The Rubicon

Skybreaker Racing’s Mammoth Bar Trail Runs take place in the Mammoth Bar OHV Area within the Auburn State Recreation Area, near Auburn, California. The event offers three distances: Half Marathon, 10K, and 5K, designed for a high-vertical, rugged trail experience. Participants can expect steep climb..

Gold Rush Growler Trail Runs at Granite Beach, Folsom Lake SRA, offer a 10-mile trail run and a 5K along the shoreline and trails. For 2025, the courses are new: the 5K starts at Granite Beach, to Oak Point and Old County, then returns on new and old trails; the 10-mile route starts at South Granite..

Sunset & Cider Trail Races take place in Auburn, California, at Ponderosa Cider Co. The event offers 50K, 13.1-mile, and 5-mile trail distances. The 50K includes two out-and-back segments on the American River with runnable single-track and about 3,900 feet of climbing, aided by four stations.The 13..

The Auburn Half Marathon, held in Auburn, California, is a Brazen Racing trail event offering a half marathon, 12K, and 5K. Scheduled for October 4, 2025, the courses start at Overlook Park and run into the Auburn State Recreation Area, with more than half the route on the Western States Trail. Runn..

Yuba Gold Trail Runs takes place near Nevada City, California, in gold country. The event offers 50K, 35K, and Half Marathon distances along a historic route with views of the South Fork Yuba River and the Malakoff Diggins site. It’s an Independent P2P (DIY/self-guided) adventure rather than a tradi..

Mile Madness Endurance Run takes place at Sunset Whitney Recreation Area in Rocklin, California. The race uses a 1.05-mile loop (85% dirt, 15% paved) with about 62 feet of elevation per lap and a central Start/Finish hub. Runners choose from 6-, 12-, 24-, 48-, or 72-hour events, plus a 100-mile chal..