Tri the Rock Youth Triathlon

Castle Rock, CO

Tri the Rock Youth Triathlon


It's waiting for you. All you have to do is try...

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.

This event supports physical education programs at local schools! For every Douglas County student that participates, $10 will go back to their school!! The school with the most participants will also get to proudly display the Tri the Rock traveling trophy for an entire year!!


  • 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 20th 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. Look here for more information...... First Timer Clinic

**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.

Stay up to date on all of the event details at Tri-the-Rock.