Tree-Ring Society
Public records show a registered, tax-exempt organization in good standing.
What it says it does
The Tree-Ring Society's purpose is to promote and support the science of Dendrochronology
- Income
- $77,783
- Spending
- $57,572
- Reserves
- 18.4 months of spending
- Largest source of income
- other income, 100%
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Financial health
We do not score finances when yearly spending is very small or the return has too little detail. The ratios stop meaning much at that size.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Governance
This organization files the short tax form, which does not ask about boards, policies or audits. That is normal for a small charity and is not a mark against it.
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Impact evidence
Describes programs. Its tax return describes what it does but we have found no measurable results in it.
Programs described in its return (3)
- $4,425 spent. The Tree-Ring Society offers financial support to conferences such as African Field School, to promote the learning and education in the field of Dendrochronology. In 2025, the Tree-Ring Society gave a $2,000 support to hold the conference, plus award plaques were created for people who excelled in the field, $2,425.
- $7,424 spent. The Tree-Ring Society publishes a bi-annual journal, Tree-Ring Research in which valuable articles serve as education and learning opportunities to support the field of tree-ring dating (dendrochronology). This journal is available as part of being a member of the Tree-Ring Society with more than 200 members as well as access through institutions and databases to thousands of people.
- $33,556 spent. The Tree-Ring Society hold an annual week-long field school in varying different locations in which students and scientists participate in a variety of lectures, labs and field opportunities to learn and expand their knowledge in the field of Dendrochronology. It is a hands-on education which provides lodging, transportation, food, all education materials and equipment to use during the school. This school has approx.33 people in attendance and is ongoing
Source: Form 990EZ for the year ending December 31, 2025, filed with the Internal Revenue Service. Rating method 2026.2. How we rate
Legitimacy checks
Is it registered with the IRS? Passed.
Listed in the IRS master file of tax-exempt organizations as a 501(c)(3) charitable organization.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
Has the IRS revoked its tax-exempt status? Passed.
Not on the IRS automatic revocation list.
Source: Automatic revocation of exemption list, Internal Revenue Service, file dated November 6, 2026.
Are donations tax-deductible? Passed.
On the IRS list of organizations eligible to receive tax-deductible contributions.
Source: Publication 78 data: organizations eligible for tax-deductible contributions, Internal Revenue Service, file dated October 13, 2026.
Is it keeping up with its IRS filings? Passed.
Most recent return on file covers the year ending December 2025.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
How long has it been tax-exempt? Passed.
Recognized by the IRS since February 2016.
Source: Exempt Organizations Business Master File, Internal Revenue Service, file dated October 13, 2026.
Is it in good standing with state regulators? Passed.
Not on California's list of charities barred from soliciting. Other states are not yet checked.
Source: May Not Operate or Solicit for Charitable Purposes list, California Attorney General, Registry of Charities and Fundraisers, file dated November 4, 2026.
Ratings and checks are our reading of public records, using the published method. They are not a statement about anyone's honesty. If you work for this organization, you can send corrections or results, confirm you want gifts through Veridonate, or ask to be removed from giving.