Erie Half & 5k

Get ready for a sun-soaked adventure and a fantastic mid-season challenge with our 13th Annual Dog Days 5K, 10K & Half Marathon, benefiting Do Over Dogs! Held in a central location between Denver and Boulder, our courses wind northeast along the scenic Big Dry Creek Trail. As you run, you’ll enjoy breathtaking views of the Flatirons on the horizon. Our trail is perfect for dogs, featuring a generous amount of soft surface along the 10K and half marathon routes. Plus, we have a special dog division to award the fastest pups at each distance and a dog-themed costume contest for extra fun! And continue the challenge by participating in the endless series counterpart, Fa La La, in December.

Fun for all, from newcomers of any age racing for the first time to veteran competitors looking to test their fitness, all in a friendly, welcoming environment.

We are back at CU Potts Field again offering a full schedule of events.

BRR Members Save $5 off adult pricing!

Use the email address associated with your membership. Non-Members can easily join in the registration process to immediately save.

Get ready for a functional fitness challenge built for all abilities.

Cerox is back! This time you can choose between Cerox or Cerox Iron.

You’ll take on 8 fitness zones designed to test your endurance, strength, and grit. Choose your level of challenge:

Cerox: The event will feature 8 fitness zones plus running.

Cerox Iron: The same zones as the classic Cerox event, but without the running.

You can sign up as an individual or with a partner team. Teams can divide the zone work however they choose.

Estimated Wave Time:

11 AM: Cerox Individual

12 PM: Iron Individual

1 PM: Cerox Teams

2 PM: Iron Teams

Get your tickets now and be part of the action on February 28th!

Cerox Workout:

400M Run

Zone 1: 400M Row Erg

400M Run

Zone 2: 30 Deadlifts - 155/105

400M Run

Zone 3: 400M Ski Erg

400M Run

Zone 4: 20 Sandbag Over 4' Bar - 100/70

400M Run

Zone 5: 75M Walking Lunges - RAM 55/33

400M Run

Zone 6: 200M Farmers Carry - 2x 60's/ 40's

400M Run

Zone 7: 30 Cal. Echo Bike

400M Run

Zone 8: 30 Burpees to Plate

Cerox Iron Workout:

Zone 1: 400M Row Erg

Zone 2: 30 Deadlifts - 155/105

Zone 3: 400M Ski Erg

Zone 4: 20 Sandbag Over 4' Bar - 100/70

Zone 5: 75M Walking Lunges - RAM 55/33

Zone 6: 200M Farmers Carry - 2x 60's/ 40's

Zone 7: 30 Cal. Echo Bike

Zone 8: 30 Burpees to Plate

NO Race Day Registrations

Fun for all, from newcomers of any age racing for the first time to veteran competitors looking to test their fitness, all in a friendly, welcoming environment.

Held at the Historic Potts Field, home of the University of Colorado Track & Field Team, the facilities offer the full range of track and field events and is one of the only meets in Colorado that offer a chance to run the Steeplechase or throw the javelin.

If you've been wanting to try a track race and run in the footsteps of CU stars such as Jenny Simpson, Emma Coburn, Joe Klecker, Val Constien, Dathan Ritzenhein, Alan and Shayne Culpepper, and Kara and Adam Goucher, now is your chance!

Founded in 1979, the Eldorado Run for the Cure is the longest operating charitable footrace in the State of Colorado. All proceeds from the annual four-mile run benefit the Colorado Cancer Foundation's life saving work, from funding oncology research at the University of Colorado's (CU) Division of Medical Oncology to aiding patients at the CU Hospital in Aurora, CO.

Each year, the run has developed and grown, and in 2023 a new course was introduced, routing participants along the scenic South Boulder Creek, which winds through the high cliff walls of historic Eldorado Canyon.