IRONMAN Boulder
IRONMAN Boulder, part of the IRONMAN series, is a triathlon held in Boulder, United States. The 2026 edition took place on Saturday, 13 June 2026. It is run over the Half / 70.3 distance.
Who it's for
Built for experienced triathlon athletes.
Good fit if you…
- are experienced in triathlon and want a hard race
- want a well-known, high-status race
Maybe not if you…
- are brand-new to triathlon: start with something shorter
What should you know about IRONMAN Boulder?
- Date
- Saturday, 13 June 2026
- Format
- Half / 70.3
- Water temp
- 19.2°C · 67°F
Need to know
When is IRONMAN Boulder 2026?
IRONMAN Boulder takes place on Saturday, 13 June 2026. Dates can move year to year, so confirm the exact day on the official race page before you book travel.
Where does IRONMAN Boulder take place?
Boulder, United States
When has IRONMAN Boulder taken place before?
FAQs
What do athletes ask about IRONMAN Boulder?
Where is IRONMAN Boulder held?
IRONMAN Boulder is held in Boulder, the United States. The race page has the venue location and a map, and links straight through to the official site for the precise start area.
What distances can you race at IRONMAN Boulder?
IRONMAN Boulder offers Half / 70.3. The Half / 70.3 is a 1.9 km swim, 90 km bike and 21.1 km run. Pick your distance and enter on the official site. Each format usually has its own start wave and cut-offs.
How hard is IRONMAN Boulder?
IRONMAN Boulder is rated competitive (4/5) for difficulty on FindMyNextRace, based on its distance, terrain, and the level of the field. Use that as a guide and match it to your current fitness before you commit.
What is the terrain like at IRONMAN Boulder?
IRONMAN Boulder is held on road and open-water terrain. Terrain shapes your pacing, kit, and shoe choice, so factor it into your prep. The official course page has the detailed route.
What's the water temperature at IRONMAN Boulder?
The swim at IRONMAN Boulder is around 19.2°C (67°F), based on the official average for the venue. Water temperature drives wetsuit rules, so check the organiser's current wetsuit policy before race day.
How do I enter IRONMAN Boulder?
You enter IRONMAN Boulder through the official organiser. Registration is handled on their site, and FindMyNextRace links you straight there. Places for popular editions can sell out early, so register as soon as entry opens.
Is IRONMAN Boulder part of a race series?
Yes, IRONMAN Boulder is part of the IRONMAN series. Series events often share a qualification, points, or championship pathway, so if you're chasing the series, check how this race fits its calendar.
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