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Triathlon Atlas

Full distance · 9 October 2027

IRONMAN World Championship

Kona, United States

The race at a glance

Official race website
Circuit
IRONMAN
Status
World championship
Distance
Full distance
Terrain
Road
Swim
3.8 km
Bike
180 km
Run
42.2 km
Date
9 Oct 2027
Registration
Qualification only
Swim venue
Ocean
Average water temperature
26 °C
Bike profile
Rolling
Bike elevation gain
1,772 m
Run profile
Rolling
Run elevation gain
307 m
High air temperature
31 °C
Low air temperature
24 °C
Overall cut-off
17 h
Altitude
2 m
First edition
1978
Swim start
Wave start

Edition history

202610 Oct 2026Held

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 starts in waves. The water is usually around 26 °C at this time of year.

The bike course is rolling, with about 1,772 m of climbing.

The run course is rolling, with about 307 m of climbing.

Typical temperatures for the month run from 24 to 31 °C. The overall cut-off is 17 hours.

The race was first held in 1978.

Entry by qualification only

There is no open registration. ironman.com states that a place is earned by finishing among the fastest of one's age group at any IRONMAN race worldwide, and that the slot must be accepted in person at the post-race awards and rolldown ceremony. The 2027 race is on 9 October.

The swim starts in the water in Kailua Bay and goes out and back, clockwise. The bike crosses the volcanic landscapes of the Queen Kaʻahumanu Highway and the run finishes on Aliʻi Drive. The course page gives no water reading for 2024 to 2026; race-day air lows were 22 to 27 °C over those years.

Source: ironman.com, read on 3 November 2026.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    26 °C · median 22 °C

    The 6th warmest of the 48 full-distance races with a figure, across every circuit.

  • High air temperature

    31 °C · median 25 °C

    The 6th hottest of the 52 full-distance races with a figure, across every circuit.

  • Bike elevation gain

    1772 m · median 1130 m

    The 11th hilliest of the 43 full-distance races with a figure, across every circuit.

6

races of this distance pair a rolling bike with a rolling run, out of 55. 20 share the bike profile alone.

32

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

68

races are held in North America. 4 of them in the same month as this one.

Questions about this race

When is IRONMAN World Championship Kona 2027?
IRONMAN World Championship Kona is held on 9 October 2027 in Kona, United States. Entry is by qualification only.
Is a wetsuit allowed at IRONMAN World Championship Kona?
Yes, but without awards. The average water temperature is 26 °C: between 24.6 °C and 28.8 °C a wetsuit may be worn, but without eligibility for age-group awards or slots. The official call is made on race morning.
What is the cut-off at IRONMAN World Championship Kona?
The course closes 17 h after the start. Intermediate cut-offs after the swim and the bike are in the athlete guide.
How hard is IRONMAN World Championship Kona?
The bike course climbs about 1772 m, the 11th hilliest of 43 full-distance races with a figure. The bike is labelled rolling and the run rolling. Expect highs of about 31 °C on race day.

Where to stay

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

Suggested stay: 7 Oct 2027 to 10 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