Treeline Foundation concentrates its giving locally in the Seattle area and channels support almost exclusively to the YMCA of Greater Seattle. Grants are unrestricted/general operating in nature, indicating a preference for strengthening established community service infrastructure—particularly youth, family, health, and recreation programs. The foundation appears focused on sustaining a single regional partner rather than spreading funds across many organizations.
Treeline Foundation’s recent giving is defined by repeated support for the YMCA of Greater Seattle, including three straight annual grants of $110,000 from 2023 through 2025 and added support in 2025 for the Social Impact Center. That pattern points to a funder that backs existing community infrastructure rather than one-off projects. Across its grantmaking, the foundation also supports Seattle-area organizations working in youth development, outdoor access, climate, and social services, with several grants written as general operating support. Named recipients include Washington Trails Association, Sightline Institute, and Forterra, each appearing multiple times in the recent grant list. The grants often sit at the $100,000 level for core support, alongside smaller awards for program-specific work. Treeline Foundation also extends beyond a single institution through support for organizations connected to outdoor recreation and public benefit, such as The Sierra Club Foundation and The Wilderness Society. The overall picture is of a regional funder that uses unrestricted or broadly flexible grants to help established nonprofits sustain ongoing services, advocacy, and programming.
A clear theme in Treeline Foundation’s portfolio is outdoor access and recreation. In 2025, it gave $100,000 to Washington Trails Association for general operating support, with special interest in the OLT program, and also supported The Sierra Club Foundation with $75,000 for Outdoors for All. Climate work is another visible area: Sightline Institute received $100,000 in 2024 and again in 2025 to support efforts to address climate change. The foundation also backed conservation and land-use organizations, including Forterra, which received $100,000 in 2023 and 2024 for general operating support and $50,000 in 2025 for the same purpose. Social services appear as well through Northwest Abortion Access Fund, which received $65,000 in 2023 and 2024 for a program manager salary and operating support, then $65,000 in 2025 for general operating support.
Treeline Foundation’s typical grant size sits at $10,000 at the 25th percentile, $20,000 at the median, and $25,000 at the 75th percentile, even though the recent grant list also includes larger recurring awards at $100,000 and $110,000. The pattern is repeated support for the same organizations across multiple years, especially in Seattle and the broader region. Most awards are general operating support, with some program-specific operating support or salary support. Treeline Foundation is a regular funder rather than a donor-advised fund, funds individuals is false, and it does not make program-related investments.
$1.1M
$750K
$1.1M
$1.2M
Most grants fall between $10K and $25K, with a median of $20K.
25th Percentile
$10K
Median
$20K
75th Percentile
$25K
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Highly concentrated giving: multiple grants (repeat funding) to a single large regional nonprofit; mid-sized total giving devoted to one core partner rather than distributed among many recipients.
Notable grantees: YMCA of Greater Seattle
Treeline Foundation’s grants land overwhelmingly in the United States, with 136 grants there in the recent dataset. Seattle is the main recipient city, including multiple awards to YMCA of Greater Seattle, Washington Trails Association, Sightline Institute, Forterra, Zeno, Earthgen, and Seattle Shakespeare Company. Portland and Eugene also appear through Northwest Abortion Access Fund. Outside Washington, the foundation’s recent grants include organizations in Oakland, Boston, Minneapolis, Washington, DC, and Los Angeles, but the overall distribution remains strongly regional.
The foundation backs community service, outdoor access, climate, and social-service work. Recent grants include general operating support for YMCA of Greater Seattle, Washington Trails Association, Forterra, and Sightline Institute, plus program-specific support for Outdoors for All and a youth wilderness program.
Yes. Many of the recent grants are written as general operating support, including recurring awards to YMCA of Greater Seattle, Washington Trails Association, Sightline Institute, Forterra, Zeno, Earthgen, and Seattle Shakespeare Company. Some grants also include program-specific or salary support.
The foundation’s grant-size distribution is $10,000 at the 25th percentile, $20,000 at the median, and $25,000 at the 75th percentile. The recent grants list also shows larger awards of $100,000 and $110,000 to a few recurring partners.
Yes. Several organizations appear across multiple years in the recent grant list, including YMCA of Greater Seattle from 2023 through 2025, Washington Trails Association from 2023 through 2025, Sightline Institute from 2023 through 2025, and Forterra from 2023 through 2025.
