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Saturday, May 11th, 2024

Race information
Be advised that HWY 37 EASTBOUND is closed from Friday, May 10th to Monday, May 13th. Detours are in effect. Please plan accordingly. Westbound traffic will remain open. Full details are on Caltrans Website.


All levels of walkers, joggers and runners welcome!! The new venue highlights running along the Mare Island waterfront and the historic shipyard. The 5K and 10K are entirely on the road. The Half Marathon includes several miles of groomed dirt trails. The 10K and the Half both have one climb that takes you up to the top of the Mare Island Preserve. Mermaids receive a stylish race shirt, finisher medal, necklace and post race food.



Half - 7:30 a.m.
10K - 8:30 a.m. 
5K - 9:00 a.m.
mermaid dash (ages 6-12) - 10:00 a.m.



Race Updates are sent out one to two weeks in advance

Race Update #1

Race Update #2


The Mermaid Dash is a 1.5 mile dash for girls & boys ages 6 to 12.

Dashers receive a medal, necklace and post race food. Parents are
welcome to run with the dashers. 
$15.00 online and $20.00 race day.

Entry fee does not include a race shirt



5K - [Interactive Map]  [Map]  [pdf]

10K - [Interactive Map]  [Map]  [pdf]
 - [
Interactive Map]  [Map]  

Entry fees

Entry fees are listed on the Registration page.

We offer FUTURE RACE CREDITS (credits for the following year or a different event) for those who volunteer a shift at any of our events. Volunteer shifts include registration, course monitors, water stations, set up and clean up. To find out more about our volunteer opportunities please email:

Youth receive 20% off the current registration price.

Mermaid Youth 1.5 Mile Dash is $15.00 online or $20.00 at the event. Dash entry does NOT include a shirt, but does include a medal and necklace.



We are happy to issue you a credit toward a future Mermaid Series event. To receive a credit, please email us at a minimum of 10 days before the event date. We will email you back a confirmation along with the amount of your future race credit. Please keep the confirmation email for your records.


Our event credit and event cancellation policy is outlined on the event "Participant Waiver" which is agreed upon when you registered:

Mermaid Series (pdf) Wavier


The following credits will be issued: 

• Run - Entry fee minus $10 processing fee
• Duathlon - Entry fee minus $10 processing fee
• Triathlons - Entry fee minus $10 processing fee

Packet pickup


Sports Basement Discount (20% Basementeers, 11% non-members)
Where: Sports Basement Berkeley (2727 Milvia St, Berkeley, CA 94703)
When: 2:00 p.m. - 6:00 p.m.
Directions: Google Maps 

**Athletes must bring a photo ID in order to pick up their packet

Where: Mare Island (850 Nimitz Ave, Vallejo, CA 94592)
When: 12:00 p.m. - 6:00 p.m.
Google Maps
** Athletes must bring a photo ID in order to pick up their packet

Where: Mare Island (850 Nimitz Ave, Vallejo, CA 94592)
When: 6:30 a.m. - 9:00 a.m.

Directions: Google Maps
Athletes must bring a photo ID in order to pick up their packet

**We recommend you arrive a minimum of one hour before your race 


The best address to use for directions is 850 Nimitz Ave, Vallejo, CA 94592. This will take you to Parking Lot G on Mare Island which is right in front of the Mare Island Brewing Company - Coal Shed location. All the parking is FREE and located within a short 1 to 3 minute walk to the start / finish. Parking is on a first come, first served basis.

The parking lots are all VERY close together so even if Lot G is full, you'll still be parking close to the start / finish! Here is an
 overview map of the parking locations. The closest lots are Lot G and Lot F. If those are full we recommend using Lot H, and then Lot C. Use the Google links below for directions to each lot. 

Parking Lot G (280 spaces)
Parking Lot F (60 spaces) - Enter from Connolly St
Parking Lot H (125 spaces)
Parking Lot C (250 spaces)


What do I need to bring to packet pick-up/registration?
Bring your PHOTO IDENTIFICATION (ID) or a copy of your ID in order to receive your packet. A valid driver’s license or a valid passport is best. Minors are not required to show a photo ID. 


