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The City of Portland, Oregon

Portland Parks & Recreation

Healthy Parks, Healthy Portland

Phone: 503-823-7529

1120 SW Fifth Avenue, Portland, OR 97204

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Volunteer Roles

Portland tree inventory volunteers, join us

There are a number of ways to get involved with the Tree Inventory Project, and we welcome experts and novices alike. Read below to find the right role for you.

1. Team Leader

Team Leaders are responsible for data collection on inventory work days, acting as experts in tree identification, and leading volunteers in data collection. Team Leaders are also the public face of the Tree Inventory Project, educating the public about the program and the importance of community trees. No experience is necessary - Team Leaders will learn all they need by attending a two-part training prior to leading volunteers in the field. 


  • Attend at least three inventory work days.
  • Lead novice volunteers on work days to map, measure, and identify park trees.
  • Ensure that data collected is correct and complete.
  • Answer questions of the public about the Tree Inventory Project.
  • Understand and promote the community benefits of trees.

2. Data Collector: Help collect data during an inventory work day

Volunteers are needed to help collect data on inventory work days. Work days are held Wednesdays and Saturdays from June through September. Saturday work days occur from 8:30 am to noon; Wednesday work days are evening events, beginning at 4:30 pm. No experience is necessary, as novice volunteers will be paired with a Team Leader to identify trees and explain the inventory protocol. Duties include measuring trees, recording data on trees and the site, and mapping trees. Advanced registration via the website is requested. View our data collection protocol here.

3. Arborist-on-Call

Certified Arborists, horticulturists, or other tree care professionals with excellent tree identification skills work as Arborists-on-Call during inventory workdays. Arborists-on-Call check in with inventory teams to problem solve and answer questions about tree identification, condition assessment, and other questions that may arise. Volunteers typically use bikes or travel on foot between teams, and answer questions via text as well. Advance registration is required and a training guide is provided.

4. Tree Team Member

In addition to collecting tree data, volunteer Tree Teams in each neighborhood are responsible for proposing a park to inventory, advertising, and recruiting volunteers. Existing and new Tree Teams work with their communities to create and carry out neighborhood tree plans to steward the neighborhood’s tree canopy. If you are looking for a long term commitment to improve your neighborhood’s urban forest, joining the Tree Team may be for you.