Charities United States Environment Coastal Maine Botanical Gardens Inc
Coastal Maine Botanical Gardens Inc logo

Coastal Maine Botanical Gardens Inc

To inspire connections among people and nature through horticulture, education, and research.

Environment Boothbay, ME EIN 010476545 · IRS Sign up to see website
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89
Integrity Assessment
Strong transparency
89/100 · methodology

About Coastal Maine Botanical Gardens Inc

Enjoy beautiful gardens, giant trolls, and miles of trails at New England's largest botanical garden, located on the coast of Maine.

Founded
Headquarters
Boothbay, ME
Foundation type
Publicly-supported charity (509(a)(2))
NTEE code
C410
IRS subsection
501(c)(03)
Ruling date

Verified certifications

Confirmed against the issuing authority - not self-reported.

IRS Tax-Deductible since 1993

Mission

To inspire connections among people and nature through horticulture, education, and research.

Focus areas & reach

· What they work on and where
🌿 Environment · NTEE C410
Cause tags

How it stacks up against peers

· vs. 6 similar environment in United States
Program spending This charity: 3%
Peer average: 0%
CEO comp as % of revenue This charity: 0.84%
Peer average: 0.48%
Integrity Assessment This charity: 89
Peer average: 89

Red flags

· All clear
IRS revocation history
Open investigations
Governance scandals
Related-party deals
Excessive exec comp

Where every $1 goes

Program expenses$0.03 ($6.6 million)

Common questions

· Auto-generated from filings + methodology

Coastal Maine Botanical Gardens Inc is a registered environment nonprofit based in Boothbay, ME, United States. It is registered with the Internal Revenue Service (IRS). It was founded in 1992 and has been operating for 34 years. Its EIN is 010476545. It has a GiveRadar Integrity Assessment of 89/100 (Strong transparency), indicating well-documented governance, financials, and contact details. The organization reports $29M in annual revenue. 117 officers and directors are publicly disclosed. No red flags have been detected.

Coastal Maine Botanical Gardens Inc has a GiveRadar Integrity Assessment of 89/100. This score combines five components: Registration (20 pts), Financial Transparency (30 pts), Governance (20 pts), Contact Availability (10 pts), and Data Recency (20 pts), with negative adjustments for any red flags. A score of 89 ('Strong transparency') reflects well-documented governance, recent financials, named leadership, and working contact details. For comparison, the average integrity assessment for environment charities in United States is 89/100.

Coastal Maine Botanical Gardens Inc is located in Boothbay, ME, United States. The organization was established in 1992 and has been active for 34 years.

Based on official tax filings, Coastal Maine Botanical Gardens Inc has $29M in annual revenue. It allocates 3% of expenses to programs and services. This is below the typical benchmark of 65-75% and may warrant further review. Its revenue is significantly above the peer average of $2M. Create a free GiveRadar account to view the complete financial breakdown with year-over-year trends.

Coastal Maine Botanical Gardens Inc is classified as a Environment organization, registered in United States. It operates as a Publicly-supported charity (509(a)(2)). It has $29M in annual revenue. The organization has 117 disclosed officers and directors.

No red flags have been detected for Coastal Maine Botanical Gardens Inc. GiveRadar automatically screens charities for concerning patterns including high executive compensation, low program spending, and missing financial filings. Based on available official data, no issues have been identified.

Coastal Maine Botanical Gardens Inc has a GiveRadar Integrity Assessment of 89/100 (Strong transparency) and no red flags have been detected, which suggests it is a well-documented organization. It is regulated by the IRS. 3% of expenses go to programs. Visit the Coastal Maine Botanical Gardens Inc profile on GiveRadar for full details before deciding. GiveRadar provides data for research purposes and does not endorse any organization. Always do your own due diligence.

Enjoy beautiful gardens, giant trolls, and miles of trails at New England's largest botanical garden, located on the coast of Maine. Coastal Maine Botanical Gardens Inc is classified as a environment organization registered in United States. The organization was founded in 1992.

Among environment charities registered in United States: Coastal Maine Botanical Gardens Inc's GiveRadar Integrity Assessment of 89/100 is in line with the peer average of 89/100. Its annual revenue of $29M is well above the peer average of $2M.

Yes, donations to Coastal Maine Botanical Gardens Inc are generally tax-deductible in the United States. Coastal Maine Botanical Gardens Inc is a 501(c)(3) tax-exempt organization. Its EIN is 010476545, which you can use for tax filing purposes. Donors can typically deduct contributions on their federal income tax return if they itemize deductions. Consult a tax professional for guidance specific to your situation.

Verified against 4 official sources, last refreshed .

Annual revenue
$10M-$100M
3% to programs
Source: IRS 990 (FY2025) why this matters
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Filing history

6 years on file from IRS 990 (FY2025): revenue, expenses, program spending, assets, and liabilities by fiscal year.

