This summer's grand finale triathlon takes place at Allan Yorke Park in Bonney Lake, WA, where you'll swim in the pristine waters of Lake Tapps, cycle across Pierce County's scenic farmland, and run beneath the stunning views of Mount Rainier—all wrapped up in the energetic RTB Summer Series community atmosphere. If you tackle all three races in the 2026 RTB series (Black Diamond, Lake Meridian, and Bonney Lake), you'll unlock the exclusive Trifecta Trident award, a prestigious medal honoring your dedication and resilience across the entire season.