Set your sights on a personal best at the Tunnel Light Marathon on September 13, 2026, in North Bend, WA. Renowned as one of the nation's fastest courses and a top Boston Qualifier, this 26.2-mile event has historically offered a unique, point-to-point downhill journey. Runners traditionally started at Hyak in Snoqualmie Pass, embarking on a memorable 2.4-mile traverse through a dark, unlit railway tunnel that requires a headlamp. Emerging from the tunnel, the course typically followed a scenic, packed gravel "rails to trail" path, descending over 2,000 feet with a consistent 2.2% average decline through lush forests, past mountains, and stunning waterfalls.

The Tunnel Light Marathon, founded in 2007, has garnered a reputation for its breathtaking scenery and high percentage of Boston Marathon qualifiers, often exceeding 30%. Aid stations are typically spaced every 2-3 miles, providing essential hydration and fuel along the way. While the original course has been celebrated for its consistent downhill grade and potential for PRs, please note that due to recent storm damage, the 2026 race will utilize an alternative route, with details expected by February 1, 2026. Typical race day conditions in mid-September include comfortable highs around 65°F and lows around 49°F, with a 20% chance of precipitation, creating generally favorable running weather. The race culminates near North Bend, offering a rewarding finish to an unforgettable marathon experience.