Our Events

Orange County Triathlon – 10/10/2021

The Orange County Triathlon starts at BEAUTIFUL Lake Mission Viejo. The Duathlon starts with a fast 2K run before joining the triathletes on the bike. The 40K bike course is a gradual climb up Santiago Canyon Road before a fast ride downhill to T2. The 10K run takes you on paths and trails leading you back to cheering crowds at Lake Mission Viejo.


Pacific Coast Triathlon – 9/25/2021

The Pacific Coast Triathlon starts at beautiful Crystal Cove State Beach. The bike course rolls along a closed Pacific Coast Hwy and then run on the Crystal Cove Path that overlooks the ocean on one side and Pacific Coast Highway on the other. The run takes you through the historical cottages and, if the tides cooperates, the run goes along the beach and back up the path for an amazing finish overlooking the ocean.

Join us for one, or both, of these amazing events in 2021!

Sign up for the Orange County International Triathlon or Duathlon on October 10, 2021

Sign up for the Pacific Coast Triathlon or Duathlon on September 25, 2021

Athlete Experience

What our participants say

“The Orange County Triathlon and Pacific Coast Triathlon are two of the best races in California. The OC Tri is one of the most challenging bike and run courses (after a very pleasant lake swim in Mission Viejo). The Pacific Coast Triathlon combines the challenge of an open water swim in the ocean with the potential for surf, and several challenging hills on the bike and run course in one of the most scenic areas of Southern California. I always enjoy going out to do some practices on both of these courses to get ready and get a “home field” Advantage.”

Michael Collins Nova Masters & Multisports OC

“I have been racing triathlons in Southern California since the late 1970’s, and two of my all-time favorite events are the Orange County Triathlon and the Pacific Coast Triathlon. When you combine epic courses with great history, the outcome tends to be classic events!”

Bob Babbitt The Host of Babbittville Radio

About us

The OC Tri Series multisport events have everything an athlete looks for. Each of our events are at beautiful locations and the race courses are safe and fun to do. There are great giveaways. It is a truly amazing athlete experience!

Thank you to our Sponsors