The downhill Light at the End of the Tunnel course is a very fast course. However, running just over two miles through a tunnel and the trail surface (hard-packed gravel) may slow some runners a little. However, the move from a July race date to a June date in 2015 should result in faster times due to the more favorable temperatures (edited: 26.7% of finishers in 2015 ran Boston qualifying times compared to 14.7% in 2014).
From race website - The Light at the End of the Tunnel Marathon runs on a scenic, point-to-point, rail-trail course which descends 2050 feet in 26.2 miles from Snoqualmie Pass to North Bend.
The Light at the End of the Tunnel Marathon was the 149th largest marathon in the U.S. last year and was the 181st largest in 2014.
This year 27.4% of finishers qualified for the Boston Marathon and 26.7% of runners qualified for Boston in 2015.
This gives the Light at the End of the Tunnel Marathon the 12th highest percentage of Boston Marathon qualifiers in the U.S. last year and the 16th highest percentage so far in 2016.
Its Course Score of 104.37 ranks it as the 6th fastest marathon course in the U.S. and the 2nd fastest course in Washington.
The typical race time temperature and humidity levels are slightly above the ideal range for optimal marathon performance. This, coupled with the Course Score, gives the Light at the End of the Tunnel Marathon a PR Score of 103.61. This PR Score ranks it as the 7th fastest marathon in the U.S. and the 2nd fastest in Washington.
Learn more about PR Scores and Course Scores on the FAQ page.