The Iowa Arboretum (378 acres) is a nonprofit arboretum located at 1875 Peach Avenue, Madrid, Iowa. It is open daily sunrise to sunset.
The arboretum was organized in 1966 by the Iowa State Horticultural Society on the society's 100th anniversary. Its mission is to grow, display, identify and study plants for education, research, conservation, esthetics, and for personal enjoyment and recreation.
The arboretum contains hundreds of species of trees, shrubs, and flowers arranged in 19 collections (40 acres) as follows: Butterfly Garden, Children's Garden, Columnar Trees, Conifers, Dwarf Garden, Flowering Trees, Founders Grove, Herbs, Hostas, Large Deciduous Trees, Medium Deciduous Trees, Nut Trees, Perennials, Shade Garden, Shrubs, Trees under Utility Wires, Wetland Trees, Windbreak, and Winter Interest. In addition, the arboretum contains more than 300 acres (1.2 km2) of native timber with woodland trails, ravines, and streams. It accepts donations.