Arizona · Nonprofit
TOHONO CHUL PARK INC
TOHONO CHUL PARK INC (Arizona) receives grants from 23 organizations whose IRS filings report $2,172,137 to it, the largest being WALLACE RESEARCH FOUNDATION ($1,169,000). 13 of them have funded it in more than one year.
- Revenue FY2025
- $4.7M
- Funders on record
- 23
- Grants received
- $2.2M
- Net assets
- $11M
What Tohono Chul Park Inc does
Mission
We are a community oasis where reverence for the cultural and natural ecology of the sonoran desert region inspires responsible stewardship so that future generations may thrive.
As stated on its FY2025 Form 990.
Programs
Gardens & facilitiesthe gardens and facilities team at tohono chul had another great year of fulfilling our core mission of making tohono chul a community oasis that inspires responsible stewardship while cultivating reverence for the cultural and natural ecology of the sonoran desert.one of our biggest accomplishments on the community oasis missions was fundraising for and completing a new 700' pathway from the heart of our gardens out to our desert discovery center and the children's museum of oro valley. This pathway was built to be 100% ada accessible, greatly expanding the accessible portions of our park and allowing us to welcome all members of our community. The path was built using a material called porous pave, made from recycled tires, reducing the carbon footprint of the path while also creating a porous surface that allows water to infiltrate into the soil and towards the roots of surrounding vegetation.we inspired responsible stewardship by installing a new water harvesting cistern that prevents flooding while storing water for landscape use, reducing our dependence on potable water for irrigation. We constructed four new basins that passively harvest rainwater and…
$1,290,926 spent$1,096,246 earned by the program38% of program spendingArts & engagementtohono chul's arts and cultural programming celebrates the diversity of the southwest with an emphasis on the relationship between people, place, and the sonoran desert environment. Programming includes rotating exhibitions, lectures, workshops, performances, and interpretive experiences designed to foster cultural awareness and environmental understanding.tohono chul maintains three galleries located in a historic 1937 residence. During fiscal year 2025, rotating exhibitions displayed 901 works by 164 artists. Main gallery exhibitions included the exotic sublime | treading softly, exploring terrestrial biodiversity in the sonoran desert; the exotic sublime | on plants, focusing on plant life across desert landscapes; jim waid and andy iventosch: the heart of nature; 40 for 40, an invitational exhibition honoring tohono chul's 40th anniversary; and impressions in place, examining artistic interpretations of place and identity.three calls for entries were issued during the year with no submission fee, supporting access for emerging and established artists. Four public opening receptions were held in the main gallery, each free and open to the public, followed by…
$543,764 spent$96,442 earned by the program16% of program spendingGuest servicesduring the past year, tohono chul park welcomed more than 76,000 visitors and maintained approximately 14,000 active members. In addition, the children's museum received over 28,000 visitors. We continued the merry market during the holiday season, offering extended evening hours to increase accessibility for community members.to support high quality guest experiences across public programs and private rentals, we expanded staffing by hiring a private rentals manager and an events assistant. Throughout the year, we hosted 19 weddings, 7 celebrations of life, 17 corporate gatherings, and 17 additional private events, providing opportunities for individuals and organizations to gather in the gardens for significant life events and community celebrations. These private rentals included collaborations with tucson foodie and the local bookstore stacks.seasonal and recurring events remain an important component of the visitor experience. These included bloom night, chiles, chocolate and day of the dead festival, and holiday nights. The chiles, chocolate and day of the dead festival included a special evening concert by tucson based band xixa as part of its cultural…
$1,559,266 spent$885,358 earned by the program46% of program spending
The 3 programs described on its FY2024 Form 990, listed largest first by expense. Program spending in total: $3,393,956.
The organization over time
Each line starts at 100 in 2019, so what you read is the shape rather than the size: 150 means half as much again as 2019, 50 means half. The number beside each label in the key is where it ended. The shaded band is where the middle 50% of its peers' revenue would sit, given their growth.
Balance sheet
Total assets and total liabilities at each year end, in dollars. The largest one-year move in total assets was 2021 to 2022, from $10M to $11M (+13%).
How it's funded, over time
Each bar is one year's revenue split into where it came from, and every bar is the same height — these are shares, not amounts, so a year that raised twice as much looks the same size. Hover a bar for the split.
Government-grant reliance: 2019 1% · 2020 2% · 2021 9% · 2022 5%. Grants only. Government contracts and fees sit inside program revenue.
31% of TOHONO CHUL PARK INC’s revenue is contributions — more earned-revenue than three-quarters of its peers (88% for the typical peer).
Surplus & reserves
Operating surplus or deficit each year, and months of liquidity in hand. 3 of the last 7 reported years ran a deficit.
reserve
Leadership and staff
The officers, directors, trustees and key employees listed on each return. Joined and no longer listed compare each filing with the year before, matching people by surname and first initial; a year after a gap, or a roster under three people, has no comparison.
