Mud & Chocolate Half Marathon & 4.5-Mile Trail Run

Sunday, August 16, 2020 • Sammamish, WA • Course Map

Ready for a trail run that will take you tromping through Washington’s Soaring Eagle Regional Park just outside Seattle, whose more than 600 acres are filled with old-growth forests, wetlands as well as plenty of wild open space?

Then the Mud & Chocolate Trail Run races — which now take place here near Seattle in the spring, late summer and mid-fall — are likely calling your name.

Begun in 2009 with a single race in November that saw just over 140 runners cross the finish line in both the 13.1-mile and the 4.5-mile races combined through the Redmond Watershed, the Mud & Chocolate races — so named because the race organizers offer a chocolate aid station during the race as well as chocolate race medals and dessert at the chocolate table at the race finish — the races in 2012 expanded to three events, with races in April, August and November.

The August race retains the course that was offered at the first race back in 2009, and features both a 4.5-mile run and a half marathon.

Both races start in the parking area within this densely wooded park, which features roughly 12 miles of trails that lie above Sammamish Creek on the Sammamish Plateau, near the Snoqualmie River Valley.

Runners follow an out-and-back course for both races, and the half marathon follows a double-loop route through the park.

Race Weather & Climate

Located in northwest Washington state, just over 17 miles east of Seattle, Sammamish typically sees its warmest and driest weather of the year in August, when record temperatures here have fallen as low as 35°F (in 1945) and risen as high as 102°F (in 1960).

On race day (Aug. 16), the average low is 54ºF and the average high is 77ºF.

Course Map

See the map for the Mud & Chocolate August Half Marathon here.

Starting Time

  • 8:10 AM – 4.5-mile
  • 8:30 AM – half marathon


See race website


To reserve your spot in the late summer 2020 running of Sammamish’s Mud & Chocolate August Half Marathon or 4.5-Mile race, visit the event website below.

Official Race Website


Ever run in the Mud & Chocolate Half Marathon? Share your impressions here, or post your review in the Comments below.

See more races in: August, Washington