Mount Thomson, Mountain summit in King County, United States
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 nearest higher peak is Chikamin Peak, 2.08 miles (3.35 km) to the east, while Alaska Mountain lies 0.81 miles (1.30 km) to the southeast. The summit stands half a mile east of the Cascade Range crest, and runoff from its slopes drains into the Middle Fork of the Snoqualmie River.
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