Cooper Mountain Nature Park is a 231 acres nature park in the Portland metropolitan area in the U.S. state of Oregon. Opened in 2009, the park is owned and operated by Metro, the regional government in the Oregon portion of the metro area. The park is named after Cooper Mountain, the primary geological feature in the area near Beaverton. Maintained by the regional Tualatin Hills Park and Recreation District, the natural area has 3.5 miles of hiking trails.