IRONMAN 70.3 Western Australia
Course breakdown, historical weather, field analysis, and pacing notes.
A fast, flat course in Busselton
Busselton, Australia · December 6, 2026
IRONMAN 70.3 Western Australia takes place in Busselton, Australia on December 6, 2026. The half-distance course covers a 1.90 km swim, 90.3 km bike with 45m of climbing, and a 21.4 km run.
- Swim
- 1.9 km
- Ocean_sheltered
- Bike
- 90.3 km
- ↑90m · Flat
- Run
- 21.4 km
- Flat
- Air Temp
- 10–26°C
- Water Temp
- 20°C
- Wind
- 19 km/h
- S
Swim Course
Ocean_sheltered swim — 1.90 km
Athletes face a 1.90 km swim in ocean_sheltered conditions. Wetsuits are permitted and recommended at this water temperature.
- Ocean_sheltered swim
- 20°C average water temperature
- 4 sharp turns
Bike Course
A fast, flat 90.3 km ride
The bike course covers 90.3 km across flat terrain with 45m of total climbing. Watch for 5 U-turns that break rhythm and require careful braking.
- 45m total elevation gain
- 0.5 m/km average gradient
- 5 U-turns
- 62 sharp turns
- Flat terrain profile
Run Course
Fast, flat 3-lap run course
The run covers 21.4 km. Athletes complete 3 laps, so crowd support and mental pacing strategies play a big role.
- 0.0 m/km average gradient
- 6 U-turns
- 44 sharp turns
- 3 laps
- Flat terrain profile
Race Day Conditions
Warm conditions on race day
Based on historical averages, expect temperatures around 20°C on race day. Winds average 19 km/h.
Race Field Insights
How the Field Performs
Aggregated from 4,928 finishers (2021–2025)
- Total Starters
- 5,076
- Finishers
- 4,928
- DNF Rate
- 2.9%
- Years of Data
- 2021–2025
- Median Finish
- 5h 48m
Finish Time Distribution
How the Median Finisher Spends Race Day
What Each Pace Looks Like
Fast | Solid | Median | Back of Pack | Slow (P90) | |
|---|---|---|---|---|---|
| Swim | 31m 52s | 35m 11s | 39m 33s | 44m 41s | 50m 40s |
| Bike | 2h 27m | 2h 38m | 2h 52m | 3h 08m | 3h 24m |
| Run | 1h 38m | 1h 49m | 2h 04m | 2h 22m | 2h 41m |
| Finish | 4h 52m | 5h 17m | 5h 48m | 6h 27m | 7h 02m |
Plan IRONMAN 70.3 Western Australia with Keiro
Get a complete pacing strategy for every discipline — built from this course, forecast weather, and your fitness.
Independent analysis. KeiroLabs is not the event organizer and is not affiliated with the race organizer.