Tunnel Light Marathon
Race Day Weather
Mild start, warming trend
Runners will face a temperature rising from 52°F to 69°F during the race, with average humidity at 61% and a dew point of 48°F. Light wind from the W will be a non-factor for pacing. Runners should consider adjusting their pace as the temperature increases and stay hydrated throughout.
Pace Calculator
Get forecast alerts for Tunnel Light Marathon
We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.
Race Info
The Tunnel Light Marathon offers runners a thrilling point-to-point course from Snoqualmie Pass to North Bend, Washington, featuring a 2.4-mile unlit tunnel that requires headlamps. With a net elevation loss of over 2,000 feet and a consistent 2.2% downhill grade, this USATF-certified marathon is renowned for facilitating personal records and Boston Marathon qualifications. The route showcases the stunning Pacific Northwest scenery, including mountain and waterfall views, as it winds through lush forests on a smooth, packed gravel trail.
