Saturday, November 8th, 2025
3 Mile, 6 Mile, 9 Mile, Half Marathon, 6 Hour Challenge (Individual & Relay),
Kids 1.5 Mile Dash & Virtual Run
Run, hike or walk at Huddart Park in beautiful Woodside, CA. Towering redwoods, lush trails and the magical forest await....
SWAG Options:
Sign up to get ALL the swag or you can customize your SWAG options during registration. Removing swag can save you up to $14. We are now offering the option to choose either a long or short sleeve shirt with your registration!
*Note: Opting out of the various swag items during your registration will reduce your entry fee at checkout.
Select: No Shirt - Save $8
Select: No Medal - Save $3
Select: No Necklace - Save $3
**Sirena 6 Hour Individual & Relay**
We're excited to continue the SIRENA 6 Hour again this year! Participants in the Sirena 6 Hour will challenge themselves to run or hike as many 3 Mile loops as they can within the 6 hour time limit. Challenge yourself as an Individual or part of a 2 Person Relay Team. Participants will have access to a designated crew/drop bag area along the finish chute and will also have access to a special 6 Hour Aid Station stocked with all the fun food and snacks needed to fuel for 6 hours of fun! We're talking pancakes, quesadillas, melons, and more.
Age Discounts:
*Age discounts automatically applied during registration
Registration fees
Prices are inclusive of mandatory charges, items, and fees
6 Hour Challenge (Individual)
Price changes in 20 hours 23 minutes-
Participants will have the challenge of seeing how far they can go in the 6 hour time limit. The course will be loops of the 3 mile distance.
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$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$91.86
Breakdown: $84.00 registration + processing fee
May 24 – Jul 14 -
$97.21
Breakdown: $89.00 registration + processing fee
Jul 15 – Sep 30 -
Register for 6 Hour Challenge (Individual)$102.56
Breakdown: $94.00 registration + processing fee
Now registering Oct 1 – Oct 31 -
$107.91
Breakdown: $99.00 registration + processing fee
Nov 1 – Nov 6 -
$118.61
Breakdown: $109.00 registration + processing fee
Nov 7 – Nov 8
-
6 Hour Challenge (2 Person RELAY - Price per person)
Price changes in 20 hours 23 minutes-
Your team of 2 will take turns running as many loops of the 3 mile course as you can in 6 hours.
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$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$59.76
Breakdown: $54.00 registration + $5.76 processing fee
May 24 – Jul 14 -
$65.11
Breakdown: $59.00 registration + $6.46 processing fee
Jul 15 – Sep 30 -
Register for 6 Hour Challenge (2 Person RELAY - Price per person)$70.46
Breakdown: $64.00 registration + $6.46 processing fee
Now registering Oct 1 – Oct 31 -
$75.81
Breakdown: $69.00 registration + $6.81 processing fee
Nov 1 – Nov 6 -
$91.86
Breakdown: $84.00 registration + $7.86 processing fee
Nov 7 – Nov 8
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Half Marathon
Price changes in 20 hours 23 minutes-
-
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$81.16
Breakdown: $74.00 registration + $7.16 processing fee
May 24 – Jul 14 -
$86.51
Breakdown: $79.00 registration + $7.51 processing fee
Jul 15 – Sep 30 -
Register for Half Marathon$91.86
Breakdown: $84.00 registration + $7.86 processing fee
Now registering Oct 1 – Oct 31 -
$97.21
Breakdown: $89.00 registration + processing fee
Nov 1 – Nov 6 -
$107.91
Breakdown: $99.00 registration + processing fee
Nov 7 – Nov 8
-
9 Mile
Price changes in 20 hours 23 minutes-
-
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$70.46
Breakdown: $64.00 registration + $6.46 processing fee
May 24 – Jul 14 -
$75.81
Breakdown: $69.00 registration + $6.81 processing fee
Jul 15 – Sep 30 -
Register for 9 Mile$81.16
Breakdown: $74.00 registration + $7.16 processing fee
Now registering Oct 1 – Oct 31 -