The giving is regional, with 70% of grants going to recipients in Washington. Seattle recipients appear most often in the recent grant list, while other grants go to Oregon, California, Massachusetts, Minnesota, Washington, DC, and other US locations.
2025
Source: IRS Form 990-PF, fiscal year 2025.
Most recent grants reported to the IRS.
| Recipient | Location | Amount | Year | Purpose |
|---|---|---|---|---|
| YMCA OF GREATER SEATTLE | SEATTLE, WA | $110,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT AND SUPPORT OF THE SOCIAL IMPACT CENTER |
| WASHINGTON TRAILS ASSOCIATION | SEATTLE, WA | $100,000 | 2025 | GENERAL OPERATING SUPPORT, WITH SPECIAL INTEREST IN OLT PROGRAM |
| SIGHTLINE INSTITUTE | SEATTLE, WA | $100,000 | 2025 | TO SUPPORT EFFORTS TO ADDRESS CLIMATE CHANGE |
| THE SIERRA CLUB FOUNDATION | OAKLAND, CA | $75,000 | 2025 | TO SUPPORT OF THE OUTDOORS FOR ALL PROGRAM |
| 350ORG | BOSTON, MA | $75,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| NORTHWEST ABORTION ACCESS FUND | PORTLAND, OR | $65,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| FORTERRA | SEATTLE, WA | $50,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| FRESH TRACKS | WASHINGTON, DC | $25,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| EARTHGEN | SEATTLE, WA | $25,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| BENEFITS LAW CENTER | SEATTLE, WA | $25,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| THE TRUST FOR PUBLIC LAND | LOS ANGELES, CA | $25,000 | 2025 | GENERAL OPERATING SUPPORT IN TPL'S SEATTLE REGION |
| ZENO | SEATTLE, WA | $25,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| SEATTLE SHAKESPEARE COMPANY | SEATTLE, WA | $25,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| SOLID GROUND | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| CASA LATINA | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| NATIONAL AUDUBON SOCIETY | NEW YORK, NY | $20,000 | 2025 | TO SUPPORT OF AUDUBON WASHINGTONS SEWARD PARK CENTER |
| YOUTHCARE | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| PACIFIC SCIENCE CENTER | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| ISLANDWOOD | BAINBRIDGE ISLAND, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| MARY'S PLACE | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| PLYMOUTH HOUSING GROUP | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| YWCA SEATTLE KING SNOHOMISH | SEATTLE, WA | $20,000 | 2025 | TO SUPPORT OF WOMEN EXPERIENCING HOMELESSNESS |
| DESC | SEATTLE, WA | $20,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| AMERICAN ALPINE CLUB | GOLDEN, CO | $15,000 | 2025 | GENERAL OPERATING SUPPORT, WITH SPECIAL INTEREST IN REACHING YOUNGER AND MORE DIVERSE CLIMBERS |
| THE VERA PROJECT | SEATTLE, WA | $15,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| DEFINE AMERICAN | LOS ANGELES, CA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| THE 5 GYRES INSTITUTE | SANTA MONICA, CA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| NORTHWEST CHOIRS | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| SEATTLE SYMPHONY | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| RAINIER VALLEY CORPS | SEATTLE, WA | $10,000 | 2025 | TO SUPPORT THE AGEUP PROGRAM |
