Grand Ridge 5M, Half-Marathon, Marathon and 50K Trail Run

May 2, 2015 in Issaquah, Washington

Register on Webscorer

Online pre-registration closes 4/20 at 11:59pm. 


Join us for spring in the Pacific Northwest for a trail run at Grand Ridge Regional Park! This park is a well-hidden jewel located just across I-90 from Tiger Mountain.


The course starts and finishes at Grand Ridge Trailhead, just off I-90 at Exit 20 (see directions tab) in Washington. It begins with a wide double-track trail until you head north into the hills on the recently built singletrack trails. These are some of the nicest trails we have encountered in the Northwest.


We offer 5 Mile, Half-Marathon (13.1 miles), Marathon (26.2 miles) and 50K trail run options. The aid stations are fully stocked with water, Nuun, Clif product, PBJ sandwiches, fruit, cookies, crackers, and pretzels. As always, at the finish there will be a full variety of post race foods awaiting you.



Already signed up? Share our event with your friends on Facebook.


5 Mile - $30

Half Marathon - $41

Marathon - $48

50K - $53


* Add $5 after 4/18 11:59pm, add $10 day-of if event has not sold out.



The race will be held at Grand Ridge trailhead, Exit 20 off of I-90 in Issaquah. Address is 27000 SE 79th St, Issaquah, Washington 98027. If you are coming from I-90 Eastbound, take Exit 20 High Point way and take a right. If you are coming from I-90 Westbound take a left. Parking is along the road from the start location outward, and since there will be many runners, please make sure to arrive early so you have plenty of time to walk to the race start. We also encourage you to carpool.


Start times:  50K and Marathon: 8.00 am (no early starts)

Half-marathon: 9.00 am, 5 mile: 9.30 am

Pre-run briefing 15 minutes before each start

Day of run registration and check in: 7.00 am-start

Course closure: 5.00 pm


Course Map

5 Mile Course

Click on image to enlarge.


Trail Running at Grand Ridge Park in Issaquah WashingtonThe 5 Mile Loop is essentially one large lollipop loop that starts 0.5 miles after the Start and follows singletrack trails up to the Issaquah Highlands ballfields and back down. The singletrack trails are fairly wide and passing runners should not be an issue. The courses will be well marked with streamers, turn flags and direction signs at intersections.


5 Mile Course: Blue, clockwise Green, Blue, elevation gain 750 feet.

Half-marathon/Marathon/50K Course

Click on image to enlarge.

Trail Running at Grand Ridge Park in Issaquah Washington

The Half-marathon is a lollipop loop with an extension that traverses Grand Ridge and back. Follow Blue, Green and Purple out, Purple, Yellow and Blue back. Elevation gain is approximately 2000 feet.


The Marathon course is two loops of the Half Marathon Course. See here for Kevin Yetman's GPS profile.


On the 50K course you will do two half-marathon loops, then a 5 mile loop for a total of 31.2 Miles (50K).


The course will be very well marked and intersections labeled with arrows to ensure runners do not get lost. Elevation gain is about 5050 feet for the 50K.


Read about how we keep the races green here.


We are dedicated to the responsible enjoyment and active stewardship of the outdoors, and we encourage you to "leave no trace behind" by taking all trash with you. The park rangers always appreciate it when racers follow the marked course and keep the trails clean, and they are much more likely to grant permission for us to put on races at the same location if the trails are kept in good condition.


The trails will be open to other users during the event, hikers and cyclists. Please be courteous, you will unlikely encounter more than a few. Where the trails are narrow, please let other participants pass you if they want to get by. It is a passing runner's job to tell the person in front that they wish to pass.


For refunds/cancellations please see our policy.


Photos and results from trail runs previously held can be found on the photos page and results page respectively.

Produced by 4th Dimension Racing