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Community of Esteemed Arborists Advocating for the Highest Standards of Tree Care in St. Louis 

Registered Arborist Directory

Homeowners and businesses interested in professional tree care and landscape design can find trusted and insured arborists listed in the member directory.


What Is the St. Louis Arborist Association? 

Founded in 1955 by Ken Kirk, Ed Schrader, and John Haberthier, the St. Louis Arborist Association is a nonprofit organization dedicated to advancing the skills, knowledge, and integrity of tree care professionals in the St. Louis area. The goal is to establish a culture of cooperation and high standards of care so we can preserve the health and longevity of our trees and improve the quality, beauty, and value of our St. Louis landscapes.

What is a Certified Arborist?

Arborists are skilled tree care professionals trained in the art and science of planting, assessing, and maintaining the health and safety of trees. An arborist should be certified through one or more professional organizations. Certification provides a measurable assessment of an individual’s knowledge and competence regarding proper tree care. 


The basic accreditation for St. Louis Arborist Association professionals is certification through the International Society of Arboriculture (ISA). To be an ISA Certified Arborist, one must pass a comprehensive examination verifying they have knowledge in tree biology, safety, maintenance, planting, trimming and pruning, diagnosis, and other arboricultural standards. 


To maintain certification, a certified arborist must continue their education and stay up-to-date on the latest scientific and technical advances in arboriculture. All arborists who are certified by the ISA must adhere to the Society's Code of Ethics

Tree Planting
Forest Path

Our Mission at St. Louis Arborist Association 

We strive to elevate the standards of tree care in the St. Louis area, to foster a community of collaboration amongst members of the Association, and to increase public awareness about the advantages of working with qualified professional arborists who adhere to the latest industry standards. 

St. Louis Arborist Events

Monthly meetings are held on the 2nd Tuesday of each month unless otherwise noted. Check the calendar frequently for training and guest speaker events, tours, and volunteer opportunities.

No upcoming events at the moment
Arborist team planting a new tree together

Join the St. Louis Arborist Association

Interested in becoming a member of the St. Louis Arborist Association? Access an application via the website. The Association offers multiple different membership options, including Active, Contributing, Associate and Municipal. New members are “probationary” members until an Ethics review has been completed. Applicants interested in “Active” membership must include references.

Tree Care and
Arboriculture Resources

Learn more about tree care, maintenance, pests and diseases, and the role of professional arborists in preserving St. Louis’ trees. These quick-read articles highlight timely and locally focused information to help you make informed decisions about caring for your trees.

Each month, the Association publishes a new article. Check the site regularly to stay up-to-date or subscribe for email updates.

Forest Sunrays

Branch Out and Contact Us!

Use our online contact form to reach out to us.

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