IRONMAN 70.3 Oceanside 2027
The American season opener. A sheltered harbour swim, a rolling ride through Camp Pendleton, and a two-lap coastal run finishing at Oceanside Pier.
33 weeks to race day: base season
Plenty of runway. This far out, the win is a boring, consistent base rhythm: aerobic volume, strength, technique. The structured block starts closer in; what you do now decides how high it can climb.
Building for this one? 70.3 training plan covers the sessions, the weekly shape and how the block is paced. The R.A.C.E. Framework explains why it is built that way.
Start my Road to IRONMAN 70.3 Oceanside.
Commit to the date and the work gets a shape: your countdown starts, the emails arrive in step with your build, and the app anchors a recovery-led block so the final week lands exactly on race day.
One confirmation email, then the road begins. Registering for the race itself stays with the organiser.
“The traditional season opener, and it is cold. Sixteen degree water in April off a winter of indoor training is a shock unless you have been in open water in March.”
The race
The course
No course maps for this race. IRONMAN publishes no downloadable route for any leg of this race, only a live tracker that runs on race day, so there is nothing to draw a course map from. Everything below comes from the official course page, checked on the date at the foot of this section.
Entirely inside the harbour and sheltered from the ocean swell, one counterclockwise loop from a rolling start. Cold, though: around 16°C in early April is the coldest swim of the American season.
Out of the harbour and onto Camp Pendleton, an active Marine Corps base closed to the public for the rest of the year. Rolling rather than flat, and the one day you get to ride it.
Two loops from the harbour out along The Strand and through the coastal neighbourhoods, finishing at Oceanside Pier. Flat and fast in general, with sharp short climbs and descents each time the course changes from beach level to street level.
Not yet confirmed for this edition: bike lap count, bike elevation gain, transition locations, cut-off times, water temperature history. We publish these only once they are on the official course page, so check there before you pace off anything here.
Course details verified against the official IRONMAN 70.3 Oceanside course page on 14 August 2026. Courses change; the official page is always the last word.
Questions, answered
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What distances can I race at IRONMAN 70.3 Oceanside?
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What is the swim like?
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Read before you race
Race Week Is Where People Unravel.
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Photograph of Oceanside, California, USA: User Bill Newman, Public domain, via Wikimedia Commons. Not official race photography.
This listing is for information only. Unbroken is not affiliated with, endorsed by, or sponsored by IRONMAN 70.3 Oceanside or its organiser. Details are based on publicly available information; names are used descriptively to identify the event. For accurate, up-to-date information and to enter, always use the official event website.