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Events


Mt. Si Relay

The relay part of the race has been canceled for 2018 due to projected trail closures next spring. We plan to have the relay back in 2019! Check out the half marathon, 20M, 50K or 50M solo distances!

Ultras

As with the relay, the ultra events are excellent venues for runners stepping up to a 50K or 50-mile distance for the first time. The trail is generally smooth without too much elevation, with very good support on the course.

For 50-milers there are six full aid stations and three mini food/water stations. For 50K participants, there are three full aid stations and two mini food/water stations. Of course everything that makes the ultras good for first-timers also makes it a fast and rewarding adventure for experienced ultra runners.

Categories are Open (under 40) and Masters (40+), for both men and women.

For detailed ultra information, see our Ultras page.

Half Marathon and 20 Mile

New this year the half marathon and 20 mile distances are good options for those that want to run the race but do not want to run a full ultra distance. The trail is generally smooth without too much elevation, with very good support on the course.

For half marathon participants, there are 2 full aid stations along the course. For 20 miler participants, there are 2 full aid stations along the course and a full aid station at the turn around point.

Categories are Open (under 40) and Masters (40+) for both men and women.

For detailed information, visit our half marathon page and 20 Miler page.

Packet Pickup

Packet pickup will be Saturday, April 28, from noon to 4 p.m. at Everyday Athlete,
11829 98th Ave. NE, Kirkland, WA 98034. 425-821-4301

Packets will include race shirts (if purchased), numbers and pins.

To limit paper waste, packets will NOT include driving directions, printed course descriptions, maps etc. We encourage runners to print necessary information from this website.

NOTE: Runners not showing up will forfeit their entry fees. Packet pickup is also available on race day near the starting line. Please arrive early if you choose this option.

Finish line

Refreshments will be available at the finish area. A limited number of shirts from this year and previous years will be for sale.

Results and awards

Results will be available as soon as possible after the race on this website's results page. Awards will be given to the top finishers in each category/division. All ultra finishers receive a unique Mt. Si Ultra medal. Awards not picked up at the event will be mailed. Direct any questions to info@mtsirelay.com

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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