Cal Tri Castaic Lake

2026 Cal Tri Castaic Lake - 6.20.25

18 EVENT OPTIONS. 6 Olympic distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 1640 Yard Swim & 10K Run), 6 Sprint distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 400 yard Swim & 5K Run) and 6 Youth Sprint distance events (Triathlon, RunBikeRun, SwimBike, SwimRun, 400 yard Swim & 5K Run). Triathlon = swim + bike + run. Typically, the swim and run distances are standard but the bike distance varies from race to race. Check out the course maps for more detailed information.

CASTAIC LAKE. 
The 35th annual Castaic Lake Triathlon takes place at scenic Castaic Lake just 20 miles north of Los Angeles. The Castaic Lake Recreation Area, located just north of Santa Clarita, is an 11,200-acre multi-use facility with two lakes, boating, world class fishing, hiking, walking, horseback riding, wake boarding, jet-skiing, camping, picnicking, kayaking, and sailing.  August is a great time to enjoy the water in the high 60s, and a staging area aptly named Paradise Cove. "Tri-cation" Friday night camping available through Castaic Lake.

THE COURSE. 
The swim course is a modified V shape in Paradise Cove at Castaic Lake, with 8 lifeguards in the water on paddleboards.  The bike course then goes out on back roads to limit your interaction with cars.  The bike course does include some U-turns on back roads to allow this, so athletes should slow down at the turn around points.  The run is primarily on the rolling trails overlooking Castaic Lake. 

WHO WE SUPPORT
All proceeds will benefit the Canyon High School Cross Country and Track Teams (we've been doing this for 33 years to support our programs).  

This is a great triathlon for new triathletes.  For years our coaches and athletes have encouraged new triathletes (young and old), and created a welcoming atmosphere of support.  We offer an enjoyable experience for triathletes of all experience levels.  

AIR TEMPERATURE (AVG).
Mid June temperatures are often cooler in the morning, with early morning fog burning off to reach the mid 80s.  Our event will possibly be around 60 degrees.

WATER TEMPERATURE (AVG). 

Water temps in June typically range in the mid to high 60s.  Email updates will be sent out closer to the race with updates. Use the 20% 2026CALTRI discount code at blueseventy. Note: Fusion wetsuits not eligible for discount.

Join fellow runners on June 14, 2025 for the Cal Tri Castaic Lake. It's a fantastic 5K, 10K featuring a flat and fast course in Castaic.