Tri the Rock Youth Triathlon

Castle Rock, CO

Tri the Rock Youth Triathlon


Due to COVID-19 this year’s event has been postponed until fall. The new date is now Sunday, September 13th.  


We invite YOU to experience the 15th annual, Tri the Rock, youth triathlon. Tri the Rock is designed for, and open to youth ages 5 to 18. 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)

NEW! 15-18 years

  • 100 meter swim (four pool lengths, down and back twice)
  • 16 kilometer bike ride
  • 3 mile run

11/12 years & 13/14 years

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

7/8 years & 9/10 years

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

 5/6 years

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



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


  • 15-18 year olds begin at 7:30 am; the rest of the age groups will follow in order of oldest to youngest.
  • 5/6 year olds begin at approximately 10:30 am (once all of the other age groups are complete and the course is clear, times are estimated)

Packet Pick Up and EXPO

This year you can pick pick up your packet on Saturday, September 12th 12 pm to 2 pm at the Miller Activity Complex.

Saturday pickup is highly recommended to avoid lines on event day and to help with social distancing!

Important Updates and Changes

  • Safety for athletes, staff, and volunteers will continue to be our top priority.  Social distancing measures will be in effect.  Masks will be worn by our staff and we will require masks to be worn at check-in and when athletes are around others while not competing.
    *We all enjoy the spirit of spectators but we ask that you limit to two family members.  
  • Bike transition area for ages 7 & up has been relocated to the larger parking lot northwest of the original transition zone to help in social distancing.
  • Staff will not be assisting swimmers in the pool. If parents anticipate that their child may need assistance, parents are encouraged to be in the pool with their child (these will be the ONLY parents allowed in the pool area).  If a child has an unexpected challenge in the pool, our staff will jump in and remove the child, resulting in DNF for the swim portion.  The child may then continue to the transition area to complete the other disciplines of the race.

Free Informational Clinic

First time competing at Tri the Rock? Join us for the clinic at Butterfield Park to learn all the ins and outs of this triathlon. Registration is required and space is limited.

Can't make the clinic? Please load and review the clinic information.


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. If you park at the Butterfield Park parking lot, please plan on staying for the entire event.

Stay up to date on all of the event details at