IRONMAN Wisconsin
IRONMAN Wisconsin races in Madison on 12 September 2026, with the full distance (3.8 km / 180 km / 42.2 km) and the half (1.9 km / 90 km / 21.1 km) both on the schedule.
The swim is in Lake Monona, and the exit is the part people remember. You run up the helix, the spiral car-park ramp at Monona Terrace, to reach transition: a long steady climb in bare feet on a heart rate that is already high.
The bike is rolling farmland, not flat. The loops through the ridges west of the city contain more short, sharp climbs than the profile suggests, and the full distance here regularly takes longer than a flat course would for the same fitness. Plan the day on that basis.
Mid-September in Wisconsin can be 10°C and wet or genuinely hot. The lake will be warm by then. The morning air probably will not be.
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 Wisconsin?
- Date
- Sunday, 13 September 2026
- Format
- Full Distance / 140.6
- Water temp
- 18.6°C · 65°F
Need to know
When is IRONMAN Wisconsin 2026?
IRONMAN Wisconsin takes place on Saturday, 12 September 2026. Dates can move year to year, so confirm the exact day on the official race page before you book travel.
Where does IRONMAN Wisconsin take place?
Madison, United States
FAQs
What do athletes ask about IRONMAN Wisconsin?
Where is IRONMAN Wisconsin held?
IRONMAN Wisconsin is held in Madison, 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 Wisconsin?
IRONMAN Wisconsin offers Half / 70.3 and Full Distance / 140.6. 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 Wisconsin?
IRONMAN Wisconsin is rated elite (5/5) 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's the water temperature at IRONMAN Wisconsin?
The swim at IRONMAN Wisconsin is around 18.6°C (65°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 Wisconsin?
You enter IRONMAN Wisconsin 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 Wisconsin part of a race series?
Yes, IRONMAN Wisconsin 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.
How should I train for IRONMAN Wisconsin?
Training for IRONMAN Wisconsin depends on your target distance and current fitness. Most athletes follow a structured block of 12–20 weeks for a Half / 70.3 effort. Build a plan tailored to your race date and level with AI Training Plan (https://aitrainingplan.app).
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