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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Upcoming Events & Classes

Fall Color Tour

Saturday, October 21
$3 suggested donation, HAF members free!

Just in time for peak fall color, enjoy a walk through the arboretum to see some incredible color! Join tour guide Ruth Williams for a walk through the arboretum to see our glorious maples, sumacs, tupelos, and sourwoods to name a few.

Registration is not required; please meet at the Visitor Center. 

Members-Only Fall Color Tour

Sunday, October 22

Enjoy a members-only guided tour through the arboretum with Curator Martin Nicholson to see the incredible color of the fall season! 

Registration is not required; please meet at the Stevens Pavilion. 

Saturday Crew - No Ivy Day

Saturday, October 28
Volunteer opportunity! 

Saturday Crew volunteers assist Hoyt Arboretum's horticulturist with trail maintenance, invasive species removal, special projects and more. Volunteers should come dressed for the weather and be prepared to get dirty in a pair of long pants and sturdy, closed toe shoes. Training, tools and gloves are provided; no previous experience is necessary. Registration is required. Please sign up here.

An Arborist's View of the Arboretum - Guided Tour

Saturday, October 28
$3 suggested donation, HAF members free!

Join professional arborist Logan Collier to learn about his unique perspective on Hoyt Arboretum's living tree collection.

Registration is not required; please meet at the Visitor Center.


Maple Collection & Seasonal Highlights - Guided Tour

Sunday, October 29
$3 suggested donation, HAF members free!

Do you love maple trees? Are you considering adding a maple tree to your yard? Did you know there are 128 species of maples and that Hoyt Arboretum's collection includes around 50 species? Come enjoy our amazing variety of maples and other seasonal highlights!

Registration is not required; please meet at the Visitor Center.


Mosses, Lichens and Liverworts

Wednesday, November 15
$15/member, $20/non-member

Mosses, lichens and liverworts are vitally ecologically important in sustaining the web of life. This is an opportunity to satisfy your curiosity about mosses, lichens and liverworts.

Participants will have an opportunity to learn about the biology, evolution, ecology, ethnobotanical uses and cultural anthropology of mosses, lichens and liverworts, as well as their role in fighting global climate change, improving urban air quality and as an integral member of the temperate rainforest ecosystems of the Pacific Northwest. Participants will also have an opportunity to learn some of the primary species found in and around Portland and an opportunity to identify and experience many of these species in the field.

About the instructor: Daniel Salomon holds a MA in Research as well as a Graduate Certificate in Science and Religion. His undergraduate work included biology and environmental studies. He is an accomplished author of six books on the environment. He is a Hoyt Arboretum citizen scientist, herbarium archive assistant and tour guide.

Workshop size is limited to 15 participants. Registration is required. Please sign up below via Paypal or call (503) 823-1649. 

Member / Non-Member


Broadleaf Evergreen Identification

Saturday, December 2
9am-12 pm
$15/member, $20/non-member

It's very common for people to use the term ‘evergreen’ to refer to only conifers, but this distinction isn't exactly accurate. Many genera of broadleaves, too, have a species that have opted to retain their leaves year-round. Oaks, madrones, magnolias, hollies, and others all have examples of evergreen species. In this course, we're going to focus on identification of some of these broadleaf evergreen species, and discuss how this evolutionary strategy works and why these trees are becoming more and more important in the face of climate change and urbanization.

About the instructor: Casey Clapp is an avid plant enthusiast and Certified Arborist who specializes in tree identification, risk and health assessment, and diagnostics. Currently, Casey works for the City of Portland as a Tree Inspector and previously has worked as a consulting arborist across the region. He holds a Bachelor of Science in Forest Management and a Master of Science in Environmental Conservation.

Limited to 15 people. $15/member, $20/non-member. Registration is required. Sign up below via Paypal or call call (503) 823-1649.

Member / Non-Member

History of Hoyt with Mary Houle

Saturday, December 2
Free presentation!

Join us for an afternoon presentation by local author, Marcy Houle, to learn about the history of Portland's museum of living trees, Hoyt Arboretum. Marcy will be available for book signing after the presentation.

About the speaker: Marcy Cottrell Houle is a professional wildlife biologist, national speaker, and award-winning author of four books, including One City's Wilderness. Marcy lives with her family on a farm on Sauvie's Island, near Portland. 

Winter Plant Identification

Saturday, December 9
$20/member, $25/non-member

Learn all about winter plant identification with instructor Ruth Williams. An indoor and outdoor workshop component will be included.

Part 1: Introduction to Winter Plant Identification, In-Classroom Instruction (9:30am-11:30am)

Have you ever gazed at the frost covered branches of a tree in winter and wondered, "What kind of tree is that?" It can be tricky to identify trees without their familiar leaves, flowers, and fruits. Join us to learn how to identify dormant trees based on twigs and other clues. The course will cover 10 common landscape trees such as ash, maple, and pear at the family level.

Part 2: Winter Plant Identification, Outdoor Interpretive Hike (12-2pm)

We will look at trees from a variety of families and how to tell one genus from another. Please dress warmly. 

About the instructor: Ruth Williams is an arborist and plant enthusiast with degrees in Horticulture and Landscape Architecture from UC Davis. She has conducted year-round inventories of over 100,000 urban trees over the past 7 years as a consulting arborist for the Davey Resource Group. She teaches botanical illustration and dormant plant ID at Hoyt. She lives in Southeast Portland with two heritage California bay Laurels, her husband, and seven chickens. 

Limited to 15 students. $20/member, $25/non-member. Registration is required. Sign up below via Paypal or call (503) 823-1649. 

Member / Non-Member
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