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Triathlon Atlas

Full distance · 6 December 2026

IRONMAN Western Australia

Busselton, Australia

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Full distance
Terrain
Road
Swim
3.8 km
Bike
180 km
Run
42.2 km
Date
6 Dec 2026
Registration
Sold out
Swim venue
Bay
Average water temperature
21 °C
Bike profile
Flat
Bike elevation gain
304 m
Run profile
Flat
Run elevation gain
104 m
High air temperature
23 °C
Low air temperature
16 °C
Overall cut-off
17 h
Altitude
4 m
First edition
2004
Swim start
Rolling start

Edition history

20257 Dec 2025Held
20241 Dec 2024Held
20233 Dec 2023Held
20224 Dec 2022Held
20215 Dec 2021Held
20191 Dec 2019Held
20182 Dec 2018Held
20173 Dec 2017Held
20164 Dec 2016Held

How the day is laid out

The swim is held in a bay, over 2 loops. An average of 21 °C is close to the threshold where wetsuit rules start to tighten. Plan for both answers and check the call on race morning.

The bike leg is labelled flat and runs over 2 loops.

The run is labelled flat, over 4 laps.

A flat bike followed by a flat run is the most predictable combination on the calendar. It removes climbing and the descents that come with it, so power output stays constant for the whole bike leg and wind becomes the main variable.

Expect air between 16 °C and 23 °C on race day. A spread of 7 degrees across the day matters as much as the peak, because what you wear at the swim exit is rarely what you want at the far end of the bike.

The bay has varied by four degrees

ironman.com measured Geographe Bay at 23 °C on race day in 2023, then at 19 °C in 2024 and 2025. The swim course now stays closer to the shore to limit exposure to the weather. Athletes leave the water after the first lap and run a short stretch of beach before the second. Cut-offs from each athlete's start: 2 h 20 min for the swim, 10 h 30 min for the bike.

Source: ironman.com, course page, read on 22 October 2026.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    21 °C · median 22 °C

    The 16th coldest of the 48 full-distance races with a figure, across every circuit.

  • High air temperature

    23 °C · median 25 °C

    The 15th coolest of the 52 full-distance races with a figure, across every circuit.

  • Bike elevation gain

    304 m · median 1130 m

    The 6th flattest of the 43 full-distance races with a figure, across every circuit.

13

races of this distance pair a flat bike with a flat run, out of 55. 19 share the bike profile alone.

13

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

28

races are held in Oceania. 2 of them in the same month as this one.

Questions about this race

When is IRONMAN Western Australia 2026?
IRONMAN Western Australia is held on 6 December 2026 in Busselton, Australia. The race is sold out.
Is a wetsuit allowed at IRONMAN Western Australia?
Most likely. The average water temperature is 21 °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 Western Australia?
The course closes 17 h after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN Western Australia?
The bike course climbs about 304 m, the 6th flattest of 43 full-distance races with a figure. The bike is labelled flat and the run flat. Expect highs of about 23 °C on race day.

Where to stay

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

Suggested stay: 4 Dec 2026 to 7 Dec 2026

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