Magnolia blossoms

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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Volunteering at Hoyt Arboretum

Volunteers play a very important role in helping Hoyt Arboretum grow. Opportunities are available in community science, education, stewardship, and visitor services, as well as project- and skills-based roles. Please review the list of current openings, or contact or (503) 823-1649 to learn more about the full range of opportunities. You can also complete the volunteer interest form below. 

Continue reading below for additional information about our volunteer programs. 

Volunteer Interest Form

 Project BudBurst
 Invasive Rubus Community Science Project
 Arboretum Naturalist
 Tuesday Crew (Year-Round, 8am-12pm)
 Saturday Crew (Seasonal, 9am-12pm)
 Schedule a Group/Corporate Volunteer Crew
 Trail Rover
 Website (Wordpress) | Digital Communications
 Other (Board/Committee/Project-Based)

Volunteer Programs at Hoyt Arboretum

Community Science

  • Herbarium Archivist: Create plant vouchers to document Hoyt Arboretum's tree collection
  • Invasive Rubus Community Science Project: Collect data in select Portland parks and natural areas to document the presence of non-native Rubus (blackberry) species
  • Project BudBurst: Collect data for a nationwide, community science-driven study of plant responses to changes in climate


  • Arboretum Naturalist: Lead field trips to introduce children to the science of trees through fun hands-on activities
  • Tour Guide: Lead interpretive tours to introduce visitors to Hoyt Arboretum, its tree and plant collections, and the arboretum’s role in global conservation
  • Workshop Instructor: Teach a class in our outdoor living classroom


  • Tuesday Crew: Maintain the arboretum's trees and trails year-round with the Tuesday Crew 
  • Saturday Crew: Maintain the arboretum's trees and trails with the Saturday Crew, scheduled seasonally from April through October
  • Group and Corporate Volunteering: Schedule a volunteer opportunity for your group or company

Visitor Services

  • Trail Rover: Hoyt Arboretum's ambassadors on the trail
  • Visitor Services Representative: Oversee the Visitor Center and engage with guests to provide recommendations for their visit to the arboretum

Volunteers also support many other program areas, including administration and database management, outreach, photography, social media, and special events, as well as serving on committees and the board of directors.

Volunteer Training Opportunities

Arboretum Naturalists

Become an Arboretum Naturalist at Hoyt Arboretum! Arboretum Naturalists are volunteer educators who lead field trips for children (grades K-8) to introduce them to the science of trees and Pacific Northwest ecology through fun hands-on activities.

Arboretum Naturalists lead small groups of students on a 90-minute field trip along the arboretum’s trails to inspire curiosity and discovery in the natural world. Field trips are typically scheduled on weekdays between 10am and 1pm. Arboretum Naturalists should be available to volunteer for a minimum of 2 tours per month during the peak field trip season.

No experience is necessary; training is provided. Volunteers with a love of the outdoors and an interest in environmental education are encouraged to apply (all volunteers must pass a background check). Gain valuable experience working with children and teaching environmental education in an outdoor setting.

Both training sessions are now full. For more information or to sign up for future training opportunities, please email or call (503) 823-1649. 

Invasive Rubus Community Science Project

New volunteer opportunity! Non-native Rubus (blackberry) is widespread in the Pacific Northwest and causes negative impacts to native habitats. This new community science project, led by Hoyt Arboretum staff, will survey the presence of four non-native Rubus species in select Portland parks and natural areas throughout the city. The research will help with the early detection of a relatively new invader to northern Oregon, Rubus vestitus, and inform invasive Rubus management and control strategies. 

A training session for Invasive Rubus Community Science volunteers is scheduled for Thursday, April 12 from 10-11am. During this training, volunteers will learn to identify the four invasive Rubus species, choose their assigned parks or natural areas, and learn to collect data and record their observations. For more information or to sign up, please email or call (503) 823-1649. 

Stewardship Volunteers

Volunteer at Hoyt Arboretum this Arbor Month!

While many places celebrate Arbor Day and Oregon celebrates Arbor Week, at Hoyt Arboretum we celebrate our global collection of trees throughout the entire month of April. Help to spruce up the arboretum's trees and trails with a variety of hands-on stewardship projects throughout the month. No previous experience is required; training, tools and gloves are provided. 

Join us at Hoyt for one - or more! - of these volunteer crews: Saturday, April 7, 9am-12pm, Friday, April 20, 9am-12pm (Earth Day crew), Friday, April 27, 9am-12pm (Arbor Day crew), Saturday, April 28, 9am-12pm. 

For more information, please contact or (503) 823-1649. Sign up to volunteer here.

Hoyt Arboretum's Tuesday Crew was featured on an episode of Oregon Field Guide. See our volunteers in action during this great video segment!


To sign up to volunteer for Tuesday Crew, please email

To sign up to volunteer for Saturday Crew, register online here


Current Openings

Arbor Month: Help to spruce up the arboretum's trees and trails with a variety of hands-on stewardship projects during April, including volunteer crews for Earth Day and Arbor DaySign up here

Community Science: Participate in Project BudBurst, a nationwide, community science-driven effort to study plant responses to changes in climate. Please email for next training session. Flexible schedule

Community Science: Participate in a new Invasive Rubus Community Science Project and collect data in select Portland parks and natural areas to document the presence of non-native Rubus (blackberry) species. Next training is scheduled on Thursday, April 12. Flexible schedule.

Education: Become an Arboretum Naturalist and lead field trips to introduce children to the science of trees through fun hands-on activities. Next training is scheduled on Monday, February 12 (FULL) or Thursday, February 15 (FULL).

Stewardship: Help care for the arboretum’s tree and plant collection and trail system. Volunteer crews are scheduled every Tuesday from 8am-12pm year-round (Tuesday Crew) and typically two Saturdays per month from 9am-12pm from April through October (Saturday Crew). Group and corporate volunteer opportunities are also available. 

Visitor Services: Become a Trail Rover and volunteer as an ambassador on the arboretum's trails; walk the trails to make contact with visitors to answer questions, give directions and share special points of interest. Please email for next training session. Flexible schedule.

Website | Digital Communications: Do you have experience with Wordpress, website content management or writing content for digital communications? One to two volunteer positions are available for the spring/summer. Flexible schedule

Volunteer opportunities are also available for individuals interested in leadership roles (board and committee), storytelling, and project-based opportunities. 

To learn more, please email volunteer@hoytarboretum.orgcall (503) 823-1649 or submit the volunteer interest form on this page. 

Thank you for helping Hoyt Arboretum grow!

Group or Corporate Volunteering

Volunteering is a great way for your group or company to learn more about one another, build camaraderie, and become better community members. There is always a place for your group or team to learn, play, and volunteer at Hoyt Arboretum!

Group volunteers have a unique opportunity to care for rare and unusual trees and plants from around the world with projects that can include trail work, pruning, weeding, mulching, and removing invasive species. Opportunities are available year-round and take place rain or shine! Gloves and tools are provided. 

If you're interested in a group volunteer opportunity, please email or call (503) 823-1649 with your group size, preferred dates and times. At least 3 weeks advanced notice is appreciated. Tuesday, Thursday and Friday mornings (9am-12pm) usually work best. Your group is also welcome to join our Saturday Crew or one of our stewardship days. Visit the Events page for more details.