Years on record: FY2025, FY2024, FY2023, FY2022, FY2021, FY2020.
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Taxes

Tax-deductibility for donors

Donations may be tax-deductible for residents of United States under local rules. Confirm with the charity directly.

Always confirm tax treatment with the charity directly or your tax advisor before donating.

Leadership

GR
Gretchen Ostherr
President & CEO

Officers & trustees (25)

Source: Public filings

AN
Ann P••••
Secretary
BA
Barbara A•••••
Vice Chair
BE
Beth R••••
Director
BE
Betsey M••••••
Director
BE
Betts A••••••••
SECRETARY
BO
Bob B•••••
Director
CY
Cynthia H•••••
Director
DA
David R••••
Director
DY
Dyke M••••••
Director
DY
Dyke M•••••• J•
Director
ER
Erin M•••••••••••••••
CFO
ER
Errin S•••••
Director
GE
Geoff C•••••••••
Director
GR
Gretchen O••••••
President & CEO
HE
Helen N•••••
Director
JA
James Y••••••
Director
JE
Jeff L•••
Director
JE
Jennifer M•••••
VP of Philantropy & Marketing
JO
John A•••••
CHAIR
JO
John A••••
Director
JO
Jon F•••••
Director
JU
Judy P•••••••
Vice Chair
KA
Karen B••••••••••
Director
KE
Keith M•••••••
Director
KI
Kirsten P••••
Director
Full names, contact details & compensation

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Latest news

From global news sources

No recent news coverage found

News coverage will appear here when articles mention this organization.

Activity timeline

Filings and press mentions, merged

Form filed
$28.6M revenue
FY2025
IRS_990
Form filed
$12.8M revenue
FY2024
IRS_990
Form filed
$19.4M revenue
FY2023
IRS_990
Form filed
$23.3M revenue
FY2022
IRS_990
Form filed
$6.8M revenue
FY2021
IRS_990
Form filed
$12.3M revenue
FY2020
IRS_990

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Peer charities

Other environment in United States, by integrity assessment

Charity Score Revenue Program %
Coastal Maine Botanical Gardens Inc This page 89 $28.6 million 3%
Bass River Day Activity Program Inc 89 $13.5 million -
3rivers Incorporated 89 $14.0 million -
Utah Open Lands Conservation Association Inc 89 $11.4 million -
Truckee Donner Land Trust 89 $10.5 million -
Earthshare 89 $37.3 million -
Chesapeake Bay Trust 89 $36.0 million -

Sources and verification

Refreshed

Registration and legal identity
Internal Revenue Service (IRS) - Tax Exempt Organization Search
Financial filings
IRS Form 990 filings - Fiscal year 2025 most recent on file.
Officers and trustees
Internal Revenue Service (IRS) - Tax Exempt Organization Search - 117 disclosed in the public registry.
Supplementary verification
Charity Navigator

Data freshness

Last updated
May 27, 2026
Profile completeness
90%

What we don't know

Honest gaps - our score reflects transparency, not impact

Programs & projects
No named programs listed by the charity
Operating reach
Countries where programs run not specified

Methodology

GiveRadar combines public registry filings, ProPublica Nonprofit Explorer, Charity Navigator, GuideStar, and news archives into a single 0-100 integrity assessment. We don't take a cut of any donation, ever.

Read full methodology

Quick facts about Coastal Maine Botanical Gardens Inc

What is Coastal Maine Botanical Gardens Inc?
Coastal Maine Botanical Gardens Inc is a environment publicly-supported charity (509(a)(2)) based in Boothbay, United States. Enjoy beautiful gardens, giant trolls, and miles of trails at New England's largest botanical garden, located on the coast of Maine.
When was Coastal Maine Botanical Gardens Inc founded?
Coastal Maine Botanical Gardens Inc was founded in 1992.
Who leads Coastal Maine Botanical Gardens Inc?
Gretchen Ostherr serves as President & CEO.
Where is Coastal Maine Botanical Gardens Inc located?
Headquartered in Boothbay, United States.
What is Coastal Maine Botanical Gardens Inc's annual budget?
Annual revenue for fiscal year 2025 is approximately $10M-$100M. 3% of expenses go to program services.
Is Coastal Maine Botanical Gardens Inc trustworthy?
Coastal Maine Botanical Gardens Inc has a GiveRadar Integrity Assessment of 89 out of 100 (Strong transparency). The score reflects public-data transparency: registration, financial disclosure, governance, contact details, and how recently data was refreshed. It does not measure program impact.
What is Coastal Maine Botanical Gardens Inc's registration number?
IRS EIN: 010476545.
What is Coastal Maine Botanical Gardens Inc's website?
https://www.mainegardens.org/