Vashon Island Ultramarathon & Trail Run
Vashon, United States • 6 Jun 2026
Vashon Island Ultramarathon & Trail Run
The event offers trail races on Vashon Island with the following distances:
- 50K
- 20 Mile
- 10 Mile
All races start and finish at the Gateway Trail system near SW 178th and 103rd SW and follow loops that travel the interior and perimeter of Island Center Forest and adjacent properties. The course is primarily single track and double track park trails with sections of dirt road, gravel driveways, grass shoulders and short paved road. Elevation change is about 770 feet per loop, and the route includes short steep hills and some sections with roots, downed logs, and sharp turns.
Aid stations are located at miles 6 and 10; 50K runners will pass each aid station three times. Aid stations provide water, sports drinks, electrolytes, fruit, sandwiches, gels and a variety of snacks. Porta potties are placed at approximately 0, 0.5, 1.4 and 6 miles. The course is not closed to the public; runners may encounter pedestrians, bicyclists and equestrians and should yield to motorized traffic on roads.
The event is produced by a volunteer non-profit that limits entries to 200, operates under ATRA and USATF event standards and holds a USATF Safe Sport sanction. The race includes a team competition based on combined finish times in female, male and mixed categories. Runners 18 and younger have discounted registration and two scholarships are available. Visit the organization's website for the most recent information.