Saturday, June 13, 2026 · Boulder, CO, United States
101 days until race day
IRONMAN 70.3 Boulder is an IRONMAN 70.3 race held in Boulder, CO, United States. The race includes a reservoir swim, a demanding bike course with significant climbing, and finishes with a hilly run leg that tests late-race fitness.
Reservoir
1.9 km / 1.2 mi
Hilly
90 km / 56 mi
Hilly
21.1 km / 13.1 mi
Focus on open-water comfort and sighting in calm-water conditions typical of reservoir swims.
Prioritize climbing-specific bike workouts with sustained efforts at threshold to prepare for the demanding elevation.
Train on hilly routes and focus on power hiking steep sections efficiently — knowing when to walk can save your race.
Practice race-day nutrition during training — dial in your fueling plan for the bike and run to avoid bonking.
Transition's AI coach builds a training plan specifically adapted for this course. Your plan accounts for the reservoir swim conditions, the hilly bike terrain, and the hilly run profile — so you show up on race day fully prepared.
Your plan adjusts weekly based on your progress, recovery, and schedule changes.
Workouts target the exact demands of this course's swim, bike, and run profiles.
Nutrition rehearsal, taper optimization, and pacing strategy built into your plan.
“Transition has helped me improve my Ironman training more than any other method I've encountered in my triathlon journey. It's incredibly precise and personalized.”
Carlos Rebelo — Triathlete
Our AI-powered ironman 70.3 plan adapts to your fitness, schedule, and this specific course. Start training smarter today.
View IRONMAN 70.3 PlanTraining for IRONMAN 70.3 Boulder requires a structured plan that addresses the specific course demands: a reservoir swim, hilly bike, and hilly run. Transition's AI coach builds a personalized plan that adapts to your fitness level and progressively prepares you for these exact conditions.
IRONMAN 70.3 Boulder is an IRONMAN 70.3 race held in Boulder, CO, United States. The race includes a reservoir swim, a demanding bike course with significant climbing, and finishes with a hilly run leg that tests late-race fitness. The race takes place in Boulder, CO, United States and attracts athletes from around the world.
Most athletes need 16-20 weeks of dedicated training for a IRONMAN 70.3. This allows sufficient time for base building, race-specific preparation, and a proper taper. Transition's AI coach can create a plan that fits your timeline and current fitness.
