Tunnel Light Marathon & Half
Run a fast, downhill marathon through a tunnel at Snoqualmie Pass.
Race Date
Sep 13, 2026
Location
Snoqualmie Pass, WA
Quick facts
- Date
- Sunday, September 13, 2026
- Location
- Snoqualmie Pass, Washington
- Distance
- Half marathon (13.1 mi) + 26.2M
- Course
- Point to Point
- Terrain
- Road
- USATF certified
- Not listed
Highlights
Good For
Atmosphere
Course
The Experience
The Tunnel Light Marathon & Half offers a unique and rapid race experience. Runners descend through a historic, mile-long tunnel before embarking on a course designed for personal bests.
This point-to-point race is celebrated for its potential to deliver fast times, with many participants aiming to qualify for the Boston Marathon. The course leverages the natural downhill grade from the tunnel exit, offering a swift journey through the Washington landscape.
While specific historical figures like field size and repeat runner rates are not available, the race is noted for its steady field trend and its appeal to those seeking a PR-friendly event. The typical race-day weather is mild, adding to the favorable conditions for a strong performance.
Race-provided description
One of the fastest marathon courses in the world. Come set a personal record, qualify for Boston, and enjoy a downhill mountain course through a tunnel.
Course Info
Course Type
Point to Point
Terrain
road
Scenery
Mountain
Surface
Paved
Difficulty
Ultra-Flat
Net Drop/km
0 m (Flat)
Separation
0.0%
Also Offers
Course Map
2 other maps for this race
Quality Score
first year
no finisher counts yet
small race — neutral
needs a few years of results
3 timing sources · 13 photos
no finisher data yet
no winner time yet
typical high 66°F
Race Day Weather
5-year historical avgStart (Low)
50°
Afternoon (High)
66°
Pleasant conditions — light layers at start, comfortable by finish
0.0"
Precipitation
9 mph
Wind
78%
Humidity
Race Photos
Frequently asked
When is the Tunnel Light Marathon & Half?
The Tunnel Light Marathon & Half is held on Sunday, September 13, 2026.
Where does the Tunnel Light Marathon & Half take place?
It takes place in Snoqualmie Pass, Washington.
What distances does the Tunnel Light Marathon & Half offer?
The half marathon (13.1 miles), plus 26.2M.
Is the Tunnel Light Marathon & Half course flat and good for a PR?
The Tunnel Light Marathon & Half is a ultra-flat, point to point course.
HalfRuns editorial — independent, no paid placement.
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