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Rio Del Lago 100 Mile Endurance Runs

~300 athletes

Auburn, California, United StatesNovember 7, 2026
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Ultra 100 Mile Race
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November 7, 2026 @ 05:00
Ultra 100 Mile
Start Time
05:00
Profile
hilly
Elevation
+13875 / -13875 ft
+4229m / -4229m
Net: +0 ft
Surface
trail

Why Runners Choose This Race

  • First Class Race management

  • Run through the beautiful Sierra Foothills of California

About this Race

Welcome

The Rio Lago 100 Mile Endurance Run Presented by Altra returns to celebrate our 24th year! This race brings together veterans and novices alike. Whether this is your 1st or 24th Rio 100, we are doing cartwheels to greet you in person on November 1st!

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