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Triathlon Atlas

Half distance · 6 December 2026

IRONMAN 70.3 Western Australia

Busselton, Australia

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
6 Dec 2026
Registration
Sold out
Swim venue
Bay
Average water temperature
19 °C
Bike profile
Flat
Bike elevation gain
154 m
Run profile
Flat
Run elevation gain
12 m
High air temperature
23 °C
Low air temperature
16 °C
Overall cut-off
8 h 30 min
Altitude
4 m
First edition
2011
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. An average of 19 °C sits in the range where a wetsuit is both allowed and worth wearing for nearly everyone.

The bike leg is labelled flat and runs over 1 loop.

The run is labelled flat, over 2 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.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    19 °C · median 21 °C

    The 30th coldest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    23 °C · median 25 °C

    The 43rd coolest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    154 m · median 569 m

    The 11th flattest of the 105 middle-distance races with a figure, across every circuit.

43

races of this distance pair a flat bike with a flat run, out of 159. 53 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 70.3 Western Australia 2026?
IRONMAN 70.3 Western Australia is held on 6 December 2026 in Busselton, Australia. The race is sold out.
Is a wetsuit allowed at IRONMAN 70.3 Western Australia?
Most likely. The average water temperature is 19 °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 Western Australia?
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 Western Australia?
The bike course climbs about 154 m, the 11th flattest of 105 half-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