The Carkeek 12 Hour is an ultra event held on Saturday, October 24, 2026. It is located at 950 North West Carkeek Park Road in Seattle, Washington.
Sat, Jun 13, 2026 at 8:30 AM
Race Information
The race starts at 8:30 AM.
Packet pickup starts 30 minutes before the race and ends 10 minutes before the race starts.
All runners must register on RunSignup.
No on-site
registration.
Additional Information
Park at the North Creek Trail.
5K & 10K Course (0.78M)
https://www.mapmyrun.com/routes/view/6634249787
The course is an out-and-back (1.56M)
The 5K does the out-and-back two times.
The 10K does the out-and-back four times.
Half Marathon Course (1.09M)
https://www.mapmyrun.com/routes/view/6634249965
The course is an out and back. (2.16M)
Half Marathon does the course six times.
Course Time Limit
3 hours and 30 minutes.
Finisher Medals
https://usroadrunning.com/FinisherMedals.php
Shirt and Gear Shop
https://usroadrunning.com/Gear.php
Best Costume
https://usroadrunning.com/BestCostume.php
Series Points
https://usroadrunning.com/S.php
Awards
https://usroadrunning.com/Awards.php
Frequently Asked Questions and Information
https://usroadrunning.com/FAQ.php
US Road Running
5k 10k 13.1 Miles Run Trail
Sat, Jun 13, 2026 at 9:00 AM
Welcome to the 2026 edition of the Cougar Mountain Trail Run Series, put on by Seattle Running Club and Northwest Trail Runs. Our events support King County Parks, with $15 of every entry going to KC
Parks.
Events
May 9: 5.1 Miles & 10.8 Miles
9 AM start for all races, 12:00 PM cut-off (~16:40 pace for 10.8 miles)
June 13: 5K, 8.2 Miles & 14.5 Miles
9 AM start for all races, 1:00 PM cut-off (~16:35 pace for 14.5 miles)
July 11: 5K, 10.8 Miles & 19.5 Miles
9 AM start for all race, 2:30 PM cut-off (~16:55 pace for 19.5 miles)
August 8: 5K, 14.5 Miles & 26.2 Miles
8:30 AM start for the 14.5 and 26.2, 9 AM start for the 5K, 4 PM cut-off (~17:10 pace for the marathon)
October 24: 5K, 7.6 Mile Cross Country, 19.5 Miles & 50K
8 AM start for the 19.5 and 50K (7 AM early start will be available), 9 AM start for 7.6 Miles and Cross Country event, 9:30 AM start for 5K, 5 PM Cut-off (~17:25 pace for 50K, ~19:30 pace for early start)
Series (BEST 3 OUT OF 4 RACES is eligible for awards):
Short Series: May 5.1 Miles, June 8.2 Miles, July 10.8 Miles & August 14.5 Miles
Long Series: May 10.8 Miles, June 14.5 Miles, July 19.5 Miles, August 26.2 Miles
Top overall Man, Woman, and Nonbinary runners based on cumulative time will receive an award and free entry into next year's series.
If you are a Seattle Running Club member and want to use your membership discount on the short or long series, please signup for the series using the short pass or long pass and then send the race director ([email protected]) an email with your SRC member number. You will receive a partial refund within 5 business days. For all other races, please use the coupon code given to Seattle Running Club members--if you do not know the member code, please email the race director with your member number to get the code).
Online registration closes at 11:59 PM PDT the Wednesday before each event. We will have day-of registration if you did not register in time.
Reasons to Sign Up
Well-marked trails with distances that are perfect for all experience levels
Community: Surround yourself with members of the trail-running community
Post-race food and libations, including beer provided by one of our Club's partner stores, Flying Lion Brewery
Raise money for King County Parks: $15/runner donated to the parks
Safety Guidelines
If you are showing symptoms of any illness or disease, please skip this race. Email [email protected] for other race options or it's a much appreciated donation!
We Run on Native Land
We acknowledge that our running opportunities are built on the purposeful removal of Native peoples, who have been the stewards of Seattle-area lands for thousands of years. Thus, we accept our ethical responsibility for the ongoing stewardship of the land and purposeful support of Native neighbors, colleagues, businesses, and tribes. The Muckleshoot, Duwamish, Stillaguamish, Snoqualmie, and Coast Salish are the Natives of the lands we run on.
Photo Consent
I understand and accept that photos/videos/illustrations may be taken of me and/or my personal property while attending/participating in Seattle Running Club (SRC) events/functions. I acknowledge and agree that such photographs or other illustrations may be used by SRC and its related entities for advertising and promotional purposes in any medium, without compensation to me. If you would prefer not to have a particular photo used, let us know and we’ll do our best to remove it right away.
