September ultramarathons in United States (Southwest)

Flat 2-mile loops on the Bonneville Salt Flats from sunset to sunrise, overnight relay or solo effort under starlit skies

30-leg road relay route from Idaho Springs to Buena Vista, traversing Guanella, Georgia, and Fremont passes with varied terrains and mountain views

Historic mining district course with ascents to Miners Creek, scenic trail descents, landmark passages, and strict pace cutoff times

Mountain vistas, dirt trails, and rugged climbs at China Peak Mountain Resort; options for 25km, 50km, and 100km distances

Mountain trails through east San Diego County, runnable single-track, National Forest scenery, challenging terrain, 9.5-hour cutoff

Single track trails, ranch roads, field crossings, and water crossings on a 2800-acre working cattle ranch in the Texas Hill Country

Technical Camp Eagle trails, rugged terrain, scenic 1400-acre venue, multi-day trail sports festival with running, rucking, and mountain biking options

Point-to-point ultramarathon across Colorado’s rugged Elk Mountains, tracing historic backcountry trails with high-elevation alpine vistas and technical terrain

Private ranch route with extremely steep hills, significant elevation changes, and closely spaced aid stations for early September heat

Scenic 50K trail course with multiple aid stations, well-maintained paths, and festive post-race refreshments

Trail running weekend at Camp Buckner in the Texas Hill Country, with purpose-built routes, rolling countryside, and a family-friendly camp atmosphere

Mount Diablo course featuring panoramic vistas of the San Francisco Bay Area and surrounding valleys, emphasizing the region’s natural scenery

Trail route through Mendocino Woodlands State Park with forest scenery, tent cabin options, and meals included on Saturday

Scenic, flat 1.05-mile loop with ultra-distance options and generous time limits, designed for fast times and all experience levels

Mountain course from East Mountain Wilderness Park to Soldier Hollow, approximately 24,000 feet of ascent through the Wasatch Mountains

Overnight team relay across 165 miles from Idaho Springs to Buena Vista, traversing Guanella, Georgia and Fremont Passes on scenic single track trails.

Scenic trails through Tilden Regional Park and Wildcat Canyon, shaded oak and eucalyptus groves, open stretches with bay and bridge views, beginner-friendly