Chief executive
Jamie Maslyn Larson
CEO
Board chair
Koren Manning
Chair
As listed on its FY2025 Form 990.
Who funds it, year by year
2017 → 2023: the base held at 7 funders, grant income fell $289k → $141k.
6 of 23 of your funders are donor-advised or pass-through sponsors (tagged DAF) — 20% of grant dollars received. That money is really individual donors directing a sponsor; the institutions to cultivate are the non-DAF funders.
From the IRS filings of TOHONO CHUL PARK INC’s funders (the co-funder graph). Top 22 of 23 funders by total. Association, not causation. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How concentrated its funding is
TOHONO CHUL PARK INC leans on a few funders — its largest provides 54% of grant income and the top three 80%; half comes from just 1 funder.
the vertical line marks half of all grant income — 1 funder to its left
34% of the income these shares are computed over arrives through pass-through sponsors or from payers whose filings do not say what kind of payment it is. Concentration is still measured over all of it, because the money is real; what it does not support is a claim about how many institutions have chosen to fund TOHONO CHUL PARK INC.
Largest funder’s share by year: 2017 82% · 2018 44% · 2019 74% · 2020 69% · 2021 56% · 2022 30% · 2023 53% — diversifying over time.
“Effective funders” = inverse Herfindahl index (1 / Σ shareᵢ²) — the number of equal-sized funders that would give the same concentration. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
How long its funders stay
41% of TOHONO CHUL PARK INC's funders are still giving 3 years after their first grant; 57% give in more than one year at all.
Share of funders still giving k years after their first recorded grant, pooled across every acquisition cohort. A funder counts as retained in a year only if it made a grant that year. Measured to FY2023, the last fiscal year that has finished arriving — a funder cannot be counted as lapsed in a year most filers have not reached.
Where its funders are
TOHONO CHUL PARK INC draws 74% of its grant income from funders outside Arizona, across 9 states in all.
In-state vs out-of-state, by year
Funder states come from each funder’s own filing. $443k arriving through sponsors registered in 5 states is excluded from the map and the split above: a sponsor holds money on a donor’s behalf, so its registered address would place those dollars somewhere no donor need ever have been. Trends are read to FY2023, the last fiscal year that has finished arriving. FY2024–FY2026 are still being filed and are shown unshaded; they do not move any figure on this page.
Against its field
TOHONO CHUL PARK INC's revenue grew 65% between 2019 and 2025.
this organization peer median middle 50% of peers· 1,209 environment nonprofits $1M–$10M, FY2025
Organizations like TOHONO CHUL PARK INC
Organizations whose mission and program text most resemble this one, by semantic similarity over every organization in the US filings — the closest peers, and often the clearest route to shared or prospective funders.
In Arizona
Nationally
Read directly from this organization’s own Form 990, as neutral context.
Where the money goes
78% of spending goes to programs.
Governance
Public support
44%
Share of support from the public (Schedule A) — the basis for its public-charity status.
Screen this organization
A dated, signed PDF of the compliance screen for TOHONO CHUL PARK INC: IRS status (Business Master File, Publication 78, auto-revocation), the OFAC sanctions lists, the Internal Revenue Bulletin, and California registration, with the Rev. Proc. 2018-32 §8.01 reliance elements stated element by element. Generated from the current files at the moment you download it.
Screens are triage, not determinations; a source that cannot be read reports not screened, never clear. Screen this nonprofit · How the screen works · on the API as GET /api/screening/{ein}?format=pdf
Questions and answers
- Who funds TOHONO CHUL PARK INC?
- TOHONO CHUL PARK INC (Arizona) receives grants from 23 organizations whose IRS filings report $2,172,137 to it, the largest being WALLACE RESEARCH FOUNDATION ($1,169,000). 13 of them have funded it in more than one year.
- How many funders does TOHONO CHUL PARK INC have?
- IRS filings report 23 organizations giving $2,172,137 in grants to TOHONO CHUL PARK INC, 13 of which have funded it in more than one year.
- Who is the largest funder of TOHONO CHUL PARK INC?
- WALLACE RESEARCH FOUNDATION is the largest funder on record, with $1,169,000 in grants. The full list of funders is on this page.
- How can an organization like TOHONO CHUL PARK INC find more funders?
- Start with the funders already giving here, then look at the foundations that back similar organizations in Arizona. The funding by cause and by state pages list the largest funders for a given area and how to approach them.
Play a game about who funds Tohono Chul Park →
These figures are read directly from IRS Form 990 / 990-PF e-file XML: this organization’s own return for FY2025 (financials across 2019–2025), and the filings of 23 funders that report grants to it. “On record” means captured in the filings we have parsed — a funder that does not e-file, or whose grant detail is not itemized, will not appear. Filings run roughly 12–24 months behind. Trends on this page end at FY2023, the last fiscal year that has finished arriving; later years are shown and marked, and move no figure. Data on this page was exported October 22, 2026. What this page cannot tell you · view filing