A Greener Event: Cup Free - Again, this year the series is continuing to reduce the amount of trash created during the event. We ask that runners bring a refillable water container with them on the trail to use at aid stations along the way. Our friends at Seven Hills Running, Fleet Feet Sports Seattle Ballard, and Snoqualmie Running have a variety of hydration products.
Race Information -Thanks to runners like you, the Cougar Mountain Trail Run Series has raised over $265,000+ for King County Parks and contributed hundreds of hours of trail work. Join Seattle Running Club and Northwest Trail Runs in carrying this legacy forward and making this 22nd annual event bigger and better than ever!
Just 15 minutes from Seattle, King County's Cougar Mountain Regional Wildland Park is one of the most popular training grounds for area trail runners and the Seattle Running Club. The course builds on itself throughout the series and brings runners through a lush forest of fern-lined single-track trails, over hills and along marshes and wetland habitats. This is a great series to supplement the training regime for a fall marathon or ultra. Cougar Mountain features rolling hills, a few moderate climbs, and a few steep but short inclines.
The summer Short Series and Long Series races are held on the 2nd Saturday of May, June, July, and August. The Fall races are held on the last Sunday in October. Series standings are updated after each month's races and everyone competing in each successive distance is eligible for Series awards (best 3 out of 4 races is eligible for awards!). There is a participant cap and the races tend to sell out, so register early! There are NO REFUNDS!
Seattle Running Club Discount
If you are a member of Seattle Running Club, you should have received a discount code for 20% in the newsletter. You will need to provide your member number if you use this discount code. There are also many other discounts and benefits for being a member of the Seattle Running Club.
No Dogs
As much as we love our four-legged friends and family members, we are not allowed to have dogs at our event.Very important announcement: Dogs are not allowed on the course due to Insurance Requirements. Despite the park's policy on dogs on leashes being acceptable, insurance has determined dogs on course cause a potentially unsafe environment for participants and spectators.
Awards
The top 3 Men, Women, and Nonbinary Runners in each event will receive a podium prize.
3.1 Miles 8.2 Miles 14.5 Miles Run Trail Ultra
Sat, Jun 20, 2026
Ready to take on the ultimate running challenge 😃? Join the Seattle Summer Marathon, the must-attend event for all running enthusiasts! Whether you're a fan of road racing, be it 5K, 10K, a half-marathon, or a full marathon, there's a distance for everyone.
5k 10k Half Marathon Marathon Run
Sat, Jul 04, 2026 at 8:30 AM
Please note that our race location has changed.
We will now be at McCollum Park Athletic Field instead of Langus Riverfront Park.
Race Information
The race starts at 8:30 AM.
Packet pickup starts 30
minutes before the race and ends 10 minutes before the race starts.
All runners must register on RunSignup.
No on-site registration.
Additional Information
Park at the North Creek Trail.
5K & 10K Course (0.78M)
https://www.mapmyrun.com/routes/view/6634249787
The course is an out-and-back (1.56M)
The 5K does the out-and-back two times.
The 10K does the out-and-back four times.
Half Marathon Course (1.09M)
https://www.mapmyrun.com/routes/view/6634249965
The course is an out and back. (2.16M)
Half Marathon does the course six times.
Course Time Limit
3 hours and 30 minutes.
Finisher Medals
https://usroadrunning.com/FinisherMedals.php
Shirt and Gear Shop
https://usroadrunning.com/Gear.php
Best Costume
https://usroadrunning.com/BestCostume.php
Series Points
https://usroadrunning.com/S.php
Awards
https://usroadrunning.com/Awards.php
Frequently Asked Questions and Information
https://usroadrunning.com/FAQ.php
US Road Running
5k 10k 13.1 Miles Run Trail
Sat, Jul 04, 2026 at 9:00 AM
The "Woodinville July 4th 5K" and Kids dash is helping to raise money for the Northshore Senior Center and their Northshore Inclusion Program which supports individual with Intellectual Disabilities
in the our area.
It's time to celebrate our Independence Day and the coming of summer. What a great way to start of the family activities of summer and the outdoors with a run or walk along our beautiful Sammamish River Trail. Whether you are a runner, power walker or casual stroller, this is a great event for you and your family. We will start things off with a 6 year old and under Kids Dash and then get into the main 5K event. It will be a great morning! We will have prizes for the most patriotic costumes. Best Family, Best Youth and Best Individual. Come dressed to impress.
So break out the suntan lotion, put on your best beach or "red, white and blue" running attire and join us for a fun filled morning.
3.1 Miles 5k Run Trail Walk
Run
PO Box 762, Mercer Island, Washington, 98040, United States