Trail ultramarathons in California, United States

Rocky out-and-back course through Bear Valley and Lake Spaulding, steep ascents on Signal Peak loop, challenging terrain with rugged segments

Technical singletrack and rolling fire roads through shaded oak groves and exposed hillsides, with sweeping Bay Area views and a challenging elevation profile

Trail route through towering coastal redwoods, stream canyons, meadows, pine and oak forests, ridges, and San Lorenzo river crossings

Steep ascents and dramatic descents along the Harding Truck Trail in the Santa Ana Mountains, featuring expansive vistas and a 50K distance.

Looped 50K course through Tahoe National Forest, mixing singletrack and fire roads, rocky summit climbs, 6000–8000 ft elevation, 3000 ft gain

Looped 1.3-mile course featuring trail, grass, and bike path segments in Montgomery Waller Community Park, near Imperial Beach and Chula Vista

Scenic loop route on dirt fire trails with modest elevation gain and classic trail ambiance

Northern Sierra Nevada trails with steep elevation gains, raw terrain, and views of mountain lakes, granite ridges, and dense forests

Relatively flat out-and-back rail trail from McCloud with views of Mt. Shasta and excellent footing in a mountain setting

Nighttime 50k on historic Cahuilla tribal lands, 7-loop course with single track and dirt road terrain, headlamp required, festive atmosphere

Remote San Gabriel backcountry route through preserved wilderness, featuring picnic spots, campgrounds, and a demanding 100-mile ultrarunning course

Demanding climbs and descents through Marin Headlands, starting near Fort Cronkhite and Rodeo Beach, with Pacific and Golden Gate Bridge views

Morning trail run on single and double track paths at Thomas F. Riley Wilderness Park, surrounded by Orange County scenery

Loop course from Lake Chabot Marina through East Bay Regional Parks, reaching Skyline Gate, supportive atmosphere, plant-based post-race options

100-mile loop around Folsom Lake from Granite Bay Main Beach, passing Loomis, Auburn, and El Dorado Hills with lake and river canyon views

Alpine loop course through the High Sierra with 7,700 feet of elevation gain, high-altitude trails, and Lake Tahoe Basin views

Time-based ultrarun in Napa's Skyline Wilderness Park, 4.16-mile trail loop with 815 feet of gain per lap through rolling hills and historic landscapes

Single track and fire roads through the Santa Monica Mountains, ocean vistas, steep climbs, and exposed canyons with potential triple-digit heat

Hilly Almaden Quicksilver Park course with a mix of 60% dirt roads and 40% single track trails, featuring sweeping countryside views