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Form 990-PFTax year 2025EIN 95-6048727

Diffenbaugh Foundation

A private foundation in Stanford, CA. Its return for tax year 2025 lists 5 grants and $13,000 paid in grants.

See which foundations fund work like yours Matching by cause, place and grant size

Tax year 2025 (period ending Dec 31, 2025), read from the IRS e-file on Nov 11, 2026. Returns reach the IRS 5 to 18 months after the year they describe.

How to apply

Accepts applications

The return gives an application contact and rules, as below.

Contact
Polly Diffenbaugh
PO Box 20204
Stanford, CA 94305
(650) 223-9421
Form and materials
No Specific Form Requirements
Deadlines
No Submission Deadline
Restrictions
No Restrictions or Limitations on Awards

Assets and giving by year

8 returns on file
Grants paid by tax year. The latest year is in blue.

  • Tax year 2025

    $13,000

    Grants listed
    5
    Assets, end of year
    $295,841

  • Tax year 2024

    $8,000

    Grants listed
    4
    Assets, end of year
    $264,818

  • Tax year 2023

    $8,000

    Grants listed
    4
    Assets, end of year
    $248,126

  • Tax year 2022

    $15,000

    Grants listed
    7
    Assets, end of year
    $273,857

  • Tax year 2021

    $15,000

    Grants listed
    6
    Assets, end of year
    $296,418

  • Tax year 2020

    $15,000

    Grants listed
    5
    Assets, end of year
    $280,742

  • Tax year 2019

    $15,000

    Grants listed
    4
    Assets, end of year
    $282,355

  • Tax year 2018

    $15,000

    Grants listed
    4
    Assets, end of year
    $300,713

Grants paid in 2025

5 grants, largest first

As listed on the return.

  1. Vermillion Sea InstituteBonita, CA

    General

    $7,000
  2. Marine Mammal CenterSausalito, CA

    General

    $2,000
  3. Wildman Science LearningHalf Moon Bay, CA

    General

    $2,000
  4. The Teaching WellOakland, CA

    General

    $1,500
  5. Growing Together Bay AreaOakland, CA

    General

    $500

Where the money goes

By cause: grants to organizations we matched to the IRS list of exempt organizations, by their category.

  1. Animals1 grant $2,00050% of the total
  2. Education2 grants $2,00050% of the total

By State

Grants to organizations with a US address, latest year.

  1. California5 grants $13,000

Officers, directors and trustees

3 people as filed

As filed on the return, with average hours per week and pay from the foundation.

  • Flora WorleySecretary Hours 0Pay $0
  • Ann BallietPresident Hours 0Pay $0
  • Polly DiffenbaughSecretary/Treasurer Hours 5Pay $0

The return

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