The 2021 Mt. Si Trail Races will be virtual
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State restrictions during the pandemic in 2020 forced cancellation of the Mt Si Relay and Trail Runs for the first time in 38 years. In 2021 the Mt Si Trail Runs will happen as virtual events. Runners are encouraged to run the traditional course on the beautiful Snoqualmie Valley Trail. Course maps of the race route are posted on this web site. All who register will receive a bib, shirt, and finisher’s medal. In addition there will be awards for the top finishers in each category/division for those who run the race on the mapped route any day between April 24 and May 9, inclusive.


Cost for any 2021 race is $30 for Eastside Runners club members and $40 for nonmembers. (Hint: You can join Eastside Runners for a year for just $20: Eastside Runners Club - Join us)

Packet Pickup


Results and awards

Results will be available as soon as possible after May 16 (the last day to submit results) on this website's results page. Awards will be mailed to the top finishers in each category/division that run on the mapped course within the specified dates. Any runner who completes the distance on a different route will be listed in official results but will not be eligible for awards. All finishers receive a unique Mt. Si Ultra medal. Direct any questions to

Event history

The event began as the “Falls to Gasworks Relay” in 1983, beginning at Mt. Si High School near Snoqualmie Falls and ending at Gasworks Park in Seattle. In 1999, the event was moved to the Snoqualmie Valley and was renamed the Mt. Si. Relay & Ultra Run. In 1999 the solo run was 52.1 miles, and in 2000 it was changed to a 50.0 miles. In 2003, a 50K solo run was added and the name was changed to Mt. Si Relay & Ultra Runs.

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