The Lost Trail 5K & Half Marathon

The Good Dog-Dirty Dog Trail Runs feature a 5K and 10K for runners alone or with their dogs! Finisher Medals for all runners at the Good Dog-Dirty Dog plus a race bandana for your dog.

Event details and schedule

The Good Dog-Dirty Dog Trail Runs

5K & 10K

This event is for walkers, runners, and their dogs! We are excited to offer this event for athletes and their dogs and hope everyone has a fun time.

The Good Dog 10K will start at 8:00 a.m. and the 5K will start at 8:10 a.m. in the Granite Beach area at Folsom Lake SRA. The course will have aid stations at the half way point for both walkers and their dogs. Runners will receive a Good Dog Dirty Dog Finisher Medal, plus a race bandana for their dog. Additional dogs can be signed up to accompany the walker and dog #1 for a fee of $10 per dog.

We will have a 'Runner only - No Dog' category with individual awards to the top male and female runners in this category.

Included for each competitor is Good Dog-Dirty Dog Finisher Medal plus a race bandana for your dog.

Good Dog-Dirty Dog Commemorative race t-shirts are available for pre-order for an additional $20.

Awards will be presented as follows:

First, second, and third place in each of three divisions for the Dirty Dog 5K & 10K Runs:

Small Dog (up to 25 lbs), Medium Dog (26 to 60 lbs) Large Dog (61 to 99 lbs+) Extra Large Dog (100 to 140 lbs) and Extra Large Dog (141 lbs+) will each receive an award.

Find out about our RACE for FREE Athlete Volunteer program by emailing [email protected] to sign up.

Race fees increase on race day.

TBF Racing has a No Refund policy on all of our events. A Refund requested prior to race week will be given a TBF Race credit for the amount of the entry fee minus a $25 processing fee. Credits are not given during race week. Race transfers are allowed from one TBF Racing event to another within a one-year time frame. There is a $25 transfer fee. Transfers are not allowed during race week. ALL TBF Racing events are held Rain or Shine.

Start Times:

Good Dog - Dirty Dog 10K - 8 am

Good Dog - Dirty Dog 5K - 8:10 am

The Gold Rush Growler 10 Mile & 5K Trail Runs

Enjoy beautiful well-marked courses at Folsom Lake SRA for a 5K or 10 Mile run followed by ice-cold IPA beer.

Event details and schedule

The Gold Rush Growler 5K & 10 Miler

Granite Beach, Folsom Lake SRA

The Gold Rush Growler 10 Mile Trail Run and 5K will have New Courses for 2026 - along with post race ice cold beer and a custom Gold Rush Growler Finisher Beer Glass! Commemorative Gold Rush Growler race shirts are available for $20 in mens and womens cut.

The Gold Rush Growler Trail Runs start and finish at Granite Beach, Folsom Lake SRA with beautiful scenic courses along the shoreline and on single track trails.

First place Overall Male and Female in The Gold Rush Growler 10 Miler & 5K will receive Overall Champion Awards. There will be awards three deep in each ten-year age group for The Gold Rush Growler 10 Miler and the 5K Run plus Gold Rush Growler Beer Glasses.

Packet Pick Up Information

Race packets will be available race morning from 6:30 am to 8 am at the race site.

Race Day Schedule

6:30 Registration/Packet Pick up opens

7:00 Race announcements begin

8:00 Start of Gold Rush Growler 10 Miler

8:10 Start of Gold Rush Growler 5K

Refund and Transfer Information

TBF Racing has a No Refund policy on all of our events. A Refund requested prior to race week will be given a TBF Race credit for the amount of the entry fee minus a $25 processing fee. Credits are not given during race week. Transfers are allowed from one TBF Racing event to another within a one-year time frame. There is a $25 transfer fee. Transfers are not allowed during race week. ALL TBF Racing events are held Rain or Shine.

Race for FREE Information

Our Race for FREE Athlete Volunteer Program offers a chance to get involved with multi-sport events, have fun, and earn a $50 TBF Racing Volunteer voucher good towards entry fees at any of our events this year. Each volunteer shift is 4 hours. We ask volunteers to reserve a volunteer position at any of our events by emailing Volunteer Director [email protected] as our volunteer positions will fill up quickly.

Race fees increase on race day.

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]