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Triathlon Atlas

Full distance · 12 September 2027

IRONMAN Japan South Hokkaido

Hokuto, Japan

The race at a glance

Official race website Registration page
Circuit
IRONMAN
Organiser
IRONMAN
Distance
Full distance
Terrain
Road
Swim
3.8 km
Bike
180 km
Run
42.2 km
Date
12 Sept 2027
Registration
Opening soon
Swim venue
Ocean
Average water temperature
21 °C
Bike profile
Flat
Run profile
Flat
High air temperature
27 °C
Low air temperature
16 °C
Overall cut-off
17 h
Altitude
3 m
First edition
2024
Swim start
Rolling start

Edition history

202613 Sept 2026Held
202514 Sept 2025Held
202415 Sept 2024Held

How the day is laid out

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

The organiser publishes 3.8 km of swimming, 180 km on the bike and 42.2 km of running.

The swim uses a rolling start: athletes enter the water a few at a time. The water is usually around 21 °C at this time of year.

The bike course is flat.

The run course is flat.

Typical temperatures for the month run from 16 to 27 °C. The overall cut-off is 17 hours.

The race was first held in 2024.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    21 °C · median 22 °C

    The 16th coldest of the 48 full-distance races with a figure, across every circuit.

  • High air temperature

    27 °C · median 25 °C

    The 19th hottest of the 52 full-distance races with a figure, across every circuit.

13

races of this distance pair a flat bike with a flat run, out of 55. 19 share the bike profile alone.

45

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

37

races are held in Asia. 1 of them in the same month as this one.

Questions about this race

When is IRONMAN Japan South Hokkaido 2027?
IRONMAN Japan South Hokkaido is held on 12 September 2027 in Hokuto, Japan. Registration has not opened yet.
Is a wetsuit allowed at IRONMAN Japan South Hokkaido?
Most likely. The average water temperature is 21 °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 Japan South Hokkaido?
The course closes 17 h after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.

Where to stay

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

Suggested stay: 10 Sept 2027 to 13 Sept 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 pageRegister