Mission
THE ARBORETUM FOUNDATION PROMOTES, PROTECTS, AND ENHANCES THE WASHINGTON PARK ARBORETUM FOR CURRENT AND FUTURE GENERATIONS BY STRENGTHENING AND BUILDING A DIVERSE AND ENGAGED COMMUNITY OF DONORS, VOLUNTEERS, AND ADVOCATES.
Public Charity
ARBORETUM FOUNDATION
ARBORETUM FOUNDATION, of SEATTLE, WA, is a Public Charity tracked in Imperigo's IRS 990 database. The 2025 filing shows $7.9M in revenue, $3.6M in expenses, $14.4M in total assets. 116 publicly reported grants to this organization, totaling roughly $3.3M, appear in IRS filings.
EIN: 910613583
SEATTLE, WA
Single Organization Support
NTEE: C11
Latest filing: 2025
Total Revenue$7.9M
Total Expenses$3.6M
Total Assets$14.4M
Grant Records116
Funding Total$3.3M
Filing Years2021–2025
Where $100 goes at Arboretum Foundation
How Arboretum Foundation divides every $100 it spends, from its own Form 990 filings, averaged across 9 years.
$71
Programs
the work itself
$15
Management
running the organization
$14
Fundraising
raising the next dollar
Inside the $71 for programs
$33
More than 550 volunteers donated approximately 14,600 hours for the benefit of the arboretum during this fiscal year
$21
The foundation provides annual funding to the university of washington botanic gardens to support ongoing horticultural care and maintenance to the washington park arboretum
$11
Capital projects
Plus 1 more program. Cost per person served and the full program breakdown are on the full profile.
Source: Form 990 filings with the IRS, latest fiscal year 2025. Shares are from the organization's reported expenses. Data by Imperigo; not affiliated with the IRS.
Sample Grants Received
ENVIRONMENTAL AND ANIMALS
$109,298
CIVIC AND CULTURAL PROGRAMMING
$100,000
GENERAL SUPPORT
$47,226
GENERAL SUPPORT
$47,226
For grant recipient's exempt purposes
$36,800
Showing up to 5 of 116 total records — full history available with membership.
Officers & Directors
VICE PRESIDENT
Alissa Rupp
BOARD MEMBER
Barbara Jacobson
BOARD MEMBER
Barbara Wright
BOARD MEMBER
Bill Mcgee
ADVANCEMENT DIRECTOR
Clare Hausmann
BOARD MEMBER
Glenn Pinqul
Officer compensation and complete director data available with membership.
Top Grant Purposes
Financial Trends
| Year | Revenue | Expenses | Assets |
|---|---|---|---|
| 2025 | $7.9M | $3.6M | $14.4M |
| 2024 | $4.0M | $3.4M | $11.7M |
| 2023 | $4.8M | $2.9M | $10.4M |
| 2022 | $5.0M | $2.8M | $8.0M |
| 2021 | $2.5M | $1.9M | $6.8M |
Between 2021 and 2025, reported annual revenue grew from $2.5M to $7.9M (+220%), with total assets most recently reported at $14.4M.
Interactive year-over-year charts and full filing details available with membership.