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Race Overview
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.
WikipediaFAQ
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 Qualfier?
Yes, the Tunnel Light Marathon is an official Boston Marathon qualifier.
Tunnel Light Marathon Weather History
Tunnel Light Marathon Weather Averages
Average Temp: 63°, Average Low: 56°, Average High: 71°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 58° | 59° | 61° | 62° | 65° | 66° | 68° | 69° |
| Feel | 58° | 59° | 61° | 62° | 65° | 66° | 68° | 69° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 5mph | 6mph | 7mph | 8mph | 9mph | 9mph | 9mph | 8mph |
| Dew | 53° | 54° | 54° | 53° | 53° | 52° | 52° | 52° |
| RunScore |  | | | | | | | |
Tunnel Light Marathon 2025
Sep 14, 2025
Partly cloudy throughout the day.
Low: 61°, High: 68°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  65° | 65° | 63° | 62° | 63° | 65° | 67° | 68° |
| Feel | 65° | 65° | 63° | 62° | 63° | 65° | 67° | 68° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 10mph | 9mph | 10mph | 13mph | 14mph | 14mph | 15mph | 15mph |
| Dew | 55° | 56° | 56° | 54° | 53° | 52° | 52° | 51° |
| RunScore | | | |  | | | | |
Tunnel Light Marathon 2024
Sep 8, 2024
Partly cloudy throughout the day.
Low: 61°, High: 75°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 61° | 61° | 61° | 63° | 64° | 67° | 70° |  73° |
| Feel | 61° | 61° | 61° | 63° | 64° | 67° | 70° | 73° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 5mph | 7mph | 6mph | 8mph | 7mph | 8mph | 7mph | 6mph |
| Dew | 58° | 58° | 58° | 58° | 60° | 61° | 61° | 61° |
| RunScore |  | | | | | | | |
Tunnel Light Marathon 2023
Sep 10, 2023
Partly cloudy throughout the day.
Low: 56°, High: 81°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 58° | 62° | 67° | 71° | 73° | 75° | 77° | 79° |
| Feel | 58° | 62° | 67° | 71° | 73° | 75° | 77° | 79° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 7mph | 6mph | 7mph | 7mph | 6mph | 8mph | 10mph | 11mph |
| Dew | 53° | 53° | 54° | 52° | 52° | 53° | 52° | 52° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2022
Sep 18, 2022
Partly cloudy throughout the day.
Low: 56°, High: 73°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 57° | 59° | 61° | 64° | 66° | 69° | 70° | 72° |
| Feel | 57° | 59° | 61° | 64° | 66° | 69° | 70° | 72° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 8mph | 9mph | 11mph | 9mph | 8mph | 12mph | 11mph | 9mph |
| Dew | 48° | 48° | 48° | 48° | 47° | 46° | 46° | 46° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2021
Sep 12, 2021
Cloudy skies throughout the day with morning rain.
Low: 57°, High: 66°, Light Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp |  59° | 58° | 57° | 57° | 58° | 60° | 62° | 64° |
| Feel | 59° | 58° | 57° | 57° | 58° | 60° | 62° | 64° |
| Rain | light | - | - | - | - | - | - | - |
| Wind | 2mph | 8mph | 8mph | 8mph | 8mph | 6mph | 5mph | 5mph |
| Dew | 57° | 56° | 55° | 54° | 54° | 53° | 53° | 53° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2019
Sep 15, 2019
Partly cloudy throughout the day with a chance of rain throughout the day.
Low: 57°, High: 62°, Moderate Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 60° | 60° | 59° | 59° | 60° | 60° | 61° | 61° |
| Feel | 60° | 60° | 59° | 59° | 60° | 60° | 61° | 61° |
| Rain | light | light | light | light | light | light | - | - |
| Wind | 7mph | 8mph | 10mph | 10mph | 7mph | 7mph | 8mph | 8mph |
| Dew | 57° | 57° | 55° | 56° | 56° | 54° | 55° | 55° |
| RunScore | | | |  | | | | |
Tunnel Light Marathon 2018
Sep 16, 2018
Partly cloudy throughout the day with rain clearing later.
