Rio Del Lago 100 Mile + 50K Endurance Runs

Experience the Sierra Nevada's Jewel November 7-8, 2026, marks the return of the Rio Del Lago Endurance Runs presented by Altra for its 25th anniversary. This celebration extends to include both the Rio 100 Mile and Rio 50K races, each offering unique challenges and breathtaking scenery.
The Rio 100 Mile Endurance Run is a testament to endurance and determination. Participants will traverse from Folsom to Auburn and back, navigating through rolling singletrack trails adorned with river views and the rugged beauty of the Sierra foothills. This grueling yet rewarding journey promises an unforgettable adventure for runners seeking a true test of grit.
The Rio 50K Endurance Run enters its fifth year as a fan-favorite event. Starting alongside the 100-milers at Beal's Point, it follows scenic early miles along Folsom Lake and Lake Natoma before tackling the infamous Johnny Cash Trail. This distance is perfect for both first-time ultra runners looking to test their limits and seasoned competitors aiming for personal bests.
This milestone year will be filled with tradition, camaraderie, and celebration as we honor 25 years of Rio Del Lago's rich history. World-class race organization ensures a smooth experience from start to finish, while well-stocked aid stations provide essential support along the way. Warm-hearted volunteers add an extra layer of community spirit.
All participants will receive NorCalUltras goody bags and commemorative technical race shirts, with special finishes rewarding 100-mile runners who complete in under 30 hours with a unique finisher belt buckle and lightweight pullover. Enjoy GU Energy Gels on course and Skratch hydration to keep you fueled throughout the race.
The event weekend is packed full of memorable experiences, including Bob and Brandt's Breakfast Bistro where Chef Tim offers his "Soup for the Soul," and the Dust Bowl Beer Garden for a post-race celebration. Detailed information about the race can be found on the official website, along with course maps and lodging options in Folsom, California.
Join us as we celebrate 25 years of Rio Del Lago—25 years of endurance, community, and trail magic. We eagerly await your participation to make this special year one for the books!