Compiled and fact-checked by Tommo, Verus founder · Last verified August 2026 · Spot an error?
Triathlon · Full Distance (140.6)
IRONMAN Western Australia 2026
- Race day
- Sunday, 6 December 2026
- Location
- Busselton, Western Australia
- Distance
- 226 km total
3.8km swim 180km bike 42.2km run
IRONMAN Western Australia: 6 December 2026, Busselton. The flattest full-distance course in Australia — Geographe Bay swim, Tuart Forest bike, cut-offs and entry.
87 days to go
Key Race Metrics & Overview
- Date
- Sunday, 6 December 2026
- Venue
- Signal Park and the Busselton Foreshore, beside the Busselton Jetty
- Distance
- Full Distance (140.6) — 226km total
- Start Time
- A self-seeded rolling start around dawn. Exact 2026 times are confirmed in the Athlete Information Guide during race week.
- Draft-Legal Bike
- No — non-drafting
- Cut-Off
- Measured from your individual start: 2 hours 20 minutes for the swim, 10 hours 30 minutes for the bike (with staged intermediate cut-offs at 90km, 110km, 134km, 151km, 165km and the 180km dismount), and 17 hours overall, itself staged across the four run laps. The bike cut-off is half an hour more generous than most IRONMAN races.
Also this weekend
IRONMAN 70.3 Western Australia runs at the same venue, on a separate date, using the same jetty and foreshore.
Leg 1 of 3
Swim — 3.8km
Two laps in Geographe Bay from the Busselton Foreshore, kept close to shore to reduce exposure to wind and give more consistent conditions. Athletes exit the water after the first lap, run a short section of beach, and re-enter for the second.
- Venue
- Geographe Bay, Busselton Foreshore
- Elevation gain
- No official figure published — see notes above
- Surface
- Sheltered bay — calm, shallow, and one of the more forgiving full-distance swims anywhere.
Wetsuit: Decided against the measured water temperature on the day under the standard rules. Geographe Bay in early December averages around 21°C, comfortably inside wetsuit-legal territory in most years.
Leg 2 of 3
Bike — 180km
Two laps, and about as flat as a 180km gets. The course runs along the coast before turning inland into the Tuart Forest — one of the last remaining tall tuart forests in the world — with views of both coast and bushland, and enough wildlife on the roadside to be a distraction.
- Venue
- Busselton coast and the Tuart Forest
- Elevation gain
- No official figure published — see notes above
- Surface
- Sealed road — flat.
Non-drafting
Leg 3 of 3
Run — 42.2km
Four laps, relatively flat, heading east before turning back west to pass along the Busselton Jetty with views across Geographe Bay and the redeveloped foreshore. The lapped format keeps the crowd with you for the whole marathon.
- Venue
- Busselton Foreshore and the jetty
- Elevation gain
- No official figure published — see notes above
- Surface
- Sealed path — flat.
Wetsuit outlook
Will you need a wetsuit at IRONMAN Western Australia?
Water temperature at open sea in December has typically been 20.7°C, ranging from 19.5°C to 22°C in eight of every ten years. Against IRONMAN / 70.3's thresholds for this race's 3800m swim, that means:
Wetsuit optional — and recommended
Up to and including 24.5°C (76.1°F) every athlete may wear a wetsuit and remain eligible for awards.
What would have happened in each of the last 16 years
- Optional (recommended)16 of 16
What the organiser says
Decided against the measured water temperature on the day under the standard rules. Geographe Bay in early December averages around 21°C, comfortably inside wetsuit-legal territory in most years.
Calibrated against measured sea-surface data, to within about 1.4°C. The official temperature is taken an hour before the start, and only that reading decides the rule on the day.
Transitions
Everything sits in one precinct around Signal Park next to the Busselton Jetty — transition, registration and the finish line. The bike finishes at the Queen Street roundabout, where you dismount and wheel left into transition; the run exit is beside the swim entry.
IRONMAN Western Australia Split Calculator
IRONMAN Western Australia Split-Time Calculator
Enter your own swim, bike and run pace to project a real finish time.
Projected Finish Time
11:12:06
Racing a different distance? Try the generic split calculator or the swim pace calculator.
Where IRONMAN Western Australia starts and finishes
These are the start and finish points, not the route. Verus doesn't hold course files for this race, and drawing a line between two pins would be a guess you might end up training on. The official course map is the one to use: view it on the organiser's site .
