January ultramarathons in United States (Southwest)

Smooth, climate-controlled indoor track at the Olympic Oval; five-hour timed event on a repetitive loop circuit

Lakefront trails through Arkansas Bend Park, skirting the Colorado River and limestone bluffs, with natural terrain and unique endurance formats.

Dynamic loops at Shaffer Bend Park along limestone bluffs and the Colorado River, sun-bleached trails, lush scenery, and manageable elevation per loop

Looped trail course over sun-bleached limestone bluffs, riverside paths, and Colorado River views, with moderate elevation changes and stargazing opportunities

Rugged Lost Coast landscapes, remote backcountry gravel and pavement, starting from Horse Creek Mountain trailhead near Shelter Cove

Scenic trail routes through Hacienda Hills with Bay Area views and challenging elevation at Almaden Quicksilver County Park

Rugged, root-laden single-track trails through Cameron Park’s valleys and hills, 450 feet of elevation gain per 8K loop, cool winter temperatures

Flat, open route on the Northeast Texas Trail with gravel, dirt, pavement, and grass sections through small towns and rugged backcountry

Out-and-back ultra across Catalina Island with rugged terrain, Pacific Ocean views, and possible bison sightings from start and finish in Avalon.

Rugged Texas Hill Country trails, rocky paths, thorny foliage, and technical terrain amid striking natural scenery

Scenic, mostly fast trails with rolling singletrack, local landscapes, and a signature climb to Raptor Ridge on a 50-mile course suitable for all levels.

Rolling singletrack through saguaro-studded Sonoran desert, with the steep, rocky Goldmine climb and wide-open views in San Tan Mountain Regional Park.

Western States trail route featuring No Hands Bridge, K2 training hill, single-track along American River, Robie Trail, Dead Truck, Goat Hill, and Overlook Hill

El Dorado Trail route with stretches of pavement and rugged, unpredictable terrain; five minimal aid stations; self-supported format

Rugged technical trails through rocky paths and steep climbs in Texas Hill Country, featuring the challenging Bandera 100k and non-competitive 50k courses

Desert singletrack and foothill paths in Estrella Mountain Regional Park, with Sonoran scenery and 100K or 100-mile options.

Loopy dirt and rocky singletrack in Bastrop State Park, with pine forest scenery, steady hills, and rolling Central Texas terrain.

Rugged, technical 50K route through the unexpectedly mountainous terrain of the Ouachita Mountains with significant elevation changes

Ten 5ks within 24 hours on paved trail loops at Henderson’s Cornerstone Park, featuring frequent starts, green space for camping, and self-supported hydration

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