Wind River Arboretum, established in 1912 by Thornton T. Munger of the United States Forest Service, is the Pacific Northwest’s oldest arboretum and a long-running forestry research site within the Wind River Experimental Forest near Carson, Washington. Foresters planted 165 tree species from temperate and subtropical regions to test their value for commercial forestry alongside native trees. Over more than 90 years, native species proved best adapted to local conditions, while most non-native trees died. The arboretum stands within an old-growth forest known for long-lived conifers, including Coast Douglas-fir and western hemlock, and it also preserves a section of the fallen Mineral Tree.