Tunnel Marathons

Sunday, September 13, 2026 · Palouse to Cascades State Park

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Tunnel Marathons is a downhill trail marathon at Snoqualmie Pass that qualifies runners for Boston. If you're chasing a BQ or just want to run a mountain marathon on a Sunday in September, this is the event—it's at Palouse to Cascades State Park on the 13th.

Recurs: held in June, August, and September

Venue

Palouse to Cascades State Park

Palouse to Cascades State Pk Trl, Snoqualmie Pass, WA 98068, USA · Snoqualmie Pass

parks.wa.gov Map →

Tunnel Marathons

Venue

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