Folsom Lake International Triathlon

The Jewel of the Sierra Nevada

November 7-8, 2026

Welcome to the 2026 Rio Del Lago Endurance Runs Presented by Altra!

🎉 Celebrating 25 Years of the Rio 100 & 5 Years of the Rio 50K!

The celebration is on! The Rio Del Lago Endurance Runs presented by Altra return on November 7, 2026, marking the 25th anniversary of the legendary Rio 100 Mile Endurance Run and the 5th running of the fan-favorite Rio 50K.

Whether this is your first Rio or your twenty-fifth, we’re doing cartwheels to welcome you to this milestone year. Together, we’ll honor a quarter century of endurance, community, and trail magic on one of Northern California’s most iconic courses.

🌄 About the Races

Rio 100 Mile Endurance Run presented by Altra

A true test of grit, determination, and heart. The Rio 100 takes runners on a breathtaking journey from Folsom to Auburn and back, showcasing miles of rolling singletrack, river views, and the rugged beauty of the Sierra foothills.

Rio 50K Endurance Run presented by Altra

Now in its 5th year, the Rio 50K starts alongside the 100 milers at Beal’s Point and follows the scenic early miles of the course. With stunning views along Folsom Lake, Lake Natoma, and the infamous Johnny Cash Trail, it’s the perfect distance for your first ultra or your fastest 50K yet!

🌟 A Milestone Year — A Legendary Experience

As we celebrate 25 years of Rio, expect an unforgettable weekend filled with tradition, camaraderie, and celebration. From world-class race organization and well-stocked aid stations to the warmth of our incredible volunteers, this year’s event will capture everything that makes Rio Del Lago truly special.

🎽 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

• Neversecond Gels on Course

• Skratch Hydration on Course

• B-Tag Chip Timing

• Bob and Brandt's Breakfast Bistro

• Chef Tim’s “Soup for the Soul”

• Beer Garden

🏕️ Plan Your Race Weekend

Visit our official website for detailed race information, course maps, and lodging options in our host city of Folsom, California.

💛 Join the Celebration

Be part of history as we honor 25 years of the Rio 100 and 5 years of the Rio 50K — a milestone weekend filled with tradition, community, and endurance.

25 Years Strong. 25 Years of Grit. 25 Years of Rio.

We can’t wait to celebrate this special year with you on the trails!

– The NorCalUltras Team

DESCRIPTION:

A FAMILY-FRIENDLY, ALL-COMERS 3-KILOMETER (1.86 MILE) FUN RUN AND WALK THAT STARTS ON WELLINGTON WAY NEAR THE GRANITE BAY HIGH SCHOOL PARKING LOT, AND VENTURES ALONG EAST ROSEVILLE PARKWAY, TRAVELS DOWN HILLSBOROUGH DRIVE, AND VENTURES BACK ALONG THE PEDESTRIAN SIDEWALKS OF EUREKA ROAD AND FINISHES IN FRONT OF GRANITE BAY HIGH SCHOOL ON WELLINGTON WAY.

6k course does 2 loops of the 3k course -- reversing course and doing it backwards!!!

3k: Clockwise

6k: Clockwise, then Counter-Clockwise

Date:

Thursday, November 26th, 2026

Time:

7:30am - 6k

8:00am - 3k

Location:

Wellington Way, in front of

Granite Bay High School,

#1 Grizzly Way,

Granite Bay, CA 95746

Parking:

GBHS Parking lot, or on the street along Wellington Way

Cost:

$35.00 early bird 07/31/2026-09/30/2026

$45.00 regular 10/01-10/31

$50.00 late 11/01-11/25

No Race Day Registration!

No Refunds unless extenuating circumstances (email me a love letter for refund consideration).

Additional online processing fee

bib, t-shirt, medal, CHIP timing, post-race snacks, and water and age group awards!

Course:

Starts on Wellington Way in front of Granite Bay High School, and follows a 1.86 mile, 3 kilometer clock-wise loop traveling along the pedestrian sidewalks only along East Roseville Parkway, Hillsborough Drive, Eureka Road, and back to Wellington Way. Course will be lightly traffic controlled by CHP and/or PCSO.

6k course does 2 loops of the 3k course -- reversing course and doing it backwards!!!

3k: Clockwise

6k: Clockwise, then Counter-Clockwise

Packet Pick-Up:

Granite Bay Public Library,

Wednesday, November 25th 2026

11am-6pm

Beneficiary:

Fieldhaven Feline Center, Lincoln

To Volunteer:

e-mail [email protected]

2026 TBF Open Water Swim Class

The Open Water Swim Class meets at 6:30 p.m. at Beal's Point, Folsom Lake each Monday and Wednesday for Coached Open Water Swim workouts for all levels.

Event details and schedule

2026 TBF Open Water Swim Class: May 4th – August 31st.

The TBF Open Water Swim Class has been teaching swimmers for over 20 years at Folsom Lake! This class is perfect for anyone wishing to learn how to swim stronger and with more confidence in the open water. This class will meet twice a week and teach you proper swim technique and how to improve your swim speed, stamina, and efficiency.

The TBF Open Water Swim Class is great for anyone wishing to learn how to swim strong and with confidence in the open water. This class will teach you proper swim technique and how to improve your swim speed, stamina, and efficiency. Each Class meeting offers beginner, intermediate, and advanced lesson plans/swim workout options.

The Open Water Swim Class meets every Monday and Wednesday at Beal's Point, Folsom Lake. We will have one class at 6:30 p.m. with different levels.

DROP INs available at each workout for $25.

The Open Water Swim Class features:

•Professional swim coaching

•Learn how to breathe and develop your stroke

•Learn open water techniques like sighting and swimming straight

•Learn about drafting and pacing techniques

•Monthly swim time trials and performance testing

•GPS marked o/w swim course

•Water safety kayakers

•Each session includes lesson plans for beginner, intermediate, and advanced swimmers

•Get real-time feedback and personalized attention at every workout

•Meet new people and establish swim training partners

•Class meetings to get your swim stronger than ever

•Improve your swimming for IRONMAN California

•Build your relationship with the water and swim like a fish, guaranteed!