Cedar River Triathlon
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Event details
The Cedar River Triathlon takes place at Lake Wilderness in Maple Valley, WA on May 10, 2026. The event is organized by Sammamish Running. Entry categories and listed prices include a full super sprint triathlon, a relay super sprint, and a kids Splash n Dash. All entrants receive a long sleeve mesh t-shirt and all finishers receive a Cedar River medallion. Finish-line refreshments include apples, bananas, and oranges. A photo finish is used.
Course and logistics
Distances listed for the super sprint category are:
- 0.25 mile swim
- 14 miles bike
- 4 miles run
The swim is held in Lake Wilderness; wetsuits are allowed and encouraged. The bike course combines about 3 miles of road/asphalt with hard packed dirt and limestone on the Cedar River Trail, includes a slight downhill to a turnaround, and also features about 2 miles of asphalt/bike path and a trestle crossing. The organizer states the staircase on the course has been removed for a smoother transition onto the Cedar River Trail.
Safety and support include certified lifeguards in the water, AED availability, certified flaggers at intersections, police and Search and Rescue notification, on-course water, Gatorade, gels, first aid, and ample parking. All bike handlebars must be plugged. Visit the organization's website for the most recent information.
