2026 Race Dates
(registration will open on February 13, 2026)
June 7th, August 9th, and September 13th, 2026
2026 Course Update
Due to storm damage, the 2026 events will follow an alternate, fully permitted route.
Key Details:
Approximately 1,000 feet of net downhill (marathon & half)
USATF-certified courses (certification finalized after snowmelt in May)
Marathon remains a Boston Qualifier (no time penalty)
While the finish location differs from the traditional route, the spirit of the Tunnel Marathons remains unchanged — a smooth downhill rail trail, stunning Pacific Northwest scenery, and the unforgettable run through the Snoqualmie Tunnel.
Original Course Records:
Male: Grant Martin (2024) – 2:25:01
Female: Chelsea Barr (2022) – 2:42:46
Race Reviews
Trish LaliberteGorgeous trail with great mountain views. Awesome volunteers and yummy food. Loved the ice bath afterwards awwww. Highly recommended especially if you want to PR or BQ.....fast downhill coarse.
P.A.I beat my last marathon by 20 MIN! This truly is a great course for a PR and a BQ attempt.
Edward GuelfiAmazing race. Beautiful course with awesome volunteers. I got a pr and a BQ.
Rocky ChristenberryBeautiful run and wonderful experience even running in the rain! would definitely do again!
Helen MillsJust ran my first Tunnel Marathon and had a fabulous experience (plus a 20 min PR and a BQ!). Well organized, great route. Loved the finish line! Loved the cold water tank and the massages!