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Triathlon Atlas

Half distance · 23 October 2027

IRONMAN 70.3 Portugal-Cascais

Cascais, Portugal

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Middle distance
Terrain
Road
Swim
1.9 km
Bike
90 km
Run
21.1 km
Date
23 Oct 2027
Registration
Sold out
Swim venue
Bay
Average water temperature
17 °C
Bike profile
Hilly
Bike elevation gain
771 m
Run profile
Rolling
Run elevation gain
127 m
High air temperature
25 °C
Low air temperature
18 °C
Overall cut-off
8 h 30 min
Altitude
8 m
First edition
2017
Swim start
Rolling start

Edition history

202617 Oct 2026Held
202518 Oct 2025Held
202419 Oct 2024Held
202321 Oct 2023Held
202215 Oct 2022Held
202124 Oct 2021Held
201929 Sept 2019Held
201830 Sept 2018Held
20173 Sept 2017Held

How the day is laid out

The swim is held in a bay. The wetsuit call is made on race morning, against the temperature measured then.

The organiser publishes 1.9 km of swimming, 90 km on the bike and 21.1 km of running.

The swim uses a rolling start: athletes enter the water a few at a time. The water is usually around 17 °C at this time of year.

The bike course is hilly, with about 771 m of climbing.

The run course is rolling, with about 127 m of climbing.

Typical temperatures for the month run from 18 to 25 °C. The overall cut-off is 8 h 30 min.

The race was first held in 2017.

The same bay as the full distance, on the same day

The 1.9 km swim is one loop from Ribeira beach around the bay to the fortress at the Clube Naval, in the water used that day by the IRONMAN Portugal-Cascais. The organiser gives 17 to 19 °C in October; the course page lists 17 °C measured in 2023 and 18 °C in 2024 and 2025, below the 24.5 °C up to which IRONMAN allows wetsuits for age-group athletes.

T1 is on the Citadel platform, and the same area serves as T2. The bike is a single loop past Guincho beach, Malveira and the Serra de Sintra, towards the Estoril circuit. The run makes two loops from Cascais to Cabo Raso along the Guincho road, which the organiser calls challenging on a windy day.

Source: ironman.com, read on 19 October 2026.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    17 °C · median 21 °C

    The 8th coldest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    25 °C · median 25 °C

    The 71st coolest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    771 m · median 569 m

    The 38th hilliest of the 105 middle-distance races with a figure, across every circuit.

13

races of this distance pair a hilly bike with a rolling run, out of 159. 29 share the bike profile alone.

32

races across every distance fall in October, out of 354.

160

races are held in Europe. 14 of them in the same month as this one.

Questions about this race

When is IRONMAN 70.3 Portugal-Cascais 2027?
IRONMAN 70.3 Portugal-Cascais is held on 23 October 2027 in Cascais, Portugal. The race is sold out.
Is a wetsuit allowed at IRONMAN 70.3 Portugal-Cascais?
Most likely. The average water temperature is 17 °C, below the 24.5 °C limit up to which wetsuits are allowed for age-group athletes. The official call is made on race morning.
What is the cut-off at IRONMAN 70.3 Portugal-Cascais?
The course closes 8 h 30 min after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN 70.3 Portugal-Cascais?
The bike course climbs about 771 m, the 38th hilliest of 105 half-distance races with a figure. The bike is labelled hilly and the run rolling. Expect highs of about 25 °C on race day.

Where to stay

Hotels and rentals around the race venue, for the nights around race day.

Suggested stay: 21 Oct 2027 to 24 Oct 2027

The map is provided by Stay22. Bookings are made with the provider.

Races of the same distance in the same region

Entries are handled by the organiser

Registration and the athlete guide are on the official race page.

Open the official race page