Sunday, Apr 23, 2023
This Event Took Place Sun. Apr 23, 2023

Overview Solo Distances

The half marathon and marathon are good options if you want to run the race but aren't wanting to do an ultra. With the course cutoff time not being until 5pm, it is good for those that want to walk or run/walk the course.

The half marathon will have 6 full aid stations and a water station. The full marathon will have 8 full aid stations.

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 12 full aid stations. For 50K participants, there are 9 full aid 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.

Overview Relay

Want to try your first relay race? How about a relay that won’t keep you up all night? The Mt. Si Relay is great for first-timers, as well as for seasoned teams seeking a fun event without too many logistics. There are five people per team, with each team member running two legs of 3-8 miles. Your team of five can ride in one vehicle. Team categories are determined by total team age on race day, which allows flexibility in assembling your team. The Relay can be run with 6-10 Runners as a Recreational team that isn't eligible for awards. Runners will run between 1-2 legs depending on how many runners you have on your team.

Most of the 58-mile course is on the hard-packed Snoqualmie Valley Trail. The trail’s gentle grade is excellent for running with spectacular views. There are ten individual legs, with each team member running two. Exchanges are well-marked and manned by volunteers. Method of exchange is a simple touch off by hand.

Course Description

The course is on the Snoqualmie Valley Trail and John Wayne Pioneer Trail (Iron Horse State Park). The course provides views of the Cascade foothills and the Snoqualmie and Tolt Rivers. The 50-Mile course follows small town and rural roads from Snoqualmie, then north onto the trail, past Fall City and to the South edge of Carnation, where the runners turn around and run southeast to North Bend. At the 19.4 mile mark, in the town of Snoqualmie, the 50-Mile runners will be joined by the 50K runners and head to Rattlesnake Lake via the Snoqualmie Valley Trail and then to the Homestead Trailhead near Olallie State Park via the Palouse to Cascade Trail. Here they will make a U-turn at an aid station and head back to the finish at Snoqualmie Elementary School. The trail is old railroad grade. It has a gentle grade and is generally wide with some crushed rock and packed dirt. The steepest climb is from North Bend to Rattlesnake Lake, which is 450 feet over five miles. The half marathon and marathoners will run the same course to start with as the 50K runners but will turn around at the half way point for each distance.

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.

Event's current local time: 11:30 PM PT


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