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Triathlon Atlas

Full distance · 16 May 2027

IRONMAN Jacksonville

Jacksonville, United States

The race at a glance

Official race website
Circuit
IRONMAN
Distance
Full distance
Terrain
Road
Swim
3.8 km
Bike
180 km
Run
42.2 km
Date
16 May 2027
Registration
Open
Swim venue
River
Average water temperature
26 °C
Bike profile
Flat
Bike elevation gain
225 m
Run profile
Rolling
Run elevation gain
92 m
High air temperature
33 °C
Low air temperature
18 °C
Overall cut-off
17 h
Entry fee, from
$890
Altitude
1 m
First edition
2026
Swim start
Rolling start

Edition history

202616 May 2026Held

How the day is laid out

The swim is held in a river. An average of 26 °C is warm. Wetsuit use is commonly restricted above this point, and the swim becomes a question of heat more than of cold.

The bike leg is labelled flat.

The run is labelled rolling.

A flat bike ahead of a rolling run is a common pairing. It rewards a steady bike and makes a bike ridden too hard show up on the run.

Expect air between 18 °C and 33 °C on race day. A spread of 15 degrees across the day matters as much as the peak, because what you wear at the swim exit is rarely what you want at the far end of the bike.

A swim with the tide, a bike course being redrawn

The 3.8 km swim in the St. Johns River is point to point, timed with the incoming tide so that the current carries athletes towards downtown. At the first edition, in 2026, ironman.com measured the river at 26 °C, with an air high of 31 °C. That is above the 24.5 °C limit for age-group wetsuits under IRONMAN rules.

The bike course changes for 2027: ironman.com announces a reimagined 180 km course, evolving from the two-loop course of 2026, not yet published. The run crosses downtown Jacksonville and is rated rolling.

Source: ironman.com, read on 26 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

    26 °C · median 22 °C

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

  • High air temperature

    33 °C · median 25 °C

    The 4th hottest of the 52 full-distance races with a figure, across every circuit.

  • Bike elevation gain

    225 m · median 1130 m

    The 4th flattest of the 43 full-distance races with a figure, across every circuit.

4

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

32

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

68

races are held in North America. 9 of them in the same month as this one.

Questions about this race

When is IRONMAN Jacksonville 2027?
IRONMAN Jacksonville is held on 16 May 2027 in Jacksonville, United States. Registration is open on the official race page.
Is a wetsuit allowed at IRONMAN Jacksonville?
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 Jacksonville?
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 Jacksonville?
The bike course climbs about 225 m, the 4th flattest of 43 full-distance races with a figure. The bike is labelled flat and the run rolling. Expect highs of about 33 °C on race day.
How much is the entry fee for IRONMAN Jacksonville?
Entries start at US$890 for an individual age-group entry, before service fees. Prices rise by tier as the race fills.

Where to stay

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

Suggested stay: 14 May 2027 to 17 May 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