Cougar Mountain Trail Run Series

Bellevue, United States • 8 Aug 2026

Cougar Mountain Trail Run Series #4

The Cougar Mountain Trail Run Series #4 is a community trail running event held in King County’s Cougar Mountain Regional Wildland Park in Newcastle, WA. The series has raised over $250,000 for King County Parks and contributed many hundreds of hours of volunteer trail work. The event is organized by local running groups and race organizers as part of an annual series.

Distances offered:

  • 5k
  • 14.5 miles
  • 26.2 miles

The courses run through forested terrain with rolling, runnable hills. Trails vary from narrow, technical single-track to wider, groomed routes, and the routes pass through lush forest, fern-lined single-track, over hills, and along marshes. The park is located about 15 minutes from Seattle.

Online pre-registration is available until August 5, and event-day registration is also offered. Course maps and more detailed maps for Cougar Mountain are provided by the park and the race organizers.

Aid stations are located along each course. The 5k has an aid station at about 1.2 miles (no cut-off). The 14.5-mile course has aid stations near 3.0, 4.6, 7.1, and 10.3 miles. The 26.2-mile course has aid stations near 5.4, 6.9, 10.7, 14.2, 18.3, and 24.8 miles; some stations include time cut-offs.

The race participates in the Pacific Northwest Youth Trail Project; youth compete alongside adults and score points in age and gender categories for a regional series. Series standings require at least three results within either the Short Series or the Long Series; results from the two series may not be combined. Visit the organization's website for the most recent information.

Race information

50 km
50k
26 mi
26.2 Miles
20 mi
19.5 Miles
15 mi
14.5 Miles
11 mi
10.8 Miles
8 mi
7.6 Mile Cross Country
8 mi
8.2 Miles
5 mi
5.1 Miles
3 mi
Visit the organization's website for the most recent information.
Trail runs nearby

Experience a flat and fast USATF certified race along the Cedar River in Maple Valley featuring scenic trestles and limestone paths. Finishers enjoy a medal and hot chili after completing their choice of a half marathon 10k or 5k.

A Spartan obstacle race weekend at Meadow Wood Equestrian Center in Snohomish WA on May 2 and 3 2026. The event uses wooded dirt trails beside the Snohomish River and includes Sprint 5 km, Super 10 km and a Kids Race.

Tiger Claw is a multi route trail event on Tiger Mountain near Issaquah on May 8 and 9, 2026. It features a *50k* plus Ascent, Big Cat and Ambush routes, and requires completion of three summit loops within the event cutoff.

Explore the trails of Bainbridge Island. This May event offers 10K and 5K courses through Battle Point Park, the Forest to Sky Trail, and the Grand Forest, plus a Kids Fun Run. All proceeds support local trail development.

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