February ultramarathons in United States (Southwest)

Trail loops in challenging winter conditions supporting air quality nonprofits and environmental education

Winter endurance loop on Grandeur Peak in the Wasatch Mountains, featuring challenging snowy conditions and views along the Wasatch Front.

Five-loop course around a tranquil lake, gently rolling pine-needle trails, non-technical surface with occasional roots, 100 mile and 100km distances

Scenic trails from Hacienda Entrance through Sierra Azul, summit finishes on Bald Mountain and Mt. Umunhum, diverse terrain and challenging climbs

Winter ultrarunning on multiple scenic loops through varied terrain, dramatic Pike's Peak vistas, and Colorado Front Range landscapes in Cheyenne Mountain State

Fast, scenic rail-trail ultra on a 15.5-mile out-and-back through Fort Richardson State Park, with paved trail and soft fine gravel footing.

50-mile loop around Skull Mesa via Trail 4, Chalk Canyon and Seven Springs, with Sonoran Desert singletrack, creekside stretches and rugged canyons

Arizona Trail ultra through the Madrean Sky Islands, with wide-open high desert views stretching toward Mexico.

Scenic 50-mile route at Fort Ord National Monument featuring single-track trails, rocky climbs, military history, and panoramic coastal views

Historic former Army landscape with coastal trails, preserved nature reserves, and sections of Fort Ord National Monument

Dirt and gravel roads, leaf-covered four-wheel drive paths, 4,500 feet of elevation gain, multiple water crossings, remote Cookson Hills landscape

Timed 6- or 12-hour format on a 5K lap loop, with hourly cutoffs and progressive elimination

Pacific Coast scenery and Marin Headlands landscapes, with views of Tiburon, San Francisco, and the Golden Gate Bridge

Rugged 50K in Angeles National Forest with 9,000+ feet of climbing and descending on mostly dirt trails through steep canyon terrain.

Rugged Twin Mountains loop featuring rocky climbs, creek crossings, steep powerline ascents, runnable jeep roads, and sections of historic stagecoach trail

12-hour overnight race on a one-mile loop, with rest and refuel zone at the start area and flexible pacing for runners of all levels

Challenging two-loop course through Daley Ranch with 6,300 feet of elevation gain and varied, scenic trails

Rolling trails through pine forests and along a lakeshore, technical sections with exposed roots, runnable terrain, and classic East Texas scenery

Rugged Sonoran Desert point-to-point on the scenic Black Canyon Trail, single track and stagecoach paths, challenging climbs in the second half

10-mile desert loop with steep climbs and descents, packed dirt and rocky terrain, elevations from 1903 to 2333 feet, expansive mountain and desert views