Ironman 70.3 Oceanside

MAR

28

2026

Experience a unique triathlon featuring a harbor swim, a bike course through the Camp Pendleton military base, and a scenic run along the Pacific Ocean. This Southern California event concludes with a festive finish on the beach.

Sat 28 Mar 2026

Oceanside, California

Website Registration

70.3

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IRONMAN 70.3 Oceanside

IRONMAN 70.3 Oceanside is an endurance sports event held in California. The competition consists of three primary segments that take place across the city's harbor, local military grounds, and the beachfront.

The event features the following distances:

IRONMAN 70.3 (1.9 km swim, 90 km bike, 21.1 km run)

The swim course takes place in the sheltered Oceanside harbor, which provides protection from ocean waves. The water temperature typically averages around 57 °F (14 °C). Participants transition to a hilly bike course that includes a unique section through the Camp Pendleton active military base. The run course is a rolling route along the Pacific Ocean, utilizing beachfront trails and finishing on The Strand.

The event location offers a downtown area where athletes can walk between hotels, the venue, and the beach. Typical air temperatures for the region during this period range from a low of 47 °F (8 °C) to a high of 66 °F (19 °C). This race serves as a qualifying event for the IRONMAN 70.3 World Championship and is part of the IRONMAN Pro Series. An IRONKIDS event is also organized in conjunction with the main race. Visit the organization's website for the most recent information.

70.3