Mount Si, Mountain summit in King County, United States.
Mount Si rises to 4,167 feet above sea level, with the main trail stretching 8 miles round trip through dense forest and rocky terrain.
The mountain received its name from Josiah Merritt, a local homesteader known as Uncle Si, who settled in the Snoqualmie Valley during the 1800s.
The Snoqualmie people tell stories of Mount Si as the body of sɬukʷalb, a paramount deity figure in their traditional religious narratives.
The trail gains 3,150 feet in elevation and requires sturdy hiking boots, water supplies, and approximately 4-6 hours to complete the round trip.
The summit area features the Haystack, a class 3 rock formation that demands technical climbing skills to reach the absolute peak.
Location: King County
GPS coordinates: 47.50696,-121.73911
Latest update: May 27, 2025 11:43
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