IRONMAN 70.3 Belgrade
Course breakdown, historical weather, and field analysis.
A fast, flat course in Belgrade
Belgrade, Serbia · September 13, 2026
IRONMAN 70.3 Belgrade takes place in Belgrade, Serbia on September 13, 2026. The half-distance course covers a 1.90 km swim, 90.2 km bike with 133m of climbing, and a 21.0 km run.
- Swim
- 1.9 km
- Lake
- Bike
- 90.2 km
- ↑296m · Flat
- Run
- 21.0 km
- ↑93m · Flat
- Air Temp
- 9–31°C
- Water Temp
- 23°C
- Wind
- 14 km/h
- W
Swim Course
Lake swim — 1.90 km
Athletes face a 1.90 km swim in lake conditions. Wetsuits are permitted but not required at this temperature — a borderline call for most athletes.
- Lake swim
- 23°C average water temperature
- 2 sharp turns
Bike Course
A fast, flat 90.2 km ride
The bike course covers 90.2 km across flat terrain with 133m of total climbing.
- 133m total elevation gain
- 1.5 m/km average gradient
- 2 U-turns
- 34 sharp turns
- Flat terrain profile
Run Course
A fast, flat 21.0 km run
The run covers 21.0 km with 92m of climbing. With 7 U-turns, maintaining rhythm through the turnarounds is key.
- 92m total elevation gain
- 4.4 m/km average gradient
- 7 U-turns
- 78 sharp turns
- Flat terrain profile
Race Day Conditions
Warm conditions on race day
Based on historical averages, expect temperatures around 22°C on race day. Winds average 14 km/h.
Race Field Insights
How the Field Performs
Aggregated from 1,047 finishers (2024–2025)
- Total Starters
- 1,226
- Finishers
- 1,047
- DNF Rate
- 14.2%
- Years of Data
- 2024–2025
- Median Finish
- 5h 47m
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 24s | 35m 06s | 39m 44s | 44m 06s | 48m 56s |
| Bike | 2h 24m | 2h 38m | 2h 54m | 3h 12m | 3h 30m |
| Run | 1h 35m | 1h 44m | 1h 57m | 2h 13m | 2h 29m |
| Finish | 4h 42m | 5h 13m | 5h 47m | 6h 24m | 7h 00m |
Plan IRONMAN 70.3 Belgrade 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.