Folsom to Auburn and Back!
November 1-2 2025
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!
Back again by popular demand, now in its 4th year, is our Rio 50K Endurance Run Presented by Altra! The 50K begins at Beal's Point with the 100 milers and traverses the first part of the Rio course. This course and distance are perfect for your first or fastest 50K! You'll be surrounded by the majestic views of Folsom along Lake Natoma and the infamous Johnny Cash Trail!
You can expect first class race management from start to finish. Well stocked aid stations, along with drop bag locations are on course. Our enthusiastic volunteers will provide inspiration and motivation on your journey from Folsom to Auburn and back.
Entry for the 50K and 100-miler includes
NorCalUltras Goody Swag Bag
Technical Race Shirt
Skratch Coupon
Finisher Medallion
100 Mile Finisher Belt Buckle (for those finishing sub-30 hours)
100 Mile Finisher Athleisure Lightweight Pull Over
GU Energy Gels on Course
Skratch Hydration on Course
B-tag timing
Bob's Breakfast Bistro
Chef Tim's Soup for the Soul
Fruit and assorted beverages
Please visit web site for detailed race information along with lodging opportunities in our host City of Folsom.
We look forward to your participation!
The NorCalUltras Team
Registration fees
Prices are inclusive of mandatory charges, items, and fees
100 Mile Endurance Run Spots remaining: 447
Price changes in 3 months 22 days-
-
Register for 100 Mile Endurance Run$403.20
Early Bird Pricing
Now registering Dec 19 – Apr 14 -
$456.70
Standard Pricing
Apr 15 – Aug 31 -
$483.45
Late registration
Sep 1 – Oct 27
-
50K Endurance Run Spots remaining: 199
Price changes in 3 months 22 days-
-
Register for 50K Endurance Run$151.78
Early Bird Pricing
Now registering Dec 19 – Apr 14 -
$173.17
Standard Pricing
Apr 15 – Aug 31 -
$199.92
Late Registration
Sep 1 – Oct 27
-
Cancellation Policy
Per the running industry policy, all entry fees are non-refundable & entries are non-transferable. Once we receive and accept your entry, you will not receive a refund if you cannot participate, you may not give or sell your number to anyone else, and you may not transfer your 2024 entry fee to a future race. This policy applies to all entrants and is in effect whether you are injured, have an unexpected family/business emergency, have a medical emergency, etc. If the course has to be changed or the race is cancelled due to an act of nature there are no refunds or rollovers. There are NO exceptions.
It is highly suggested that you purchase the Protection Policy.
Check out our other events!
Contact information
- Event contact
- Fit 2 Run, Inc.
- julie@norcalultras.com
- Phone
- 9167656021
- Website
- Visit website
