IRONMAN 70.3 Tallinn
Course breakdown, historical weather, and field analysis.
Half-distance in the Baltic medieval capital
Tallinn, Estonia · August 23, 2026
IRONMAN 70.3 Tallinn offers the Estonian racing experience at half distance. A Baltic Sea swim, a flat bike through the countryside, and a run through Tallinn's remarkable old town. All the charm of the full-distance event in a more accessible format.
- Swim
- 1.9 km
- Ocean
- Bike
- 91.6 km
- ↑271m · Flat
- Run
- 21.6 km
- ↑43m · Flat
- Air Temp
- 10–29°C
- Water Temp
- 18°C
- Wind
- 15 km/h
- S
Swim Course
Baltic Sea swim near Tallinn
The swim takes place in the Baltic Sea near Tallinn. Calm, low-salinity water with temperatures around 18–21°C in late August.
- Calm Baltic Sea conditions
- Low salinity — almost freshwater
- Comfortable late-August temperatures
- Estonian coastline setting
Bike Course
Flat Estonian roads at half distance
The 90 km bike course covers the flat Estonian countryside. Minimal climbing and open roads make this a fast, wind-dependent course. The flat terrain suits time trialists and steady-state riders.
- Flat terrain — minimal climbing
- Wind is the primary variable
- Fast course potential
- Open Estonian countryside
Run Course
Half marathon through Tallinn's old town
The run takes athletes through Tallinn's streets including the medieval old town. The UNESCO-listed architecture provides a unique backdrop for a half marathon.
- UNESCO World Heritage old town
- Unique medieval running backdrop
- Flat to gently undulating
- Estonian community support
Race Day Conditions
Late Baltic summer — mild and pleasant
Late August in Tallinn offers mild conditions with temperatures ranging from 14–22°C. Comfortable for racing with the possibility of rain.
Race Field Insights
How the Field Performs
Aggregated from 5,152 finishers (2021–2025)
- Total Starters
- 5,375
- Finishers
- 5,152
- DNF Rate
- 2.8%
- Years of Data
- 2021–2025
- Median Finish
- 5h 42m
Finish Time Distribution
How the Median Finisher Spends Race Day
What Each Pace Looks Like
Fast | Solid | Median | Back of Pack | Slow (P90) | |
|---|---|---|---|---|---|
| Swim | 32m 07s | 35m 45s | 39m 49s | 44m 45s | 49m 51s |
| Bike | 2h 24m | 2h 36m | 2h 50m | 3h 07m | 3h 24m |
| Run | 1h 35m | 1h 46m | 2h 00m | 2h 17m | 2h 35m |
| Finish | 4h 42m | 5h 09m | 5h 42m | 6h 17m | 6h 55m |
Related reading
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Independent analysis. KeiroLabs is not the event organizer and is not affiliated with the race organizer.