THORNE ECOLOGICAL INSTITUTE

BOULDER, CO, 80308 (303) 499-3647 Est. 1954 EIN 84-6029250

C60Z - Environment 990 - Public charity return 501(c)(3)

www.thornenature.org

Mission

THORNE'S MISSION IS TO BUILD EARTH STEWARDSHIP BY CONNECTING YOUTH TO NATURE THROUGH JOYFUL, HANDS-ON, PLACE-BASED ENVIRONMENTAL EDUCATION EXPERIENCES.

Grants Awarded · 53 grants

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Financials

Total Revenue

$2,681,033

Total Expenses

$3,460,225

Net Assets

$5,921,782

82 employees 207 volunteers

From latest filing (tax period ending 2025-08-31)

Financial Health

Operating Reserve

20.5 months Healthy

Net assets / monthly expenses

Year-over-Year Change

Revenue ↓ 18.0%

Expenses ↓ 3.2%

Revenue Sources

Contributions 47.7% Earned revenue 51.4% Investment 0.9%

Expense Breakdown

Program 74.6% Management 15.4% Fundraising 10.0%

Officers & Trustees (18)

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Filing History (8 filings)

Year	Revenue	Expenses	Net Assets
2024 990 - Public charity return Sep 1, 2024 to Aug 31, 2025	$2,681,033 ↓	$3,460,225	$5,921,782
2023 990 - Public charity return Sep 1, 2023 to Aug 31, 2024	$3,270,743 ↓	$3,574,915	$6,610,007
2022 990 - Public charity return Sep 1, 2022 to Aug 31, 2023	$4,946,732 ↑	$2,724,855	$6,769,519
2021 990 - Public charity return Sep 1, 2021 to Aug 31, 2022	$3,202,535 ↑	$2,234,422	$4,482,972
2020 990 - Public charity return Sep 1, 2020 to Aug 31, 2021	$2,802,339 ↑	$2,035,638	$3,728,355
2020 990 - Public charity return Jan 1, 2020 to Aug 31, 2020	$1,022,609 ↓	$1,032,182	$2,735,093
2019 990 - Public charity return Jan 1, 2019 to Dec 31, 2019	$2,394,982 ↑	$1,969,561	$2,735,717
2018 990 - Public charity return Jan 1, 2018 to Dec 31, 2018	$1,771,675	$1,650,630	$2,167,003