Interlaken Icicle Dash
Seattle, United States • 31 Jan 2026
Event overview
Interlaken Icicle Dash is a trail running event in Interlaken Park, Seattle, WA, held on January 31, 2026. It is the seventh and final event in the 2025-26 Winter Trail Series. Distances offered include:
- 5k
- 10k
The Winter Trail Series scores participants based on their best four performances. Participants who complete four or more series events earn a pair of limited edition Winter Trail Series socks. Series awards are given in multiple categories, including Female, Open, Masters, Junior, and Youth. A runner must have at least three scored events to be eligible for series awards.
Course and logistics
The course follows an out-and-back pattern on Interlaken Boulevard, a tree-canopied, paved road closed to car traffic, then climbs a short staircase onto dirt trails and returns to the boulevard. Each loop measures 2.5 km; the 5k is two loops and the 10k is four loops.
An aid station at the start/finish provides water, electrolyte drink, and carbohydrate or salty foods. 5k runners pass the aid station at 2.5 km; 10k runners pass it at 2.5 km, 5 km, and 7.5 km. The event begins near 21st Ave E and E Interlaken Blvd, with street parking adjacent to check-in and the start/finish area. Visit the organization's website for the most recent information.