HALLBERG BUTTERFLY GARDENS

EIN: 911767178 501(c)(3) Environment

SEBASTOPOL, CA

Total Revenue
$252,377
Total Expenses
$133,083
Total Assets
$2,126,245
Net Assets
$2,123,635
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Financial Vulnerability Assessment (Tuckman-Chang)

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Financial Trends

Organization Details

Formation Year
1997
Legal Domicile
CA
Principal Officer
DON MAHONEY
Phone
7078233420
Tax Period
2025-01-01 to 2025-12-31

HALLBERG BUTTERFLY GARDENS, founded in 1997, is a small nonprofit in the Environment sector that reported $252K in total revenue in fiscal year 2025. Revenue surged 214% from the prior year, signaling strong growth momentum. The organization ran a surplus of $119K, a strong 47% operating margin.

Mission

FOSTER THE BREEDING, PROPAGATION, PROTECTION, PRESERVATION AND SCIENTIFIC STUDY OF THE LEPIDOPTERA ORDER BY OPERATION OF ONE OR MORE EXPERIMENTAL BUTTERFLY HABITATS. PROVIDE EDUCATION AND INFORMATION CENTERS.

Program Service Accomplishments

Program 1
Expenses: $92,871

THE PROGRAM IS FOR THE PRESERVATION AND ENHANCEMENT OF BUTTERFLY HABITAT. THE GARDENS HOSTED REGULAR VOLUNTEERS EVERY TUESDAY AND THE LAST SATURDAY OF THE MONTH. THERE WERE 72 VOLUNTEERS DURING THE...

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THE PROGRAM IS FOR THE PRESERVATION AND ENHANCEMENT OF BUTTERFLY HABITAT. THE GARDENS HOSTED REGULAR VOLUNTEERS EVERY TUESDAY AND THE LAST SATURDAY OF THE MONTH. THERE WERE 72 VOLUNTEERS DURING THE YEAR WHO PUT IN A TOTAL OF OVER 353 HOURS. WORK INCLUDED TRAIL MAINTENANCE, PROPAGATION OF NATIVE AND HABITAT FRIENDLY PLANTS FOR THE GARDENS AND PLANT SALES, AND INVASIVE PLANT REMOVAL. VOLUNTEERS ALSO WORKED ON ENHANCEMENT & EXPANSION OF THE GARDEN'S MILKWEED PATCHES & NECTAR SOURCES FOR THE MONARCH HABITAT PATCH. THE MONARCH HABITAT PATCH IS INCLUDED IN THE ONGOING RESEARCH PROJECT HEADED BY THE NON-PROFIT, POLLINATOR PARTNERSHIP. THIS GROUP STUDIES THE PHENOLOGY OF THE MONARCH BUTTERFLY IN CALIFORNIA.ALSO A GRANT WAS RECEIVED FROM THE XERCES SOCIETY FOR PLANTS TO BE PLANTED IN THE MONARCH PATCH.

Program 2

THE HALLBERG BUTTERFLY GARDENS OFFERED THE FOLLOWING ACTIVITES DURING THE YEAR.SELF-GUIDED TOURS WERE OFFERED BY APPOINTMENT SPRING THROUGH FALL. THERE WERE 1,007 PEOPLE WHO CAME AND TOURED THE...

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THE HALLBERG BUTTERFLY GARDENS OFFERED THE FOLLOWING ACTIVITES DURING THE YEAR.SELF-GUIDED TOURS WERE OFFERED BY APPOINTMENT SPRING THROUGH FALL. THERE WERE 1,007 PEOPLE WHO CAME AND TOURED THE GARDENS INCLUDING 648 CHILDREN FROM LOCAL SCHOOLS. 728 BUTTERFLIES FROM 24 DIFFERENT SPECIES WERE IDENTIFIED BY GUESTS AND VOLUNTEERS WHO CAME TO THE GARDENS.THE GARDENS HELD ITS 5TH ANNUAL MOTH NIGHT IN JULY TO CELEBRATE NATIONAL MOTH WEEK.32 PEOPLE CAME TO LEARN THE IMPORTANCE OF MOTHS IN THE ECOSYSTEMS. THROUGHOUT THE EVENING THE PARTICIPANTS HELPED TO DOCUMENT AND ID THE MOTHS FOUND IN THE GARDENS AT 2 UV LIGHT STATIONS USED TO ATTRACT MOTHS AND OTHER INSECTS. THERE WERE 67 OBSERVATIONS FROM 34 DIFFERENT SPECIES OF MOTHS, BEETLES AND FLIES.EVERY FIRST SUNDAY OF THE MONTH GUESTS WERE INVITED TO DRAW AND PAINT OBSERVATIONS IN THE GARDENS.

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Trantor Score

Financial Health Score (300–850) · Liquidity · Solvency · Sustainability · Efficiency

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Liquidity (40%) • Solvency (30%) • Sustainability (20%) • Efficiency (10%)

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Financial Overview (2025)

Revenue Breakdown

Contributions & Grants $26,986
Program Service Revenue $0
Investment Income $206,927
Other Revenue $18,464
TOTAL REVENUE $252,377

Expense Breakdown

Grants Paid $0
Salaries & Benefits $70,829
Fundraising Expenses $0
Program Expenses $92,871
Other Expenses $62,254
TOTAL EXPENSES $133,083

Year-over-Year Comparison

2025 2024 Change
Revenue $252,377 $80,501 +2.1%
Expenses $133,083 $117,530 +0.1%
Net Income $119,294 $-37,029 -4.2%
Key Indicators
Grants to Organizations Grants to Individuals Lobbying Political Activity Foreign Activities Donor Advised Fund Schedule B Required
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Governance

Voting Members
6
Independent Members
5
Employees
1
Volunteers
90

Governance Policies

Conflict of Interest Policy
Whistleblower Policy
Document Retention Policy

Special Practices & Reported Activities

Operated a School
Operated a Hospital
Provided First Class Travel
Reported Conflict of Interest
Reported Asset Diversion
Excess Benefit Transaction
Made Political Expenditures
Engaged in Lobbying
Operated Donor Advised Fund
Maintained Art Collections
Filed Form 720

Compensation of Officers, Directors & Key Employees

Total Officers
3
$0
Total Directors
6
$0
Key Employees
0
$0
Highest Compensated
0
reported
Name Title Hours/Week Role Reportable Comp Other Comp Total
DON MAHONEY President 10.00
Officer Director
$0 $0 $0
LEAH BRORSTROM Board Member 5.00
Officer Director
$0 $0 $0
KATHY TRAFTON Secretary 5.00
Officer Director
$0 $0 $0
KATHY JACOBS Board Member 5.00
Director
$0 $0 $0
Isis Howard Board Member 5.00
Director
$0 $0 $0
JO BENTZ Treasurer 5.00
Director
$0 $0 $0
Note: Compensation data is self-reported by the organization on their Form 990. "Reportable Comp" includes salary, bonuses, and other reportable compensation from the organization and related organizations. "Other Comp" includes benefits, deferred compensation, and non-taxable benefits.

Historical Data

Year Revenue Expenses Assets Net Income
2025 $252,377 $133,083 $2,126,245 $119,294
2024 No data No data No data No data
2023 $37,998 $124,251 $1,792,456 $-86,253
2022 $123,859 $107,270 $1,720,950 $16,589
2021 $216,657 $89,783 $2,000,742 $126,874
2020 $90,142 $96,965 $1,857,682 $-6,823
2018 $106,408 $60,590 $1,696,351 $45,818
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