Mount Si Old Trail


Day Hike - Mount Si Old Trail

Moderately-paced conditioner day hike up Mount Si using the Old Trail.

COVID-19: Learn about our most up-to-date guidance for participants and leaders on our COVID-19 Response page. All participants and leaders must agree to the COVID-19 Code of Conduct before participating in this Mountaineers activity.
  • Strenuous
  • Moderate
  • Mileage: 7.0 mi
  • Elevation Gain: 3,300 ft

Little Si Trailhead at 10am. (Not the Mount Si Trailhead). The trailhead is at the 2nd parking lot after the bridge on Mt. Si Road. The two parking lots are very close together.  There is a restroom by the trailhead in the main parking lot -- we are meeting here.  If this main (2nd as you drive in) parking lot is full, drive back to the first parking lot (the overflow lot) and walk from there to the trailhead parking lot on the connecting trail/pathway.  The Mt. Si Road is reached by exiting I-90 at 436th Ave SE (exit 32), turning left (north) at the end of the exit, continuing to the T junction, where you turn left (west) and then turn right (north) in a short distance onto the Mt. Si Road.  A Discover Pass must be displayed in each car parked at the trailhead. Please be on-time.  An email will go out 1 day ahead of the hike for those wishing to coordinate carpooling.

This will be a moderately paced conditioner hike, so we will not be running up or running down but will be keeping a steady pace with very quick stops for water and snacks.  This is not a beginner's hike.  The terrain has some steeper, rooted sections, so participants need to be sure-footed. Microspikes and poles required. 


Mount Si Old Trail

Required Equipment

Required Equipment

The Ten Essentials

  1. Navigation
  2. Sun protection
  3. Insulation (extra clothing)
  4. Illumination
  5. First aid supplies
  6. Fire
  7. Repair kit and tools, including knife
  8. Nutrition (extra food)
  9. Hydration (extra water)
  10. Emergency shelter
  11. Microspikes
  12. trekking poles
Trip Reports