Vashon Island Ultramarathon & Trail Run

JUN
5
2027
Trail ultramarathon on Vashon Island with 50K, 20 and 10 mile looped courses across mixed-surface park trails and forest.
Sat 5 Jun 2027
50 kilometers 20 miles 10 miles

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Vashon Island Ultramarathon & Trail Run

The event takes place on June 5, 2027 on Vashon Island, Washington. Races are offered over the following distances:

  • 50K three-loop course
  • 20 Miler two-loop course
  • 10 Miler one-loop course

All races start and finish at the Gateway Trail system near SW 178th and 103rd SW. The course travels interior and perimeter trails through Island Center Forest and nearby properties, and a map or GPX file will be emailed to entrants before the event because portions cross private land. The organizers limit the field to 200 participants.

Aid stations are located at approximately miles 6 and 10 and will be stocked with water, sports drinks, snacks, fruit, gels, and other items. Porta-potties are placed at 0, 0.5, 1.4 and 6 miles. Runners return to base camp roughly every ten miles where drop bags are available; one aid station will also receive drop bags by vehicle.

Terrain is mostly single track and double track park trails with some dirt roads, gravel, grass shoulders and short paved sections. Elevation change is about 770 feet per loop, with short steep hills and sections where roots, downed logs or quick turns affect footing. Trails are not closed to the public, so runners should expect to encounter equestrians, walkers and cyclists. The event is USATF sanctioned, organized by a Washington State nonprofit, and proceeds support island youth athletics. Visit the organization's website for the most recent information.

50 km
50k
20 mi
20 Miler
10 mi
10 Miler
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