Hyak Passage 25K is a welcoming mountain trail race starting and finishing at Hyak Trailhead on Saturday, October 3, 2026. Run 15.5 miles with approximately 1,800 feet of gain, pass through the completely dark 2.25-mile Snoqualmie Tunnel twice, and climb rooty, rocky singletrack to Annette Lake. A headlamp is required. Two staffed aid stations and 7.5 hours of course support. Entry is $139 through September 14 and $155 September 15 through October 2, with no added registration-platform fee. Registration includes aid support, drop-bag service, professional race photography, a post-race meal, and a finisher award. Formerly Rainshadow Running's Hyak Halloween 25K, the same tunnel-to-lake course continues under Cielo Running in 2026. Cielo Running is a family-owned and BIPOC-owned Pacific Northwest trail race company owned and directed by Lauro Silva. Bib pickup opens at 8:00 AM and the race starts at 9:00 AM.

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