The Hoyt Arboretum is part of Washington Park in Southwest Portland. It is open daily from 6am - 10pm. There are over 1000 species of trees and plants located in 187-acre refuge. The Arboretum has 21 different trails, covering 12 miles. The Arboretum is named after Ralph Warren Hoyt, a county commissioner that championed the creation of the arboretum.