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 ** Coming Soon **

July 1st, 2023

Virtual Walk/Run: 200 miles or 105 miles

Bike: 600 mile Challenge
Row/Paddle: 200 mile Challenge

Swim: 40 mile Challenge

A virtual tour of California


3mi, 6mi, 9mi, Half, Youth, Virtual

Saturday, Nov. 11th

Huddart Park, Woodside, CA

Tails & Trails!! Hike, jog or run through the magical forest and towering redwoods on the lush trails in Woodside at Huddart Park.



January 2023

VIRTUAL - 31 Day Streak Challenge

How many days can you STREAK together? Commit to exercise for 30 mins a day or 60 mins a day. Can you streak together ALL 31 days?


 Triathlon, Duathlon, Aquabike

October 2024

Capitola, CA

Due to storm damage to the Capitola Wharf the access to the beach area will be limited where we hold the race start. due to ongoing repairs. The event will return in 2024


5K, 10K, 10 Mile, Youth, Virtual

Sunday, Sept. 17th

Crissy Field, San Francisco

Run along the San Francisco Bay and soak in views of the Alcatraz and the Golden Gate. The Sirena10 Mile Run crosses the Golden Gate Bridge!

Opens 6/20

5K, 10K Half, Youth, Virtual

Sat. February 24th, 2024

San Diego, CA


The flat course is a mix of road and paved running path around Mission Bay. Soak in the views and the sun!



November 15th, 2022

46 Day Virtual Challenge

Every minute counts! The more minutes of exercise you log, the higher your ranking on the Leaderboard. Now you can yoga, walk, bike, row, swim, elliptical, hike and run to 2023.

Opens 6/2

 Virtual: Triathlon, Duathlon, Aquabike

October 2024


The Mermaid Virtual Tri & Du will be in place of our in-person Capitola Tri & Du.

Join us for a virtual challenge and complete a tri or du at your favorite location

Event Details

5K, 10K, Half, Youth, Virtual

Saturday, May 13th, 2023

Mare Island - Vallejo, CA

The NEW venue at Mare Island offers great views of the San Francisco Bay and a finish expo on the waterfront next to the Mare Island Brewing Company!


5K, 10K, 10 Mile, Youth, Virtual

Sat. May 18th, 2024

Spokane, WA


Head out from Riverfront Park and onto the Centennial Trail for a scenic run along the Spokane River. 

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