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Tickets $105–$275

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Come down to the bay and see why this triathlon is now in its 12th year. Great for all levels of athlete, not only do all the net proceeds go to charity, but the course features a beautiful route along the bayside. Come along for the finisher’s medal and amazing views of the San Francisco Bay.

How to enter the Marin County Triathlon & Duathlon

  1. Triathlon- Sprint

    Triathlon: Swim 0.5km, Bike 12.87km, Run 5km
    Standard Entries
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  2. Duathlon - Sprint

    Duathlon: Run 1.6km, Bike 12.87km, Run 5km
    Standard Entries
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  3. Triathlon - Olympic

    Triathlon: Swim 1.5km, Bike 35.4km, Run 10km
    Standard Entries
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  4. Duathlon - Olympic

    Duathlon: Run 5km, Bike 35.4km, Run 10km
    Standard Entries
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Marin County Triathlon & Duathlon training plans

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Marin County Triathlon & Duathlon routes

The 0.5k bay swim will be on the north side of the pier where Sunday’s Olympic distance swim finish area is.

The 12.87k bike course is one loop and the 5k run is one loop of Sunday’s Olympic distance course.

Event Details


Where should racers be from 7:45 am until the start of the race?

All racers should wait at the Swim Start for race instructions.

Which direction does the bike race follow?

After the swimmers leave the water and enter the transition area, bikers will travel through the VIP Parking lot, up the hill (Cantera Way) to Point San Pedro Road, turn right at the top of the hill, follow the road until the turn around point (Back Ranch Meadows Campground Entrance), return on the same road, pass the entrance to McNear’s Beach, and follow Point San Pedro Road until the turn around point (at the quarry).

Are there any Transition Area rules?

Yes. To enter the Transition Area in the morning, you will first need to be body marked as well as have your bike number attached to your bike. After the event, to retrieve your bike, you will need to show your bib number to the volunteer & to match it to the number on your bike to exit the Transition Area.

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Marin County Triathlon & Duathlon weather forecast

Partly cloudy throughout the day.

Predicted highs
Predicted lows
IconLight breeze possible, up to 7mph

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