Compete in IRONMAN 70.3 Oceanside featuring a stunning Pacific Ocean swim, a fast bike along California’s coastline, and a scenic run through beachfront trails. The course includes a 1.2-mile harbor swim, a 56-mile bike ride through an active military base, and a 13.1-mile run along the coast, ending at the famously festive finish line at the Oceanside Pier on The Strand.
Athletes can experience unique opportunities come race day, from swimming in the sheltered Oceanside Harbor to biking through Camp Pendleton. Historical race weather features average air temperatures ranging from 45°F to 73°F and water temperatures between 57°F and 64°F.
Registration offers include Flex90 early entry benefits (available for registrations on or before November 4, 2026), which allow fee-free transfers or partial refunds if plans change. Entry tiers also include Bundle Options (Signature Finish, Peace of Mind), NIRVANA Experience Packs, and charity entries through the IRONMAN Foundation Community Fund and Challenged Athletes Foundation (CAF).
The course consists of a 1.2-mile single-loop swim in Oceanside Harbor sheltered from waves, a 56-mile bike course through Camp Pendleton active military base, and a two-loop 13.1-mile run from transition in Oceanside Harbor along The Strand and coastal neighborhoods, finishing at the Oceanside Pier. The run is flat and fast with turns and elevation shifts between beach and street level.
The swim course takes place entirely in Oceanside Harbor, sheltered from ocean waves. The swim features a rolling start where athletes swim a single loop counterclockwise around buoys before exiting to transition.
The bike course takes athletes from Oceanside Harbor through Camp Pendleton, an active military base, offering views of Southern California's coastline and landscape.
The two-loop, 13.1-mile run course starts at transition in Oceanside Harbor, routing down The Strand and through coastal neighborhoods before finishing at the Oceanside Pier. The run is flat and fast with climbs and descents transitioning between beach level and street level.
Log into your IRONMAN Profile and navigate to the Registrations page. Hover over the event, click on Race Details, and click 'Tell Us Your Story' to share your background for a chance to be featured.
Yes. A two-person relay can complete the race with any combination of disciplines. Relay teams may later add a third person if they wish.
No. Only the run leg relay participant can cross the finish line. Per Competition Rules, if other team members cross with the runner, the team will be disqualified.
No. Team members are only allowed to compete on one relay team.
All relay team members must have a photo I.D. If not yet registered, you will need to do so at the Solutions table within athlete check-in. Bring a credit card to make the USAT one-day license payment if not already a member.
Yes. All teams MUST arrive together for Athlete Check-In to ensure all materials are accounted for and individual waivers are signed.
No. The relay team will receive one timing chip at bike check-in which acts as a baton handed off between team members in transition.
No. Relay team members can be a mix of gender and age. All participants must be at least 18 years of age on race day.