Rexburg RUSH Triathlon 2026

The Rexburg RUSH Triathlon takes place in mid-September at Wakeside Lake, located south of Rexburg, Idaho, near BYU-Idaho. Tri Peaks Epic Events organizes it as the concluding event in their three-race Trifecta series across Eastern Idaho. Available triathlon distances include Sprint and Olympic, alongside Sprint and Olympic duathlon, 5K, 10K, relay, youth, and two-person Sprint team options. The race begins with a swim in the calm waters of Wakeside Lake. Cyclists then proceed through farmland in the upper Snake River region, with runners finishing near the lake. Mid-September mornings can be cool, and the lake water temperature reflects a late-season mountain-west setting rather than a summer event. The variety of individual, relay, youth, run-only, and duathlon events accommodates experienced triathletes, families, and participants interested in the Rexburg course without completing all three triathlon disciplines.