The Dubuque Arboretum and Botanical Gardens 52 acres (210,000 m) are an arboretum and botanical gardens established in 1980 and located at 3800 Arboretum Drive, Dubuque, Iowa. It is open without charge seven days a week from May 1 to October 31, and weekdays the remainder of the year. The arboretum is the largest in the United States staffed entirely by volunteers, and over 375 people help maintain the gardens. The Arboretum is a popular spot in the community for outdoor weddings.