Boulder Ironman 2025. 2025 general registration opens soon. Ironman 70.3 june 14, 2025 this half ironman takes place at the boulder reservoir with a spectacular rocky mountain backdrop.
Ironman and the greater zion convention & tourism office announced that following 15 years of ironman® events in this iconic location, a chapter will close when the st. Your chance to lock in your 2025 season starts now!