distances

Tranquil Wekiwa Springs trails, challenging ultra course, scenic views, local wildlife, solo or relay options, festival atmosphere with on-site aid

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

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

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.

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

Team-based trail course at The Silos Barn featuring fitness and strength tasks each lap, with one participant on the trail per team at a time

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