January ultramarathons in United States (West)

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

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

Winter backyard ultra in Idaho Falls: repeating grass, dirt, and pavement loop, variable snow, and a last-person-standing format.

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

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

Scenic Oregon coast 50K with coastal trails and post-race potluck at Yachats Commons

Point-to-point 31.1-mile route from Coconut Island to nearly 4,000 feet at Volcano, primarily along Highway 11 with a sea-level to high elevation climb

Loop course on uneven, muddy winter trails at Bridle Trails State Park, shifting from daylight to night

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

Four 7.75-mile loops around Pullman on a scenic winter course through the Inland Northwest

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

Rugged mountain trails above Honolulu with steep climbs, technical terrain, tropical forest, and panoramic Pacific Ocean views

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

Mountain ascent on a cold, wet, and rugged course through scenic terrain; endurance-focused route reflecting Olytrailrunners tradition

Lush trails through Huddart Park, King's Mountain, and Bear Gulch surrounded by towering redwoods and dense ferns

Scenic double out-and-back on Kirkland Corridor Trail with frequent runner sightings and easy aid station access