Nonprofit · EIN 91-1767178
HALLBERG BUTTERFLY GARDENS
Tax-exempt · SEBASTOPOL, CA 95472
Financials
| Year ended | Form | Revenue | Expenses | Net income | Total assets | Liabilities | Net assets |
|---|---|---|---|---|---|---|---|
| December 31, 2025 | 990 | $252,377 | $133,083 | $119,294 | $2,126,245 | $2,610 | $2,123,635 |
| December 31, 2024 | 990 | $80,501 | $117,530 | -$37,029 | $1,914,475 | $2,923 | $1,911,552 |
| December 31, 2023 | 990 | $37,998 | $124,251 | -$86,253 | $1,792,456 | $2,367 | $1,790,089 |
Financial details: 990 for the year ended December 31, 2025
Revenue
- Contributions, gifts and grants
- $26,986
- of which government grants
- $10,000
- Program service revenue
- $0
- Investment income
- $206,927
- Net gain from sales of assets
- $161,156
- Net income from sales of inventory
- $18,464
- Other revenue
- $18,464
Expenses
- Grants and similar amounts paid
- $0
- Compensation of officers, directors and key employees
- $0
- Other salaries and wages
- $56,701
- Salaries, compensation and benefits (total)
- $70,829
- Professional fundraising fees
- $0
- Accounting fees
- $10,495
- Depreciation
- $10,962
- Program services (functional)
- $92,871
- Management and general (functional)
- $40,212
Balance sheet and other
- Total assets, start of year
- $1,914,475
- Total assets, end of year
- $2,126,245
- Total liabilities, end of year
- $2,610
- Net assets, end of year
- $2,123,635
- Land, buildings and equipment
- $749,844
- Publicly traded securities
- $1,363,356
- Net assets without donor restrictions
- $2,123,635
- Gross receipts
- $546,230
- Employees
- 1
- Volunteers
- 90
- Year formed
- 1997
- State of legal domicile
- CA
From the e-filed returns the IRS publishes as XML (latest three processing years; amended returns replace the original). PDF copies at the IRS.
Officers, directors and key employees
As listed on the 990 for the year ended December 31, 2025, highest compensation first.
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DON MAHONEY | President Trustee or director, Officer | 10 | $0 |
| LEAH BRORSTROM | Board Member Trustee or director, Officer | 5 | $0 |
| KATHY TRAFTON | Secretary Trustee or director, Officer | 5 | $0 |
| KATHY JACOBS | Board Member Trustee or director | 5 | $0 |
| Isis Howard | Board Member Trustee or director | 5 | $0 |
| JO BENTZ | Treasurer Trustee or director | 5 | $0 |
990 for the year ended December 31, 2024: 5 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DON MAHONEY | President Trustee or director, Officer | 10 | $0 |
| LEAH BRORSTROM | Treasurer Trustee or director, Officer | 5 | $0 |
| KATHY TRAFTON | Secretary Trustee or director, Officer | 5 | $0 |
| KATHY JACOBS | Director Trustee or director | 5 | $0 |
| JO BENTZ | Director Trustee or director | 5 | $0 |
990 for the year ended December 31, 2023: 5 people
| Name | Title | Hours / week | Compensation |
|---|---|---|---|
| DON MAHONEY | President Trustee or director, Officer | 10 | $0 |
| LEAH BRORSTROM | Treasurer Trustee or director, Officer | 5 | $0 |
| KATHY TRAFTON | Secretary Trustee or director, Officer | 5 | $0 |
| KATHY JACOBS | Director Trustee or director | 5 | $0 |
| JO BENTZ | Director Trustee or director | 5 | $0 |
Address and contacts
- Address (IRS master file)
- 8687 OAK GROVE AVE, SEBASTOPOL, CA 95472-2454
- Principal officer (990 for 2025)
- DON MAHONEY, 8687 OAK GROVE AVE, SEBASTOPOL, CA 95472
- Signed the 990
- JO BENTZ, Treasurer
- Phone
- (707) 823-3420
- Return prepared by
- Ann M Carinalli CPAInc
California records
California keeps its own records of charities and corporations. Search them by EIN 91-1767178 or by the name HALLBERG BUTTERFLY GARDENS.
