Walking through the arboretum

Hoyt Arboretum Friends (HAF) is a membership-based, nonprofit organization working in partnership with Portland Parks and Recreation to support Hoyt Arboretum.

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About Hoyt Arboretum


Established in 1928, Hoyt Arboretum is Portland’s museum of living trees where we grow and exhibit trees and plants from around the world while educating our community and conserving vitally important plant biodiversity.  

The arboretum is open free to the public and encompasses 189 ridge-top acres in Washington Park that are accessible by 12 miles of trails. Our collection nurtures 6,000 specimens from around the world, including over 2,000 species, 63 of which are vulnerable or endangered. To the local community, Hoyt Arboretum is an urban oasis for education and recreation. To the world, Hoyt Arboretum is a critical partner in scientific research and global conservation

Hoyt Arboretum is a living laboratory where the public, scientists and students can study trees and plants. Hoyt Arboretum is:

  • A unique collection of trees and plants from around the world
  • A living laboratory for preservation and research
  • A vital resource for conserving plant biodiversity
  • A sanctuary for 63 vulnerable and endangered species
  • A place to learn about trees and their relationship to the environment
  • A peaceful urban oasis
  • A 189-acre refuge with 12 miles of hiking trails
  • A promise to future generations

At Hoyt Arboretum, every tree has a story to tell. Tree collections are organized by taxonomy (plant families) and geography. Identification labels help you learn about trees that catch your interest.

The Hoyt collection includes more than 2,000 true species with specimens grown from seeds collected in the wild. The provenance, or lineage, of each tree is known. These plants produce seeds that can be used to replant native ecosystems that have been destroyed or are at risk. Archival vouchers (dried samples) for over 800 species can be researched in our herbarium.

Hoyt Arboretum is a promise to future generations. Just as we are enjoying mature, wonderful trees that were planted many years ago, the trees we plant today will provide myriad benefits to the environment, in-depth research opportunities and natural beauty for decades and centuries to come.

Hoyt Arboretum Friends
Mission Statement

To maintain and improve Hoyt Arboretum and its collection for all people through advocacy, resources, awareness and education.

Support Hoyt Arboretum by becoming a member