Spring ultramarathons in California, United States

Scenic 50K course on picturesque trails with frequent aid stations, extensive runner support, and post-race refreshments including soup and frog cupcakes

Lush forests, oak woodlands, and open grasslands in the Santa Cruz Mountains, scenic ridges and climbs, soft and firm trails, variable weather conditions

Rugged out-and-back course on the Western States Trail, featuring Sierra Nevada foothills scenery and historic Foresthill routes

Steep, rocky 35-mile loop with over 10,000 feet of elevation, technical climbs like Edison Catwalk, and scenic Santa Barbara front country trails.

Scenic, historic desert trails in Anza-Borrego Desert State Park, with open terrain, a rugged Southwestern backdrop, and a relaxed basecamp feel.

11,000 feet of elevation gain through Marin Headlands, Mt. Tamalpais, and Muir Woods on a 50-mile route with coastal vistas, redwoods, and technical trails

Steep, rocky, and remote 35-mile route with over ten thousand feet of elevation change; Santa Barbara front country trails with extended unsupported sections

Single-track trails along Folsom Lake with rolling hills, oak trees, technical sections, and views of foothills and the Sierra Mountains.

Mountain venue along Lake Cuyamaca at 4,613 feet elevation, surrounded by scenic views just south of historic Julian

Scenic, demanding mountain routes on Marin County trails, including a tough 50K loop and 100K point-to-point with sweeping Bay Area views.

Challenging 50K trail with diverse terrain, elevation changes, and historical scenery tied to the legend of Rattlesnake Dick

Classic Northern California singletrack, rolling dirt paths, stout climbs and panoramic views in oak-dotted hills; exposed, heat-prone 50K.

Challenging 50K course with steep hills, varied terrain, and panoramic views across peaks, ridgelines, canyons, and valleys in Santa Clarita

Redwood groves, scenic ridgelines, and shaded forest sections along East Ridge, West Ridge, Stream, and Bridle trails

One-mile loop course in a 20-acre desert near downtown Joshua Tree, featuring solo stretches, festival ambiance, and personal rest space for participants

Dry Creek Parkway backyard ultra in Rio Linda: repeating 4.17-mile hourly loops, last-runner-standing format, and mounting elimination pressure.

Scenic Santa Ynez Valley course winding through peaceful backroads, local landmarks, and wine country hills between the Pacific Ocean and vineyards