Rio Del Lago 100 Mile Endurance Run
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Rio Del Lago 100 Mile + 50K : event overview
The Rio Del Lago races take place on Saturday, November 1, 2025, at Beal's Point in the Folsom Lake State Recreation Area, in the Sierra Nevada foothills about 40 minutes east of Sacramento. Distances offered:
- 100 miles
- 50K
The 2025 100-mile is a qualifier for the 2026 Western States 100. Entry fees are non-refundable and non-transferable. Participants receive a technical race shirt and a finisher medallion; 100-mile finishers under 30 hours receive a finisher's jacket and belt buckle. Volunteer service of trail work or event support is strongly suggested for 100-mile entrants.
Course and race logistics
The 100-mile course has approximately +13,874 ft / -13,874 ft elevation change and follows trails and paved paths around Folsom Lake, along the American River Parkway, Nimbus Bluffs, the Johnny Cash Trail, No Hands Bridge, and sections of the Way Too Cool 50K course, reaching Auburn and returning to Beal's Point. Aid stations are cupless - runners must carry two water bottles or a hydration pack. Aid stations will stock GU gels, Skratch hydration, soft drinks, boiled potatoes, PB&J and JAMBARS, with hot veggie broth and hot food available at several designated stations. There are multiple no-crew-access locations on course; failure to comply may lead to disqualification. Three issued on-course drop bags (16" x 16") are provided for specified aid stations and must be claimed by noon on Sunday or they will be donated. Pacers are allowed only at specified aid station locations, must be on foot and at least 18 years old, and must sign a waiver. Four medical stations are staffed on course. Visit the organization's website for the most recent information.