Snoqualmie Valley Half Marathon

JUN
20
2026
A flat, USATF-certified out-and-back on the Snoqualmie Valley Trail that highlights farmland and old-growth forest, offering a 10K and a half marathon with cupless aid stations and park-based start and finish.
Sat 20 Jun 2026
Half Marathon 10 kilometers

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Snoqualmie Valley Half : course and event details

The Snoqualmie Valley Half uses the Snoqualmie Valley Trail and begins and finishes at King County’s Tolt MacDonald Park in Carnation, WA. The route passes through agricultural land, old-growth forest, and a connector trail along the Tolt River. The surface is described as smooth and non-technical and the course is USATF certified (Half: WA16003RMB; 10K: WA16002RMB).

The half marathon follows an out-and-back pattern: it leaves the park, joins the Snoqualmie Valley Trail near mile 1.25, continues on the trail for the out section, then turns around and retraces the same route to finish at the park.

Distances offered

  • 10K
  • Half Marathon

On-course support for the half includes aid stations with water, electrolyte drink (Tailwind), and GU gels at approximately miles 2.9, 5.9, 7, and 10.2. Portable restrooms are located at several points on course; for the half these are listed near miles 2, 2.9, 10.2, and 11.1. The 10K has aid stations near miles 2.9 and 3.3 with portable facilities at the aid station.

Event logistics note that the race operates cupless aid stations to reduce waste; participants are encouraged to carry reusable hydration. Parking is available at Tolt MacDonald Park, Tolt Middle School, and downtown Carnation; when the park fills, additional parking requires a short walk into the park. Overall awards are given to top three male, female, and non-binary finishers by gun time, with age-group awards in five-year increments. The event names Issaquah Food and Clothing Bank as its charity partner. Visit the organization's website for the most recent information.

Half Marathon
1/2 Marathon
10 km
10k