- Attorney General, Registry of Charities and Fundraisers
- Registration status and filed reports (CT-TR-1, RRF-1)
- Secretary of State, bizfile Online
- Corporation status, entity number, agent for service
- Franchise Tax Board
- Entity status letter (state tax exemption, good standing)
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 accomplishments
- 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.Expenses $92,871
- 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.
What it must file and when
IRS records say it files Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N. Its accounting year ends in December, so each return is due on the 15th day of the 5th month after that.
| Tax year | Year ended | Due | IRS public records |
|---|---|---|---|
| 2025 | December 31, 2025 | May 15, 2026 | 990 on file |
| 2024 | December 31, 2024 | May 15, 2025 | 990 on file |
| 2023 | December 31, 2023 | May 15, 2024 | 990 on file |
IRS record
- EIN
- 91-1767178
- Tax-exempt status
- 501(c)(3): Charitable, religious, educational or scientific organization
- Foundation status
- Publicly supported organization (170(b)(1)(A)(vi))
- Donations deductible (Pub 78)
- Public charity, 50% deduction limit
- Exempt since
- 1997
- Accounting year ends
- December
- Files
- Form 990 or 990-EZ
- Category (NTEE)
- Environment (C410)
- Assets (IRS master file)
- $2,126,245
- Income (IRS master file)
- $546,230
Filing history
| Form | Year ended | Revenue | Expenses | Assets | Return |
|---|---|---|---|---|---|
| 990 | December 2025 | $252,377 | $133,083 | $2,126,245 | IRS |
| 990 | December 2024 | $80,501 | $117,530 | $1,914,475 | IRS |
| 990 | December 2023 | $37,998 | $124,251 | $1,792,456 | XML |
| 990 | December 2022 | $123,859 | $107,270 | $1,720,950 | IRS |
| 990 | December 2021 | – | – | – | IRS |
| 990 | December 2020 | – | – | – | IRS |
| 990 | December 2018 | – | – | – | IRS |
990-N: the IRS bulk file holds only the latest e-Postcard per organization; earlier years come from archived copies of that file since 2020 and can have gaps (the IRS e-Postcard search lists every one). 990, 990-EZ, 990-PF, 990-T: every e-filed return in the IRS e-file index since 2019; XML for the latest three processing years, amounts from the IRS Statistics of Income extracts before that. PDF copies and determination letters at the IRS (search EIN 91-1767178).
Questions about HALLBERG BUTTERFLY GARDENS
- What is the EIN of HALLBERG BUTTERFLY GARDENS?
- The employer identification number (EIN) of HALLBERG BUTTERFLY GARDENS is 91-1767178.
- Is HALLBERG BUTTERFLY GARDENS tax-exempt?
- Yes. The IRS lists it as tax-exempt under section 501(c)(3) since 1997.
- Are donations to HALLBERG BUTTERFLY GARDENS tax-deductible?
- Yes. It is listed in IRS Publication 78 (Public charity, 50% deduction limit).
- Which annual return does HALLBERG BUTTERFLY GARDENS file?
- Form 990 or 990-EZ. Based on its last return; a smaller organization may file the 990-N.
- When is the next return of HALLBERG BUTTERFLY GARDENS due?
- The return for tax year 2026 (the year ending December 31, 2026) is due May 17, 2027. Form 8868 extends it by six months; the 990-N cannot be extended.
- When did HALLBERG BUTTERFLY GARDENS last file with the IRS?
- The latest return in the IRS public files is the 990 for the year ended December 2025.
- Who is the principal officer of HALLBERG BUTTERFLY GARDENS?
- The 990 for the year ended December 31, 2025 names DON MAHONEY.
- Who are the officers and directors of HALLBERG BUTTERFLY GARDENS?
- The 990 for the year ended December 31, 2025 lists 6 people; 0 received compensation from the organization.
- How much revenue does HALLBERG BUTTERFLY GARDENS have?
- On its 990 for the year ended December 31, 2025 it reported revenue of $252,377, expenses of $133,083 and total assets of $2,126,245 at year end.
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