This event is in the past.It took place on June 13, 2026 at Boulder Reservoir.
Sports
Sports🕓Start time is 5 a.m.; plan early arrival
⛔Full facility closure all day; plan around road closures
🅿️Use overflow parking lots; main areas restricted
Half-distance triathlon combining a 1.2-mile swim, 56-mile bike, and 13.1-mile run at Boulder Reservoir. Around 3,000 athletes compete in this full-day event.
endurance racing
multi-sport competition
triathlon
half-iron distance
SportsSports🕓Start time is 5 a.m.; plan early arrival
⛔Full facility closure all day; plan around road closures
🅿️Use overflow parking lots; main areas restricted
Half-distance triathlon combining a 1.2-mile swim, 56-mile bike, and 13.1-mile run at Boulder Reservoir. Around 3,000 athletes compete in this full-day event.
endurance racing
multi-sport competition
triathlon
half-iron distance