Vashon Island Ultramarathon & Trail Run
Vashon, United States • 6 Jun 2026
Event overview
The Vashon Island Ultramarathon & Trail Run takes place on Vashon Island, WA, based at the Gateway Trail system near SW 178th and 103rd SW. The event offers the following distances:
- 50K
- 20 Miler
- 10 Miler
Registration opens October 10, 2025. The event limits entries to 200 participants. It is organized by a Washington State non-profit (IRS 501(c)(3)) and follows ATRA event standards and a USATF sanction. The race is Trail Sister Approved and includes youth discounts for runners 18 and younger; two scholarships are available for qualified applicants. Day-of-race registration is available with priority given to the 50K field.
Course, aid stations and logistics
All races start and finish at the same location and use a looped course through Island Center Forest and surrounding parkland. Terrain is mainly single-track and double-track trails with some dirt roads, gravel, grass shoulders and short paved sections. Elevation change is about 770 feet per loop and the course includes some steep hills and sections with roots or downed logs. The course is not closed to the public; runners should expect equestrians, pedestrians and bicyclists and yield to motorized traffic on roads.
Aid stations are located at miles 6 and 10; 50K runners will pass each aid station three times. Aid station supplies include water, sports drink, soda, electrolytes, fruit, sandwiches, gels and snacks. Porta-potties are placed at 0, 0.5, 1.4 and 6 miles. Drop bags can be left at base camp and at Aid Station 1. Live tracking is provided through UltraSignup. Camping on the Friday before the race is available in the start/finish field with porta-potties and water jugs. Visit the organization's website for the most recent information.