Tatoosh Peak is a 6,310-foot summit in Lewis County, Washington, and the highest point in the Tatoosh Wilderness. Rising in the Tatoosh Range within Gifford Pinchot National Forest, it drains into tributaries of the Cowlitz River. Its name comes from Chinook Jargon, where tatoosh means breast. The mountain’s environment reflects the marine west coast climate of the western Cascades, bringing heavy winter moisture, wet snow, and frequent avalanche conditions, while summers are often clearer. A fire lookout built on the summit in 1932 later helped give the peak a place in regional literature through Martha Hardy’s 1947 book Tatoosh. A spur from the Tatoosh Trail reaches the former lookout site.