$86.51
Breakdown: $79.00 registration + $7.51 processing fee
Nov 1 – Nov 6 -
$97.21
Breakdown: $89.00 registration + processing fee
Nov 7 – Nov 8
-
6 Miles
Price changes in 20 hours 23 minutes-
-
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$59.76
Breakdown: $54.00 registration + $5.76 processing fee
May 24 – Jul 14 -
$65.11
Breakdown: $59.00 registration + $6.11 processing fee
Jul 15 – Sep 30 -
Register for 6 Miles$70.46
Breakdown: $64.00 registration + $6.46 processing fee
Now registering Oct 1 – Oct 31 -
$75.81
Breakdown: $69.00 registration + $6.81 processing fee
Nov 1 – Nov 6 -
$86.51
Breakdown: $79.00 registration + $7.51 processing fee
Nov 7 – Nov 8
-
3 Miles
Price changes in 20 hours 23 minutes-
-
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 24 – Jul 14 -
$54.42
Breakdown: $49.00 registration + $5.42 processing fee
Jul 15 – Sep 30 -
Register for 3 Miles$59.76
Breakdown: $54.00 registration + $5.76 processing fee
Now registering Oct 1 – Oct 31 -
$65.11
Breakdown: $59.00 registration + $6.11 processing fee
Nov 1 – Nov 6 -
$75.81
Breakdown: $69.00 registration + $6.81 processing fee
Nov 7 – Nov 8
-
Virtual Run
Price changes in 20 hours 23 minutes-
-
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 21 – May 23 -
$49.07
Breakdown: $44.00 registration + $5.07 processing fee
May 24 – Jul 14 -
$54.42
Breakdown: $49.00 registration + $5.42 processing fee
Jul 15 – Sep 30 -
Register for Virtual Run$59.76
Breakdown: $54.00 registration + $5.76 processing fee
Now registering Oct 1 – Oct 31 -
$65.11
Breakdown: $59.00 registration + $6.11 processing fee
Nov 1 – Nov 6 -
$75.81
Breakdown: $69.00 registration + $6.81 processing fee
Nov 7 – Nov 8
-
Mermaid Dash
Price changes in 20 hours 23 minutes-
Mermaid Dash for girls and boys under 12 years old. Entry fee does NOT include a t-shirt.
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$18.04
Breakdown: $15.00 registration + $3.04 processing fee
May 21 – May 23 -
$18.04
Breakdown: $15.00 registration + $3.04 processing fee
May 24 – Jul 14 -
$18.04
Breakdown: $15.00 registration + $3.04 processing fee
Jul 15 – Sep 30 -
Register for Mermaid Dash$18.04
Breakdown: $15.00 registration + $3.04 processing fee
Now registering Oct 1 – Oct 31 -
$18.04
Breakdown: $15.00 registration + $3.04 processing fee
Nov 1 – Nov 6 -
$23.39
Breakdown: $20.00 registration + processing fee
Nov 7 – Nov 8
-
PACKET PICKUP
Saturday, November 8th, 2025 (RACE-DAY) packet pickup:
Location: Huddart Park, 1100 Kings Mountain Road, Woodside, CA
Time: 8:00 a.m. to 9:45 a.m.
You must have a photo i.d. in order to pick up your packet
MERMAID DASH
Mermaid Dash
The Mermaid Dash is a great way to introduce girls and boys to trail running. The fun run/walk/hike allows youth to participate and experience the joy of crossing the finish line in a safe and supportive environment. Mermaid Dash athletes receive a finisher's medal, finisher's necklace, and post race food.
Parents are encouraged to let Mermaid Dash athletes run/hike on their own, however a parent or guardian is welcome to run alongside young or shy Mermaid Dash athletes.
Time: 11:00 a.m. (Ages 6 - 12)
Entry Fee: $15.00** (online)
Race Day: $20.00**
Distance: 1 mile
*Entry fee does NOT include a t-shirt.
PARKING
Parking at Huddart Park is limited. We encourage all participants to carpool to the event.
NOTE: THERE IS NO PARKING ON KINGS MOUNTAIN ROAD OR ALONG THE ENTRANCE TO THE PARK BEFORE THE RANGER'S HUT.
PLEASE BRING $6 CASH (EXACT CHANGE APPRECIATED)
Event schedule
- Sat, November 8, 2025 8:30 AM - Sirena 6 Hour
- Sat, November 8, 2025 8:45 AM - Half Marathon
- Sat, November 8, 2025 8:55 AM - 9 mile
- Sat, November 8, 2025 9:10 AM - 6 mile
- Sat, November 8, 2025 9:20 AM - 3 mile
- Sat, November 8, 2025 10:30 AM - Mermaid Dash (ages 6-12)
Contact information
- Event contact
- Mermaid Series
- Website
- Visit website
