Would you start your goal marathon in total darkness?
Every summer, runners across the Northwest say yes at the Tunnel Marathons—a three-race series that has quietly become one of the most reliable PR and Boston-qualifier opportunities in the country. In 2026, the dates are set for June 7, August 9, and September 13, giving runners three chances to chase something big. And now, a new half marathon accompanies these races too!
Check out our recap of the 2025 event!
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2.4 Miles in the Dark
The day begins at Hyak Sno Park near Snoqualmie Pass. From there, you line up on the John Wayne Pioneer Trail. The full marathon does a 6.55-mile out-and-back section heading AWAY from the famed Snoqualmie Tunnel before turning around and heading back towards the tunnel (the half runners will head pretty much straight into the tunnel). Then begins the famed journey into the 2.4-mile darkness.
Within 50 yards, daylight disappears. Headlamps reflect off damp tunnel walls. Footsteps echo. Ahead, a small circle of light becomes your focus point, more than two miles away.
You don’t just run through the tunnel. You run toward the light.
Then you emerge into fresh mountain air and begin a steady flat run with the final half of the marathon getting you into the downhill running. And thus, there’s an important update.
The 2026 Course Update
Due to storm damage along sections of the traditional route, the 2026 events will utilize a fully permitted alternate course. In the Pacific Northwest, weather sometimes writes its own script. While course changes can feel like a curveball, the core elements that make this race special remain firmly in place.
Runners can still expect:
- Approximately 1,000 feet of net downhill (marathon and half marathon)
- USATF-certified courses (certification finalized after spring snowmelt in May)
- A Boston Qualifier marathon — now with no time penalty applied
- A smooth rail-trail surface built for rhythm and speed
The finish location will differ from previous years, but the spirit of the event remains unchanged: steady downhill miles, forested Pacific Northwest beauty, and one unforgettable tunnel start.
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Built for Boston (and Beyond)
Let’s be clear—this isn’t a gimmick built around a cool photo op. The Tunnel Marathons are engineered for performance.
The point-to-point design, net downhill profile, and hard-packed gravel surface create a course where runners can settle into flow and hold pace. In past years, a significant percentage of participants have hit Boston qualifying times—and with the updated 2026 route eliminating the prior time adjustment, the opportunity becomes even more appealing.
If you’re serious about a BQ, this race deserves a hard look.
Forest Miles & Flow State
After exiting the tunnel, runners cruise through Iron Horse State Park and connect to the Snoqualmie Valley Trail. Think towering trees, filtered light, and long stretches where you can simply lock in and go.
The downhill is steady but manageable—not reckless quad-crushing drops, but a sustained grade that rewards smart pacing. Aid stations (9 total), restroom stops, and drop bag service (perfect for ditching your headlamp) are spaced thoughtfully throughout.
Why Oregon Runners Keep Coming Back
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While the series takes place just north of us in Washington, it has become a staple for many Oregon runners chasing fast times without hopping on a plane. It’s close enough for a weekend trip, but unique enough to feel like an experience.
You start in darkness. You chase light. You spend run toward a goal you’ve likely been building toward for months.
Storms may shift the route, but the mission stays the same – three shots in 2026 to find out what’s waiting at the end of your tunnel.
