Rio Del Lago 100 Mile + 50K Endurance Runs
The Jewel of the Sierra Nevada
November 7-8, 2026
Celebrating 25 Years of the Rio 100 Mile Endurance Run and 5 Years of the Rio 50K Endurance Run.
About the Races:
- Rio 100 Mile Endurance Run: A challenging course from Folsom to Auburn and back, featuring rolling singletrack and rugged Sierra foothills beauty.
- Rio 50K Endurance Run: Follows the scenic early miles of the 100-mile course along Folsom Lake, Lake Natoma, and the Johnny Cash Trail.
A Milestone Year — A Legendary Experience: Expect an unforgettable weekend filled with tradition, camaraderie, and celebration, with world-class race organization, well-stocked aid stations, and incredible volunteers.
All Entries Include:
- NorCalUltras Goody Swag Bag
- Commemorative 25th Anniversary Technical Race Shirt
- Finisher Medallion
- 100 Mile Finisher Belt Buckle (sub-30-hour finishers)
- 100 Mile Finisher Athleisure Lightweight Pullover
- GU Energy Gels on Course
- Skratch Hydration on Course
- B-Tag Chip Timing
- Bob and Brandt's Breakfast Bistro
- Chef Tim’s “Soup for the Soul”
- Dust Bowl Beer Garden
Visit the official website for detailed race information, course maps, and lodging options in Folsom, California.
