The Arboretum maintains one of the largest collections of maple species in the United States.
Azalea Way was originally designed by the Olmsted Brothers as part of a larger plan for Seattle's park system.
The park contains specimens from the CITES-listed Wollemia nobilis, a rare 'living fossil' conifer.
The grounds are built on reclaimed land that was historically shaped by glacial activity and later logging.
The Japanese Garden was designed in 1960 by landscape architect Juki Iida, who traveled from Japan to oversee construction.
The Arboretum features a dedicated 'Witt Winter Garden' specifically curated for seasonal interest during cold months.
Foster Island was once a site used by the Duwamish people for fishing and canoe transport.
The park's layout was influenced by the 'Seattle Park Boulevard' concept intended to create green corridors throughout the city.
The Arboretum has served as a field laboratory for University of Washington botany and forestry students for over 80 years.
The Washington Park Arboretum is a 230-acre living plant museum managed through a partnership between the University of Washington and the City of Seattle. It features one of the most comprehensive collections of woody plants in the Pacific Northwest, with over 10,000 trees and shrubs. The site serves as a vital wildlife corridor, providing habitat for migratory birds, beavers, and river otters along the Union Bay shoreline. The Japanese Garden, a 3.5-acre site located at the south end, is a distinct attraction requiring separate entry. Visitors can explore a network of paved and gravel trails, including the Azalea Way, a 0.75-mile path showcasing ornamental flowering shrubs. The grounds are divided into specialized plant collections, including a world-renowned oak collection and a significant maple grove. The Foster Island trail connects the park to the surrounding marshlands and Arboretum Bay. It functions as both a research site for the University of Washington and a public recreational space. The landscape design emphasizes native Pacific Northwest forest ecology alongside exotic botanical specimens.
The red wooden bridge within the Japanese Garden provides a quintessential view of the landscape design.
Use the 'Arboretum Explorer' web app to locate specific rare trees by their botanical names while walking.
Bring binoculars if visiting the Foster Island area to view active bird nesting sites.
Pack a picnic, as there are limited food facilities inside the park grounds.
Do not attempt to walk across the fragile marsh areas outside of designated boardwalks, as this damages sensitive wetland ecosystems.
The Japanese Garden remains closed annually during the winter months for maintenance and may have specific closures on Mondays depending on the season.
Leashed dogs are welcome on trails; remain on paths to protect delicate root systems and plant beds.