Low: 55°, High: 65°, Moderate Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 55° | 56° | 56° | 59° | 63° | 61° | 63° | 63° |
| Feel | 55° | 56° | 56° | 59° | 63° | 61° | 63° | 63° |
| Rain | light | - | light | - | - | - | - | - |
| Wind | 8mph | 6mph | 11mph | 11mph | 14mph | 12mph | 13mph | 11mph |
| Dew | 52° | 51° | 53° | 50° | 52° | 48° | 48° | 48° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2017
Sep 17, 2017
Partly cloudy throughout the day with rain.
Low: 55°, High: 65°, Moderate Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 55° | 57° | 61° | 62° | 65° | 64° | 64° | 59° |
| Feel | 55° | 57° | 61° | 62° | 65° | 64° | 64° | 59° |
| Rain | - | - | - | - | - | - | - | light |
| Wind | 7mph | 10mph | 10mph | 10mph | 11mph | 11mph | 10mph | 5mph |
| Dew | 49° | 50° | 51° | 51° | 51° | 49° | 52° | 54° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2016
Sep 18, 2016
Partly cloudy throughout the day.
Low: 54°, High: 68°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 55° | 58° | 60° | 61° | 63° | 64° | 66° | 67° |
| Feel | 55° | 58° | 60° | 61° | 63° | 64° | 66° | 67° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 4mph | 8mph | 6mph | 8mph | 9mph | 7mph | 9mph |
| Dew | 54° | 55° | 53° | 53° | 52° | 52° | 53° | 52° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2015
Sep 13, 2015
Partly cloudy throughout the day with morning rain.
Low: 59°, High: 70°, Light Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 61° | 61° | 61° | 61° | 63° | 64° | 65° | 66° |
| Feel | 61° | 61° | 61° | 61° | 63° | 64° | 65° | 66° |
| Rain | - | light | light | light | - | - | - | - |
| Wind | 4mph | 2mph | 7mph | 7mph | 9mph | 9mph | 7mph | 5mph |
| Dew | 58° | 58° | 58° | 56° | 56° | 52° | 52° | 51° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2014
Sep 14, 2014
Clear conditions throughout the day.
Low: 51°, High: 84°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 54° | 60° | 65° | 69° | 74° | 78° | 81° | 83° |
| Feel | 54° | 60° | 65° | 69° | 74° | 78° | 80° | 81° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 2mph | 1mph | 3mph | 6mph | 6mph | 8mph | 9mph | 8mph |
| Dew | 48° | 49° | 51° | 49° | 47° | 44° | 44° | 43° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2013
Sep 15, 2013
Cloudy skies throughout the day with rain.
Low: 59°, High: 66°, Moderate Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 59° | 60° | 61° | 62° | 63° | 64° | 65° | 66° |
| Feel | 59° | 60° | 61° | 62° | 63° | 64° | 65° | 66° |
| Rain | - | - | light | - | - | - | - | - |
| Wind | 1mph | 4mph | 1mph | 3mph | 7mph | 8mph | 5mph | 7mph |
| Dew | 57° | 57° | 58° | 59° | 60° | 60° | 60° | 60° |
| RunScore | | | | | | | | |
Tunnel Light Marathon 2012
Sep 16, 2012
Clear conditions throughout the day.
Low: 51°, High: 74°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 53° | 55° | 61° | 63° | 67° | 68° | 71° | 73° |
| Feel | 53° | 55° | 61° | 63° | 67° | 68° | 71° | 73° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 2mph | 6mph | 5mph | 3mph | 5mph | 8mph |
| Dew | 49° | 50° | 51° | 52° | 53° | 53° | 53° | 53° |
| RunScore | | | | | | | | |