Where was the first modern swim, bike, run event held?

Mission Bay, San Diego.

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  3. Mission Bay, San Diego ✔

Why: The first modern swim, bike, run event was held at Mission Bay, San Diego, in 1974.

Huh, didn't know that: The first modern swim, bike, run event was held at Mission Bay, San Diego, in 1974.

The dad joke
San Diego started the modern triathlon, so it is the original tri-town.
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References

Answer: Mission Bay, San Diego. The first modern swim, bike, run event was held at Mission Bay, San Diego, in 1974.

  1. Triathlon en.wikipedia.org/wiki/Triathlon
    The first modern swim/bike/run event was held at Mission Bay, San Diego, California
    Checked 2026-11-07.

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