Can I pick up my friend’s packet for them?
Yes! Bring a copy of their photo ID and we’ll give you their packet.  You may have a photo of your friend's photo ID on your phone.


Are we required to pick up our packets before race day?
No, but we strongly recommend that you do. This allows you to get ready for your race instead of waiting in a line on race day.

What time should we be there on race day?
Check-in opens at 6:30 a.m. We recommend you get there 60 minutes before your start time to park and get ready for the race. If you didn’t get your packet before race day, you may want to give yourself even more time.

How soon does one need to register for the event?
The earlier, the better. Mermaid events have sold out in the past. To guarantee your entry we recommend you sign up early. Plus, the prices increase as the event date gets closer.

If the event closes, will there be a waiting list?



If I cannot race, can I give someone else my race number?

No. Race entries are non-transferable. Giving your bib to another person creates a very dangerous situation as that person hasn't signed the waiver for the event. This can create a situation where you might be liable if something happens to that person at the race. WE ARE HAPPY TO OFFER A RACE CREDIT PER OUR CANCELATION POLICY IF YOU CAN'T ATTEND. 


How do I know you received my entry?

You should have received an email confirmation from the registration system. If you can’t find it, you can email us at We will verify your participation from our registration list.

Can I get a refund?

Unfortunately, there are no refunds. However, we do have an awesome cancelation policy. Email us at at least 10 days prior to the event and we’ll give you a credit toward a future race. The credit amount is your entry fee minus a $10 processing fee.


How many miles is 5K? 10K? Half Marathon?
The 5K is 3.1 miles, the 10K is 6.2 miles, and the Half Marathon is 13.1 miles.  

Is the course hilly?

The course is mostly flat. The 5K is entirely flat, but the 10K and the Half both have a climb that takes you up to the top of the Mare Island Preserve. There is about 275 feet of elevation gain in the 10K and the half has 430 feet of elevation gain. 

Is there is a time limit?

There is no time limit for the 5K or 10K. The Half Marathon does have a 3 hour and 40 minute cutoff. This equals approximately a 17:00/mile pace. For those needing additional time we will have offer a 7:00am early start. Participants who start early will receive a time but will not be eligible for awards.

Do you have aid stations? What kind of hydration/food is on the race course?

Yes, we have plenty of aid stations. Water, Ultima Replenisher electrolyte drink, and bars available at aid stations along the course.    


Can I run with a baby stroller?

Yes, you can run with a baby stroller. There are a couple very bumpy sections on the paved road which isn't ideal for strollers. Please note the Half course will go on a dirt path, so the ride will be bumpy. If you choose to use a baby stroller, please start towards the back of the pack at the start line. 

Do you have prizes for winners?
Yes! We will have an awards ceremony at the expo. Awards are given to the 1st, 2nd, and 3rd place overall female winners for each distance and 1st, 2nd, and 3rd place female winners of each age group. You must be present at the awards ceremony to pick up your award.  Awards will not be mailed out. We do not offer awards for male categories.

What are the Age Groups?

Mermaid Age Groups are currently 10 and under, 11-14 15-17, 18-19, 20-24, 25-29, etc. Age groups from age 20 and over are separated by 5 year increments.  


I belong to a club or organization. Do you offer group discounts?
Yes! Have your club president or representative email us at to get the discount code.

How many do I need in my group to be eligible for a group discount code?
6 or more.



Are men allowed to compete in a Mermaid event?
Yes! Men are encouraged and welcomed to participate. We do not offer age group or overall awards for men or boys. 

Do I have to wear my paper, race number?

Yes, you are required to run with your bib number. The bib is used for timing, identification, and race photos. 

I heard this event uses Chip Timing. What is Chip Timing?
Chip timing allows us to record your time using a computer and gives the most accurate results. Your timing chip is attached to your bib.

Results and photos

Photos will be available approximately one to two weeks following the event.

2023 photos

2022 photos

2019 photos

2018 photos

2017 photos

2016 photos

2015 photos

2014 photos

2013 photos

2012 photos

Event photography by: Facchino Photography specializes in off-road event photography. Capturing athletes in their moment and allowing them flexibility in viewing and ordering convenience.

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