| SEATTLE REPERTORY THEATRE | SEATTLE, WA | $10,000 | 2025 | TO SUPPORT OF THE PUBLIC WORKS PROGRAM |
| SEATTLE GIRLS SCHOOL | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| THE MOUNTAINS TO SOUND GREENWAY TRUST | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| A CONTEMPORARY THEATRE | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| NORTHWEST FILM FORUM | SEATTLE, WA | $10,000 | 2025 | TO SUPPORT THE ULTIMATE CITIZENS VIDEO |
| NORTHWEST OUTWARD BOUND | PORTLAND, OR | $10,000 | 2025 | TO PROVIDING GENERAL OPERATING SUPPORT OF PROGRAMMING IN MAZAMA, WA |
| SAWHORSE REVOLUTION | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| TOTEM STAR | SEATTLE, WA | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| BIRDS CONNECT SEATTLE | SEATTLE, WA | $10,000 | 2025 | TO SUPPORT OF YOUTH EDUCATIONAL PROGRAMMING |
| CRISIS TEXT LINE | NEW YORK, NY | $10,000 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| THE MOUNTAINEERS | SEATTLE, WA | $10,000 | 2025 | TO SUPPORT THE MOUNTAIN WORKSHOPS PROGRAM |
| CATAWBA COLLEGE | SALISBURY, NC | $3,333 | 2025 | IN SUPPORT OF GALS PROGRAM |
| NEW MEXICO STATE UNIVERSITY | LAS CRUCES, NM | $3,333 | 2025 | TO PROVIDE GENERAL OPERATING SUPPORT |
| UNIVERSITY OF ARIZONA | TUCSON, AZ | $3,333 | 2025 | IN SUPPORT OF GALS PROGRAM |
| YMCA OF GREATER SEATTLE | SEATTLE, WA | $110,000 | 2024 | TO PROVIDE GENERAL OPERATING SUPPORT |
| FORTERRA | SEATTLE, WA | $100,000 | 2024 | TO PROVIDE GENERAL OPERATING SUPPORT |
| SIGHTLINE INSTITUTE | SEATTLE, WA | $100,000 | 2024 | TO SUPPORT EFFORTS TO ADDRESS CLIMATE CHANGE |
| WASHINGTON TRAILS ASSOCIATION | SEATTLE, WA | $100,000 | 2024 | TO PROVIDE GENERAL OPERATING SUPPORT |
| THE SIERRA CLUB FOUNDATION | OAKLAND, CA | $75,000 | 2024 | TO SUPPORT ICO |
| 350ORG | BOSTON, MA | $75,000 | 2024 | TO PROVIDE GENERAL OPERATING SUPPORT |
TO PROVIDE GENERAL OPERATING SUPPORT AND SUPPORT OF THE SOCIAL IMPACT CENTER
GENERAL OPERATING SUPPORT, WITH SPECIAL INTEREST IN OLT PROGRAM
350ORG
$75,000TO PROVIDE GENERAL OPERATING SUPPORT
NORTHWEST ABORTION ACCESS FUND
$65,000TO PROVIDE GENERAL OPERATING SUPPORT
FORTERRA
$50,000TO PROVIDE GENERAL OPERATING SUPPORT
FRESH TRACKS
$25,000TO PROVIDE GENERAL OPERATING SUPPORT
THE TRUST FOR PUBLIC LAND
$25,000GENERAL OPERATING SUPPORT IN TPL'S SEATTLE REGION
NATIONAL AUDUBON SOCIETY
$20,000TO SUPPORT OF AUDUBON WASHINGTONS SEWARD PARK CENTER
YOUTHCARE
$20,000TO PROVIDE GENERAL OPERATING SUPPORT
PACIFIC SCIENCE CENTER
$20,000TO PROVIDE GENERAL OPERATING SUPPORT
MARY'S PLACE
$20,000TO PROVIDE GENERAL OPERATING SUPPORT
PLYMOUTH HOUSING GROUP
$20,000TO PROVIDE GENERAL OPERATING SUPPORT
YWCA SEATTLE KING SNOHOMISH
$20,000TO SUPPORT OF WOMEN EXPERIENCING HOMELESSNESS
GENERAL OPERATING SUPPORT, WITH SPECIAL INTEREST IN REACHING YOUNGER AND MORE DIVERSE CLIMBERS
NORTHWEST CHOIRS
$10,000TO PROVIDE GENERAL OPERATING SUPPORT
SEATTLE SYMPHONY
$10,000TO PROVIDE GENERAL OPERATING SUPPORT
RAINIER VALLEY CORPS
$10,000TO SUPPORT THE AGEUP PROGRAM
NORTHWEST OUTWARD BOUND
$10,000TO PROVIDING GENERAL OPERATING SUPPORT OF PROGRAMMING IN MAZAMA, WA
NEW MEXICO STATE UNIVERSITY
$3,333TO PROVIDE GENERAL OPERATING SUPPORT
UNIVERSITY OF ARIZONA
$3,333IN SUPPORT OF GALS PROGRAM