Logo

Rio Del Lago 100 Mile Endurance Run

Granite Bay, United States • 1 Nov 2025

The Rio Del Lago 100 Mile Endurance Run is a premier ultramarathon held annually in the scenic Sierra Foothills of California, near Folsom Lake, about 40 minutes east of Sacramento. The challenging 100-mile course features approximately 13,874 feet of elevation gain and loss, traversing oak woodlands, meadows, single-track trails, and historic sites like Folsom Prison and No Hands Bridge. The route combines parts of the American River 50 and Way Too Cool 50K races, offering varied terrain suitable for both novice and veteran runners.

The event also includes a 50K race option. Aid stations provide extensive nutrition, and pacers are allowed on specific sections. The race fosters a supportive atmosphere with a post-race festival and is a qualifier for the Western States 100. Visit the organization's website for the most recent information.

United States California Granite Bay

Race information

Website
100 mi
13874 m+
100 Mile
31 mi
50k
Visit the organization's website for the most recent information.
Trail runs nearby

Mammoth Bar Trail Runs

Auburn - 10 mi from Granite Bay

The Mammoth Bar Trail Runs, hosted by Skybreaker Racing, is a new trail running event held in Auburn, California, within the Auburn State Recreation Area. Scheduled for September 7, 2025, the event offers three race distances: a half marathon, 10K, and 5K. The courses traverse the single-track and d..

Gold Rush 10M Trail Run

Granite Bay

The Gold Rush Growler Trail Runs take place at Granite Beach, Folsom Lake State Recreation Area in California, featuring scenic courses along the shoreline and single-track trails. The event offers two distances: a 10-mile trail run and a 5K, both with new courses for 2025. The 10-mile course includ..

Sunset & Cider Trail Races

Auburn - 10 mi from Granite Bay

The Sunset & Cider Trail Races, held in Auburn, California's scenic American River Canyon, offer three trail running distances: 50K, 13 miles, and 5 miles. The courses feature mostly runnable single-track trails with some short neighborhood road sections and varying elevation gains—3,875 ft for the..

Auburn Half Marathon

Auburn - 10 mi from Granite Bay

The Auburn Half Marathon, held in Auburn, California, is a trail running event featuring a half marathon, 12K, and 5K distances. Set in the scenic Endurance Capital of the World™, the race starts at Overlook Park and follows the renowned Western States Trail, crossing landmarks like No Hands Bridge..

Mile Madness Endurance Run

Rocklin - 4 mi from Granite Bay

...

The Mile Madness Endurance Run is a multi-day ultrarunning event held at Sunset Whitney Recreation Area in Rocklin, California. The course features a professionally measured 1.05-mile loop, mostly on dirt trails with some paved sections, offering smooth terrain and about 62 feet of elevation gain pe..

Granite Head

Granite Bay

The Granite Head will take place in Granite Bay on Saturday 11 October 2025. You can run between 6 and 11 miles.