Tunnel Light Marathon & Half
Tunnel Light Marathon & Half is a running race on September 13, 2026 in Snoqualmie Pass, WA.
- Date
- September 13, 2026 (16 days to go)
- Sport
- Running
From the Organizer
Tunnel Marathon & Half Marathon-Fast. Scenic. Boston Built. Iconic. Unforgettable.
The Tunnel Marathons deliver one of the fastest marathon & half marathon experiences in the country. With a steady downhill grade and low starting elevation, this course is engineered for speed — an ideal opportunity to set a Personal Record, earn a Boston Qualification (marathon), or run your first race.
From the moment you enter the historic Snoqualmie Tunnel to the final miles surrounded by mountain views, waterfalls, and crisp Washington air, the Tunnel Marathons are as breathtaking as they are fast. The Tunnel Marathon & Half Marathon offers one of the fastest and most unique race experiences in the Pacific Northwest.
2026 Course Update
Due to severe storm damage, the 2026 event will follow an alternate, fully permitted route.
The 2026 course will:
-Remain fast and scenic
-Features approximately 1,000 feet of net elevation drop (marathon & Half)
-USATF-certified, and the marathon is a Boston Qualifier
While the finish differs from the traditional course, 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.
A Proven Boston Qualifier (Marathon)
The original marathon course ranked in the Top 10 nationwide for Boston Qualifiers (Runner’s World and RaceRaves) and has helped more than 42% of participants earn a BQ. In 2026, expect the same professional organization, safety standards, and fast course design that define the Tunnel experience. Come run fast. Come run iconic. Come find your light at the end of the tunnel.
We offer three races; choose your day:
Light at the End of the Tunnel Marathon & Half – June 7, 2026
Tunnel Vision Marathon & Half – August 9, 2026
Tunnel Light Marathon & Half – September 13, 2026
Built for Speed:
-Approximately 1,000 feet of net downhill
-Smooth, packed gravel surface (road or light trail shoes work well)
Registration Includes:
-Professional chip timing
-Custom race bib
-Finisher’s shirt and medal
-Post-race food and festivities
-Shuttle transportation back to Hyak Sno-Park
Shuttle & Finish:
After finishing at Garcia Trailhead, runners will enjoy a scenic one-mile walk down Forest Service Road 9020 to the shuttle buses. Shuttles return participants to Hyak for celebration and refreshments.
What to Know:
-Headlamps are required for the Snoqualmie Tunnel
-Course surface is packed gravel
-Aid stations every 2–3 miles with water, electrolytes, first aid, and Honey Stinger gels at select locations
Events
Weather
Typical Conditions
It's too far out for a forecast, so here's what weather on this date is normally like in the area. A race day forecast will replace this as race week approaches.
Typical High
64°
Typical Low
47°
Chance of Rain
31%
Based on US Climate Normals data from Stampede Pass, 12 mi from the venue.
Host City
About Snoqualmie Pass, WA
City Elevation
3,353 ft
Nearest Airport
BFI
King County International Airport - Boeing Field · 41 mi
Major Hub
SEA
Seattle–Tacoma International Airport · 41 mi
Time Zone
Pacific Time
From Endurance Grid
Line up lodging and travel early to lock in your race weekend.
Race Location
Your Next Start Line
What Are You
Waiting For?
Every finish line starts with a single decision. Claim your spot at Tunnel Light Marathon & Half, put it on the calendar, and turn “someday” into a start date.
16
Days to train
- Race
- Tunnel Light Marathon & Half
- Date
- September 13, 2026
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From Endurance Grid
About This Sport
Endurance Grid is here to help you understand the sport, decide if it’s the right fit, and learn how to prepare. For course distances, logistics, and race-day specifics, always defer to the race organizer’s event page.
With running, there's a distance for every fitness level, a community at every start line, and nothing beats the feeling of crossing a finish line you trained for.
Running is an endurance sport that rewards consistency, and showing up every week compounds in ways that will surprise you.
Running
From 5K to marathon, running races are an accessible entry point into endurance sport. There's a distance for every fitness level and a community at every start line.
Coming Up
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Frequently Asked Questions
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Tunnel Light Marathon & Half
Sep 13, 2026