Tri The Rock Youth Triathlon

Castle Rock, CO

Tri The Rock Youth Triathlon


Online Registration is now closed. You may register during packet pickup on Saturday (5/18) at the Castle Rock Recreation Center from 12PM to 2PM. We look forward to seeing you!

We invite YOU to experience Tri the Rock, whether this is your first race or you've been competing for years! Tri the Rock is designed for, and open to, kids ages 5 to 14. Come for a great day of fun, food, prizes and sport!

Age Divisions:

Tri the Rock competes based on age on RACE DAY. Be sure to register and prepare accordingly.

Race Distances (by age category)

5 - 6 years

  • 25-meter swim (one pool length)
  • 1-kilometer bike ride (one lap around Butterfield Park)
  • 500-meter run

7 - 8 years & 9 - 10 years

  • 50-meter swim (two pool lengths, down and back)
  • 4-kilometer bike ride
  • 1-kilometer run

11 - 12 years & 13 - 14 years

  • 100-meter swim (four pool lengths, down and back twice)
  • 8-kilometer bike ride
  • 2-kilometer run


You DO NOT need a USAT number to participate in Tri the Rock.


  • 13/14 year olds begin at 8:00 am; the rest of the age groups will follow in order of oldest to youngest.
  • 5/6 year olds begin at 11:00 am (once all of the other age groups are complete, times are estimated)

Advance Packet Pick Up

Save time on race morning and pick up your packet early on May 18th from 12 pm to 2 pm at the Castle Rock Rec Center.

First Timer Clinic

Join us for a FREE first timer clinic to learn all the ins and outs of the triathlon. Registration is required and space is limited.

Can't make the clinic? Check this out.

Tri the Rock Training Camps

Learn new skills or increase your awesomeness with a USAT certified coach. Fees for weekend training camps include race registration and are limited to small group sizes for individualized instruction. Training camp dates are April 26-28, May 3-5.

Need more experience in the water???

Check out our Learn to Swim classes

**On event day, please be sure to allow plenty of time to rack your bike and complete the athlete check-in prior to the start of the event. Also be aware there will be construction on parts of Butterfield Crossing. If you park at Meadowview Elementary or Butterfield Park parking lot, please plan on staying for the entire event. Stay up to date on all of the event details at Tri-the-Rock.