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 gains up to the Rock Garden (SLOW). The 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 trophy and bragging rights. Custom designed Mount Si T-shirts and Medal of Courage for all finishers. Gatorade, water, gel, first aid will be 1.5 miles and 3.5 miles.

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.