What you can qualify for
IRONMAN Western Australia is the Asia-Pacific Championship, which means a larger allocation of age-group qualifying slots for the IRONMAN World Championship than a standard full-distance race. Combined with the flat course, it is the Australian race most often targeted for qualification.
Entry & Ballot
Direct entry summary
General registration for 2026 has sold out. IRONMAN normally opens the following year shortly after race day, and this one goes early — a flat course with an Asia-Pacific Championship slot allocation is a combination that fills.
Ballot policy
No ballot — entry is direct and first come, first served, and it sells out.
Age requirement
Not published for this event — check the official race website.
Charity Places
Not published for this event — check the official race website.
Race Day Info & Checklist
On the day
- The Asia-Pacific Championship, and the flattest and fastest full-distance course in Australia.
- A rolling swim start, self-seeded by estimated swim time.
- The two-lap swim includes an Australian exit — a short beach run between laps.
- The bike cut-off is 10 hours 30 minutes rather than the usual 10, which along with the flat profile makes this an unusually forgiving first IRONMAN.
- The whole precinct sits around Signal Park by the Busselton Jetty; transition, registration and the finish are within a few hundred metres of each other.
- On-course fuel, per the official 2024 Athlete Information Guide, is PURE Sports Nutrition Electrolyte (Superfruits) and Maurten Energy Gels/Bars — plus Vaseline, sunscreen and insect repellent at every aid station.
- IRONMAN has been racing here for over twenty years.
- Timing chip is on loan, collected at bike racking — a lost chip costs an A$150 replacement fee. Race kit includes a $35 restaurant voucher usable at participating Busselton restaurants.
Checklist
- A pacing plan that respects how flat this is — the temptation to ride too hard on a course with no hills to slow you is the classic mistake here
- Blue and Red Gear Bags packed to the published transition process
- Sun protection for a December day in Western Australia, where the UV is among the highest in the country
- A wetsuit, which at around 21°C average water is very likely legal
- Accommodation booked early — Busselton is a small town and race week fills it
- A plan for the Fremantle Doctor if it arrives; the coastal section of the bike is exposed
Transport, Spectating & Where to Stay
Transport
No rail to Busselton. Busselton Margaret River Airport takes direct flights from Melbourne and Sydney seasonally; otherwise it is about two and a half hours by road from Perth.
Not published for this event — check the official race website.
Closures along the foreshore, Queen Street and the bike course through the Tuart Forest. The event publishes a traffic impact page.
Spectator guide
The Busselton Foreshore covers the swim, both transitions, the run and the finish from essentially one spot — this is one of the best full-distance races in the world to spectate.
You barely need to. The four-lap run passes the foreshore repeatedly, and the jetty gives a view over the whole swim.
Where to stay
Busselton foreshore
+ Walk to everything. On a day that starts before dawn and ends at midnight, this is worth more than the price difference.
– Small town, limited stock, books out a year ahead.
Dunsborough
+ Twenty-five minutes away, more to do, and the gateway to the Margaret River region if you are making a holiday of it.
– A drive on race morning, and back again at the end of a very long day.
Margaret River
+ The best base for a week either side, with the Cape to Cape Track and the wine region on the doorstep.
– An hour from the start line.
Frequently Asked Questions
When is IRONMAN Western Australia?
Sunday 6 December 2026, at Busselton in Western Australia. It is the Asia-Pacific Championship.
Is IRONMAN Western Australia the flattest IRONMAN in Australia?
Yes. Both the 180km bike through the Tuart Forest and the four-lap foreshore run are flat, and the swim in Geographe Bay is sheltered and shallow. It is the Australian race most often chosen for a fast time or a World Championship slot.
What are the IRONMAN Western Australia cut-offs?
From your individual start: 2 hours 20 minutes for the swim, 10 hours 30 minutes for the bike and 17 hours overall. The bike cut-off is half an hour more generous than most IRONMAN races.
Does the IRONMAN Western Australia swim have an Australian exit?
Yes. The two-lap course has athletes leave the water after the first lap, run a short beach section, and re-enter for the second.
Does IRONMAN Western Australia sell out?
Yes — general registration for 2026 sold out. A flat course with an Asia-Pacific Championship slot allocation fills early.
Where is Busselton and how do you get there?
About two and a half hours south of Perth by road, at the northern edge of the Margaret River region. Busselton Margaret River Airport takes seasonal direct flights from Melbourne and Sydney.