A strenuous, 7 mile hike with 3,300 ft in elevation gain. The trail features part of the Boulder Garden Loop, a steep old trail for a good workout and views of the Upper Snoqualmie Valley and Puget Sound. At the top consider an excursion to Blowdown Mountain, Crater Lake Mountain, or Dixie Peak.
Day Hike - Mount Si Old Trail — The Mountaineers
Mount Si Old Trail April 30, 2017 - CommuniChi
Hiking Mount Si: Lessons Learned – Heather's Compass
Alpine Scramble - Mount Si Old Trail — The Mountaineers
View topic - Mount Si (Haystack) - 5.20.2013
Mount Washington – Ellinor Traverse 08-27-2021 - Hiking with Hadland
Mount Si Hiker Information and Tips - North Bend Escapes
Mount Si - Old Trail — Washington Trails Association
Alpine Scramble - Mount Si Old Trail — The Mountaineers