Tunnel Light Marathon

North Bend, WA, USA · September 13, 2026

55°·69° high·Light·Dry

Weather

Race Day Weather

55°at start

69° high

Light

Dry

Cool start, warming trend

Runners will face a temperature rise from 52°F to 69°F throughout the race, with humidity averaging 61%. Winds will be light at 5 mph from the W, becoming gusty at times. It’s advisable for runners to start conservatively and stay hydrated as they adjust their pace for the warmer conditions later on.

Race day forecast available in 114 days

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Distance: 26.2mi

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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.

Website

Course Map

FAQ

When is the 2026 Tunnel Light Marathon?

The 2026 Tunnel Light Marathon will be held on Sunday September 13, 2026.

Is the Tunnel Light Marathon a Boston Marathon Qualifier?

Yes, the Tunnel Light Marathon is an official Boston Marathon qualifier.

What will the weather be like for the 2026 Tunnel Light Marathon?

The forecast calls for a high of 71°F and a low of 51°F with a 11% chance of rain.

Historical Weather

Based on 13 years of data

Avg Temp

69°F

L:57° H:69°

RunScore

Conditions

Rain Freq

46%

6 of 13 yrs

Wind8mph

Dew52°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

Year	Low / High	Rain	Dew Point
2025 Tunnel Light Marathon Partly cloudy throughout the day. 2025	62°/68°	-	54°
2024 Tunnel Light Marathon Partly cloudy throughout the day. 2024	61°/73°	-	59°
2023 Tunnel Light Marathon Partly cloudy throughout the day. 2023	58°/79°	-	53°
2022 Tunnel Light Marathon Partly cloudy throughout the day. 2022	57°/72°	-	47°
2021 Tunnel Light Marathon Cloudy skies throughout the day with morning rain. 2021	57°/64°	Light	54°
2019 Tunnel Light Marathon Partly cloudy throughout the day with a chance of rain throughout the day. 2019	59°/61°	Light	56°
2018 Tunnel Light Marathon Partly cloudy throughout the day with rain clearing later. 2018	55°/63°	Light	50°
2017 Tunnel Light Marathon Partly cloudy throughout the day with rain. 2017	55°/65°	Light	51°
2016 Tunnel Light Marathon Partly cloudy throughout the day. 2016	55°/67°	-	53°
2015 Tunnel Light Marathon Partly cloudy throughout the day with morning rain. 2015	61°/66°	Light	55°
2014 Tunnel Light Marathon Clear conditions throughout the day. 2014	54°/83°	-	47°
2013 Tunnel Light Marathon Cloudy skies throughout the day with rain. 2013	59°/66°	Light	59°
2012 Tunnel Light Marathon Clear conditions throughout the day. 2012	53°/73°	-	52°