50mi Winter ultramarathons in United States

Technical multi-lap course through Oak Mountain State Park, starting and finishing by Tranquility Lake

Scenic desert landscapes, rolling singletrack, quick ascents and descents on a mix of classic and newer trails in McDowell Mountain Regional Park

100-mile course on a 7.2-mile loop amid long leaf pines and palmettos, gentle 225-foot elevation per loop, wildlife sightings, and illuminated night sections

Mostly trail route with 4,000 ft elevation gain, rocky technical sections, waterfall views, and a final steep canyon ascent in distinctive Georgia scenery.

High desert ultramarathon on the Arizona Trail with out-and-back segments, expansive views, and northern ridgeline passages near the Santa Rita Mountains

Trail race through rolling hills and hardwood forests, 12.7-mile loop with 2,300 feet of elevation gain per lap on a course normally closed to the public.

Point-to-point 50-mile course from Sunrise Trailhead through Cuyamaca Rancho State Park, forested trails, and Oriflamme Canyon to the desert floor finish.

Rugged Hitchcock Nature Center course featuring steep hills, technical singletrack, challenging elevation, and scenic woodland views.

50K and 50-mile road ultra on repeated 3.33-mile Prospect Park loops, with a spectator-friendly format and frequent aid access

Rugged, relentless terrain across every trail, summiting both peaks with dramatic lake views on Crowders Mountain’s toughest ultra distances

Flat and fast 10k loop course through Wakulla Springs State Park, featuring scenic freshwater springs and historic film backdrops

Flat, USATF-certified 10k road loop in Wakulla Springs State Park with ample volunteer support and scenic surroundings

2.45-mile loop with mixed trail and path, moderate elevation gain, minimal aid, variable New England weather, and classic low-frills ultrarunning format

Coastal route from Big Lagoon State Park to Fort Morgan, with soft sand, pavement, rolling bridges, exposed causeways, and emerald-water views.

Winding winter trails through Lakewood Nature Preserve prairie, moonlit overnight course starting and finishing at a rustic barn with fire pits and warm aid

Mostly singletrack mountain trails with tough climbs, runnable stretches, bluff-line vistas, creek crossings, and a Lula Falls section.

Rolling hills, mixed trail and gravel with mostly asphalt, northwestern Wisconsin scenery, potential winter conditions in December

Multi-distance road ultramarathon on a 3.34-mile loop through Hawaii Kai, featuring out-and-back segments and hydration stations at Kalama Valley Park

Scenic point-to-point route from the West Ashley Greenway through historic Charleston, crossing bridges and coastal landscapes, self-supported and unmarked

Flat crushed gravel and paved walkway loop, with repeated laps shaping a steady, mentally demanding ultra format.