Mount Thomson

Mount Thomson is a mountain in the Cascades with steep rock formations located within the Mount Baker-Snoqualmie National Forest. The surrounding area features alpine landscapes with views across neighboring peaks and valleys.

The mountain was named after Reginald Heber Thomson, a Seattle city engineer who shaped the city's infrastructure. Its first recorded ascent took place in 1917 by mountaineers.

The United States Board on Geographic Names officially adopted the spelling 'Thomson' in 1981, correcting the previous spelling variation 'Thompson' used in regional documents.

The ascent via the East Ridge Route demands technical skills and proper gear due to steep and exposed sections. Visitors should bring experience with rock scrambling and safety techniques.

The pointed rock formations resemble the Matterhorn and make the mountain visually distinctive from surrounding peaks. These sharp ridges and towers are visible from many vantage points across the area.

Location: King County

Location: Washington

Elevation above the sea: 1,998 m

GPS coordinates: 47.47230,-121.36064

Latest update: December 14, 2025 20:04