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.

Giving Portfolio

Total Grants
63
Total Giving
$1.6M
Recipients
60
Years Active
2018 - 2024
Avg grant: $25,278 Median: $18,333

Yearly Trends

YearGrantsTotal Giving Avg GrantNewRepeat
20247$139K $20K25
20234$112K $28K04
20226$151K $25K06
20216$140K $23K06
202014$304K $22K29
201914$464K $33K311
201812$308K $26K120

Sectors Funded

Environment
27
Community Improvement
6
Arts, Culture & Humanities
5
Education
3
Youth Development
1

Top States

Colorado
62
North Carolina
1

Grantee Size Profile

$1M - $5M
29
$500K - $1M
8
$10M - $50M
8
$100K - $500K
6
Under $100K
1

Top Grantees

Page 1 of 3
$428K
CO - 8 grants
$307K
CITY OF LAFAYETTE
CO
$118K
CO - 5 grants
$58K
CO - 3 grants
$50K
CO - 5 grants
$42K
CENTAURUS HIGH SCHOOL
CO - 2 grants
$39K

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)

YearRevenueExpensesNet 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

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EIN: 84-6029250 · Source: IRS Form 990 e-file data