California · 100 Mile Endurance Run · 50K Endurance Run
Rio Del Lago 100 Mile + 50K Endurance Runs
Rio Del Lago 100 Mile + 50K Endurance Runs is a 100 Mile Endurance Run and 50K Endurance Run event held in Granite Bay, California. Its next confirmed date is Saturday, November 7, 2026. About 297 runners take part across all distances.
- Race day
- November 7, 2026
- Location
- Granite Bay, CA
- Field size
- ~297 runners
Race details
- Date
- Saturday, November 7, 2026
- Location
- Granite Bay, California
- Distances
- 100 Mile Endurance Run, 50K Endurance Run
- Field size
- About 297 runners
- Course
- 100 Mile: ~13,874 ft gain / -13,874 ft loss (official); 50K: ~3,360 ft gain (third-party GPS estimate, same course)
- Registration
- ultrasignup.com
- Official website
- raceroster.com
Registration, course & weather
- Registration status
- Open
- Start time
- 5:00 AM PST
- Course profile — 100 Mile
- Out-and-back course; Mostly trail, some road; 13874 ft gain, 13874 ft loss (official course data)
- Course profile — 50K
- Out-and-back course; Mostly road, some trail; 3360 ft gain, 3360 ft loss (estimated from third-party elevation data)
About the Rio Del Lago 100 Mile + 50K Endurance Runs
Rio Del Lago 100 Mile + 50K Endurance Runs is a long-running Northern California ultra (2026 marks the 25th running of the 100-mile and 5th of the 50K) starting and finishing at Beal's Point on Folsom Lake, combining sections of the American River 50 and Way Too Cool 50K courses through oak woodland, the American River Canyon, and across the historic No Hands Bridge. The 100-mile course is a Western States 100 qualifier with roughly 13,800+ ft of climbing, a 30-hour cutoff, and a demanding technical second half run largely in the dark.
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Rio Del Lago 100 Mile + 50K Endurance Runs: common questions
- When is the Rio Del Lago 100 Mile + 50K Endurance Runs?
- The next confirmed date is Saturday, November 7, 2026.
- Where is the Rio Del Lago 100 Mile + 50K Endurance Runs held?
- In Granite Bay, California.
- What distances does the Rio Del Lago 100 Mile + 50K Endurance Runs offer?
- 100 Mile Endurance Run and 50K Endurance Run.
- How many people run the Rio Del Lago 100 Mile + 50K Endurance Runs?
- About 297 runners across all of its distances. That figure is an estimate of the field size, not an entry cap.
- How do I register for the Rio Del Lago 100 Mile + 50K Endurance Runs?
- Registration is handled by the organiser at ultrasignup.com. Entry fees, caps and deadlines are set there.
- Is registration open for the Rio Del Lago 100 Mile + 50K Endurance Runs?
- Yes — registration is open.
- What time does the Rio Del Lago 100 Mile + 50K Endurance Runs start?
- 5:00 AM PST.
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