Be the first up to the top of Mount Si in 2026! Join us for the Race to the Top of Mount Si. 3.7 miles of grueling mountain terrain 4,167 feet Elevation gain up to the Rock Garden. Race starts promptly at 9 am. Do you have the courage to take on The Mount Si Challenge! Grab a running buddy take the pledge conquering the Mount Si! Fastest up the Mountain receives the Golden Si Award. Top finishers receive gift cards and bragging rights. Age group ribbons and custom designed Mount Si T-shirts and Medal of Courage for all finishers. Gatorade, water, gel, first aid will be at the top and half point.

Register today at SammamishRunning.com

Elevation Gain 4,167’ – 3.7 miles

Event details and schedule

There is plenty parking at the Mount Si Trailhead. You must have Discover Pass $15/day or $45/year. Race starts promptly at 9 am.