August ultramarathons in California, United States

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

Single-loop 50k on iconic Marin trails with 6,500 ft of elevation gain, steep climbs, technical segments, and sweeping Bay Area and Pacific Ocean views.

Course through East Ridge, West Ridge, Stream, and Bridle trails in Redwood Regional Park, surrounded by towering redwoods

Lush horse trails around Jenkinson Lake, winding through dense pine forests in Sly Park with seasonal changes in El Dorado National Forest scenery.

Scenic 2-mile loop at Harvey Bear Ranch with hill and mountain views, multiple distance options, generous cutoff times, and a community-focused environment.

Looped 5-mile course at 6,000 feet with lake views, 10-hour race format, Western States Raffle qualification after 8 laps, cash prizes for top finishers

Trails winding through redwoods and ferns, with routes across King's Mountain and Bear Gulch in Huddart Park