Boulder Triathlon

IRON MAN 70.3 PRESENTS

The Boulder Triathlon

SATURDAY, JUNE 14TH

BOULDER RESERVOIR

4:30am-4:50pm

The IRONMAN^® 70.3^® Boulder triathlon returns to Boulder County, Colorado and the foothills of the Rocky Mountains on Saturday, June 14. Amidst breathtaking views of the majestic Flatirons, athletes will kick off their IRONMAN 70.3-mile journey with a 1.2-mile swim in the Boulder Reservoir before embarking on the 56-mile bike course throughout Boulder County. The 13.1-mile two loop run course will take athletes along the Boulder Reservoir, up 63rd Street to Monarch, and all along the Dam Road before finishing back at Boulder Reservoir.

2025 IRONMAN 70.3 Boulder offers age group qualifying slots 2025 IRONMAN 70.3 World Championship taking place on Nov. 8-9 in Marbella, Spain.

Professional Field:
The 2025 IRONMAN 70.3 Boulder triathlon will feature a field of many of triathlon’s top male athletes battling for a piece of the $20,000 professional prize purse. Highlighting the field are the likes of defending champion Trevor Foley (USA), Colin Szuch (USA), Sam Appleton (AUS), Chris Leiferman (USA), and Matthew Sharpe (CAN). Full list of Pro Athletes

*Start list subject to change

When:

• Thursday, June 12
  • 2:00?p.m. – 6:00 p.m. – IRONMAN Village and Athlete Check-In open – Boulder Reservoir
• Friday, June 13 
  • 9:00?a.m. – 4:00 p.m. – IRONMAN Village and Athlete Check-In – Boulder Reservoir
  • 9:30 a.m. – 4:30 p.m. – Mandatory Bike Check-In – Boulder Reservoir
• Saturday, June 14 – Race Day 
  • 4:30 a.m. – 7:00?a.m.?- Transition area open – Boulder Reservoir
  • 7:05 a.m. – Professional Men Race Starts – Boulder Reservoir
  • Approx. 10:40 a.m. – First finisher expected at the finish line.
  • Approx. 4:50 p.m. – Race Ends?(8.5 hours after the last athlete enters the water)

        *All times listed are in Mountain Time

Applying For Media Credentials:
Registration for media credentials to the upcoming 2025 IRONMAN 70.3 Boulder triathlon taking place on Saturday, June 14 is now available. Media interested in covering the event must register at the link below by Friday, June 13 at 12 p.m. MST to be considered for media credentials.

CREDENTIAL REQUESTS ON RACE DAY WILL NOT BE APPROVED. Media who arrive on day of race without proper registration, will not be provided credentials or access to race venues.

Apply for credentials HERE

Additional Links:

• 2025 Event Logo
• Images (Patrick McDermott & Kyle Rivas/ Getty Images for IRONMAN)
• Event Schedule
• Course Maps
• Athlete Guide
• Event Facebook Page
• Event Website

More Info
The IRONMAN Group operates a global portfolio of events that includes the IRONMAN^® Triathlon Series, the IRONMAN^® 70.3^® Triathlon Series, 5150™ Triathlon Series, the Rock ‘n’ Roll^® Running Series, IRONKIDS^®, premier running events including the Standard Chartered Singapore Marathon™ and City2Surf^®, UTMB^® World Series trail-running events including the Canyons Endurance Runs™ by UTMB^®, Tarawera Ultra-Trail™ by UTMB^® and Ultra-Trail Australia™ by UTMB^®, Epic Series™ mountain bike races including the Absa Cape Epic^®, road cycling events, and other multisport races. The IRONMAN Group is the largest operator of mass participation sports in the world, providing participants the benefits of endurance sports through the company’s vast offerings. Since the inception of the iconic IRONMAN^® brand and its first event in 1978, athletes have proven that ANYTHING IS POSSIBLE^® by crossing finish lines around the world. Beginning as a single race, The IRONMAN Group has grown to become a global sensation with hundreds of events across 55+ countries.