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Triathlon Atlas

Half distance · 3 April 2027

IRONMAN 70.3 Oceanside

Oceanside, United States

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
3 Apr 2027
Registration
Sold out
Swim venue
Bay
Average water temperature
16 °C
Bike profile
Hilly
Bike elevation gain
829 m
Run profile
Rolling
Run elevation gain
84 m
High air temperature
21 °C
Low air temperature
7 °C
Overall cut-off
8 h 30 min
Entry fee, from
$620
Altitude
20 m
First edition
2000
Swim start
Rolling start

Edition history

202628 Mar 2026Held
20255 Apr 2025Held
20246 Apr 2024Held
20231 Apr 2023Held
20222 Apr 2022Held
202130 Oct 2021Held
20196 Apr 2019Held
20187 Apr 2018Held
20171 Apr 2017Held
20162 Apr 2016Held

How the day is laid out

The swim is held in a bay, from a rolling start. At an average of 16 °C this is cold water. A wetsuit will be worn by almost everyone who is allowed one, and a swim shortened or cancelled for conditions is a real possibility at this end of the range.

The bike leg is labelled hilly.

The run is labelled rolling.

A hilly bike ahead of a rolling run puts the day's decision early: what you spend on the climbs is what the run will not have.

Expect air between 7 °C and 21 °C on race day. A spread of 14 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.

Cold harbour water

ironman.com publishes the harbour water measured on race day: 15 °C (59 °F) in 2024, 14 °C (57 °F) in 2025 and 18 °C (64 °F) in 2026. Below 16 °C, the IRONMAN Competition Rules make the wetsuit compulsory. Morning lows were 6 to 8 °C over the same three years.

For 2026 the organiser announced a swim entirely inside the harbour, sheltered from the ocean waves, from a rolling start. The bike crosses Camp Pendleton, an active Marine Corps base.

Source: ironman.com, read on 21 October 2026. The IRONMAN in the USA page compares it with the other US races.

Against the calendar

Where this race sits among the others

Ranks are computed across every race of the same distance.

  • Average water temperature

    16 °C · median 21 °C

    The 2nd coldest of the 128 middle-distance races with a figure, across every circuit.

  • High air temperature

    21 °C · median 25 °C

    The 21st coolest of the 152 middle-distance races with a figure, across every circuit.

  • Bike elevation gain

    829 m · median 569 m

    The 31st 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.

36

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

68

races are held in North America. 8 of them in the same month as this one.

Questions about this race

When is IRONMAN 70.3 Oceanside 2027?
IRONMAN 70.3 Oceanside is held on 3 April 2027 in Oceanside, United States. The race is sold out.
Is a wetsuit allowed at IRONMAN 70.3 Oceanside?
Most likely. The average water temperature is 16 °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 Oceanside?
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 Oceanside?
The bike course climbs about 829 m, the 31st hilliest of 105 half-distance races with a figure. The bike is labelled hilly and the run rolling. Expect highs of about 21 °C on race day.
How much is the entry fee for IRONMAN 70.3 Oceanside?
Entries start at US$620 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: 1 Apr 2027 to 4 Apr 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