IRONMAN 70.3 Boulder 2026

The IRONMAN 70.3 Boulder features a 1.2-mile swim in Boulder Reservoir, presenting a significant challenge for triathletes. The event is set against the region's dramatic landscapes, inviting participants to test their endurance amidst natural beauty. Following the swim, the 56-mile bike course winds through rolling hills along the Flatirons. The race concludes with a run on Boulder's trails, taking athletes through varied terrain to the finish line.