Tunnel Light Marathon
Tunnel Light Marathon descends from the Snoqualmie Tunnel onto the Palouse to Cascades Trail, creating a fast September Boston qualifying course.
Quick facts
- Net-downhill Washington Boston qualifier
- Run through the Snoqualmie Tunnel
- September edition of the Tunnel Marathons
- Rail-trail course toward North Bend
About the Tunnel Light Marathon
Tunnel Light is the September race in Washington's three-edition Tunnel Marathons series. Its own date and registration distinguish it from the June and August events, despite the shared course family.
Course
After the dark, cool Snoqualmie Tunnel, runners follow a net-downhill rail trail toward North Bend. A headlamp is essential underground, and sustained gentle descent rewards restrained early pacing.
Race-day weather
Mountain air at the start may be cool and damp while the lower finish turns warmer. Tunnel moisture, trail dust, sun and changing temperatures can all appear in one race.
Past Tunnel Light Marathon dates and results
| Year | Date | Status | Results |
|---|---|---|---|
| 2026 | Sunday, September 13, 2026 | Results available | Open results |
| 2025 | Sunday, September 14, 2025 | Results available | Open results |
| 2024 | Sunday, September 8, 2024 | Results available | Open results |
Your race experience
Ran the 2026 Tunnel Light Marathon?
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Tunnel Light Marathon FAQ
When is the Tunnel Light Marathon?
We're waiting for the finalized date for the 2027 Tunnel Light Marathon. The most recent running was on Sunday, September 13, 2026.
Is Tunnel Light Marathon a Boston qualifier?
Yes. Tunnel Light Marathon is a Boston Marathon qualifier. To use the result, you must run the certified full-marathon course within the qualifying window and meet the current standard for your age and gender. Meeting the standard lets you apply but does not guarantee entry, and net-downhill courses can receive a time adjustment under current B.A.A. rules. Review the Boston qualifying times and downhill-course rules, or browse upcoming Boston qualifier marathons.
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