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Triathlon Atlas

Half distance · 11 September 2027

IRONMAN 70.3 Wisconsin

Madison, United States

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Middle distance
Terrain
Road
Swim
1.9 km
Bike
90 km
Run
21.1 km
Date
11 Sept 2027
Registration
Open
Swim venue
Lake
Average water temperature
24 °C
Bike profile
Rolling
Bike elevation gain
635 m
Run profile
Hilly
Run elevation gain
75 m
High air temperature
27 °C
Low air temperature
14 °C
Overall cut-off
8 h 30 min
Altitude
272 m
Swim start
Rolling start

Edition history

202612 Sept 2026Held
20256 Sept 2025Held
20247 Sept 2024Held
20239 Sept 2023Held
202210 Sept 2022Held
202112 Sept 2021Held
20199 Jun 2019Held
201810 Jun 2018Held
201711 Jun 2017Held

How the day is laid out

The swim is held in a lake. The wetsuit call is made on race morning, against the temperature measured then.

The organiser publishes 1.9 km of swimming, 90 km on the bike and 21.1 km of running.

The swim uses a rolling start: athletes enter the water a few at a time. The water is usually around 24 °C at this time of year.

The bike course is rolling, with about 635 m of climbing.

The run course is hilly, with about 75 m of climbing.

Typical temperatures for the month run from 14 to 27 °C. The overall cut-off is 8 h 30 min.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    24 °C · median 21 °C

    The 35th warmest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    27 °C · median 25 °C

    The 61st hottest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    635 m · median 569 m

    The 48th hilliest of the 105 middle-distance races with a figure, across every circuit.

3

races of this distance pair a rolling bike with a hilly run, out of 159. 58 share the bike profile alone.

45

races across every distance fall in September, out of 354.

68

races are held in North America. 11 of them in the same month as this one.

Questions about this race

When is IRONMAN 70.3 Wisconsin 2027?
IRONMAN 70.3 Wisconsin is held on 11 September 2027 in Madison, United States. Registration is open on the official race page.
Is a wetsuit allowed at IRONMAN 70.3 Wisconsin?
Most likely. The average water temperature is 24 °C, below the 24.5 °C limit up to which wetsuits are allowed for age-group athletes. The official call is made on race morning.
What is the cut-off at IRONMAN 70.3 Wisconsin?
The course closes 8 h 30 min after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN 70.3 Wisconsin?
The bike course climbs about 635 m, the 48th hilliest of 105 half-distance races with a figure. The bike is labelled rolling and the run hilly. Expect highs of about 27 °C on race day.

Where to stay

Hotels and rentals around the race venue, for the nights around race day.

Suggested stay: 9 Sept 2027 to 12 Sept 2027

The map is provided by Stay22. Bookings are made with the provider.

Races of the same distance in the same region

Entries are handled by the organiser

Registration and the athlete guide are on the official race page.

Open the official race page