Mount Si

based on 8 tracks & routes #7 hike out of 64 in
6.3 mi
2 hrs 31 min
3,238 ft
Elev Gain


This is a difficult one way trail in Mount Si Natural Resources Conservation Area.

This trail goes by Mount Si.

This is an alternate route for Mount Si.

Sights to See

    Rate this Hike

Public Tracks

Nicholas Heilweil 6 years, 7 months ago
Rob: Mt. Si via Old Trail from Boulder Trail
This was our 2nd trip up Big Si, but our 1st up the Old Trail. 5 times harder than the main trail. Started out at Little Si Trailhead, and took the immediate fork onto Boulder Trail. We've done this loop before (twice) and love the peace & quiet of no other hikers. Amazing rock formations make for some great exploring here ! Near the top of Boulder, take the unmarked stone stairs up... this is the start of the Old Trail. It's a lot steeper than the new trail, and you'll feel it right away. It soon turns into a boot trail, and gets even steeper. If you've done Big Si before... this entire trail feels like the LAST 1/2 mile of the new trail. Get ready for an ass-kicking :0)
kevinmst 1 month, 4 weeks ago
MrHoff 10 months, 2 weeks ago