September 13, 2026 · Madison, Wisconsin, USA
140.6 mi (226 km)TriathlonFull Iron
Ironman Wisconsin
Rollers. Cheese. Capital.
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Rollers. Cheese. Capital.Course intelligence
Know the course before you race it.
Terrain
Lake Monona swim. Legendary two-loop bike with relentless Wisconsin rollers (5,000+ ft total climb). Two-loop run through UW campus and State Street.
Conditions
September in Madison: 60–78°F, typically pleasant. Midwest humidity but race day is usually good. Occasionally hot.
Aid Stations
Bike aid every 10 miles; run aid every mile. Well-organized and heavily volunteered event.
Key Challenge
The Wisconsin rollers are deceptive — none are long or steep, but the constant up-and-down burns carbs relentlessly. Athletes from flat states consistently under-fuel.
Nutrition answers for Ironman Wisconsin.
How many carbs for Ironman Wisconsin?
What's the deal with the Wisconsin bike course?
Is IM Wisconsin a good PR course?
What are the nutrition hazards on the Wisconsin run?
Any tips for the State Street run?
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