IRONMAN Portugal-Cascais
Course breakdown, historical weather, and field analysis.
Rolling roads through Cascais
Cascais, Portugal · October 18, 2026
IRONMAN Portugal-Cascais takes place in Cascais, Portugal on October 18, 2026. The full-distance course covers a 3.82 km swim, 180.1 km bike with 1268m of climbing, and a 42.3 km run.
- Swim
- 3.8 km
- Ocean_sheltered
- Bike
- 180.1 km
- ↑1556m · Rolling
- Run
- 42.3 km
- ↑189m · Flat
- Air Temp
- 15–25°C
- Water Temp
- 18°C
- Wind
- 11 km/h
- SW
Swim Course
Ocean_sheltered swim — 3.82 km
Athletes face a 3.82 km swim in ocean_sheltered conditions. Wetsuits are permitted and recommended at this water temperature.
- Ocean_sheltered swim
- 18°C average water temperature
- 4 sharp turns
Bike Course
1268m of climbing over 180.1 km
The bike course covers 180.1 km across rolling terrain with 1268m of total climbing. Watch for 11 U-turns that break rhythm and require careful braking.
- 1268m total elevation gain
- 7.0 m/km average gradient
- 26 categorised climbs
- 11 U-turns
- 257 sharp turns
- Rolling terrain profile
Run Course
A fast, flat 42.3 km run
The run covers 42.3 km with 189m of climbing. With 7 U-turns, maintaining rhythm through the turnarounds is key.
- 189m total elevation gain
- 4.5 m/km average gradient
- 10 categorised climbs
- 7 U-turns
- 84 sharp turns
- Flat terrain profile
Race Day Conditions
Warm conditions on race day
Based on historical averages, expect temperatures around 21°C on race day. Winds average 11 km/h.
Race Field Insights
How the Field Performs
Aggregated from 6,414 finishers (2021–2025)
- Total Starters
- 7,157
- Finishers
- 6,414
- DNF Rate
- 9.3%
- Years of Data
- 2021–2025
- Median Finish
- 12h 05m
Finish Time Distribution
How the Median Finisher Spends Race Day
What Each Pace Looks Like
Fast | Solid | Median | Back of Pack | Slow (P90) | |
|---|---|---|---|---|---|
| Swim | 1h 02m | 1h 08m | 1h 16m | 1h 25m | 1h 34m |
| Bike | 5h 14m | 5h 38m | 6h 08m | 6h 43m | 7h 16m |
| Run | 3h 25m | 3h 47m | 4h 18m | 4h 55m | 5h 31m |
| Finish | 10h 03m | 10h 56m | 12h 05m | 13h 25m | 14h 30m |
Plan IRONMAN Portugal-Cascais 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.