Diffenbaugh Foundation
Historical FunderStanford, California · EIN 95-6048727 · Private foundation
Half of its grants to organizations were between $1,500 and $2,000.
How to apply
The foundation filed the following application information (Form 990-PF Part XV, tax year 2025):
| Contact | Polly Diffenbaugh |
|---|---|
| Address | PO Box 20204, Stanford CA 94305 |
| Phone | 6502239421 |
| Form and materials | No Specific Form Requirements |
| Deadlines | No Submission Deadline |
| Restrictions | No Restrictions or Limitations on Awards |
Copied as filed. Deadlines on a tax return describe the foundation's usual process; they are not confirmation of a current open cycle.
What it funds
Share of grant lines on the latest return, classified from the purpose each grant states.
Where it gives
0% of grants went outside California.
Grants paid in tax year 2025
| Recipient | Location | Purpose | Amount |
|---|---|---|---|
| Vermillion Sea Institute | Bonita, CA | General | $7,000 |
| Marine Mammal Center | Sausalito, CA | General | $2,000 |
| Wildman Science Learning | Half Moon Bay, CA | General | $2,000 |
| The Teaching Well | Oakland, CA | General | $1,500 |
| Growing Together Bay Area | Pinole, CA | General | $500 |
Giving by year
| Tax year | Grants paid | Grant lines |
|---|---|---|
| 2025 | $13,000 | 5 |
| 2024 | $8,000 | 4 |
| 2023 | $8,000 | 4 |
Sources
- IRS Form 990-PF, tax year 2025, filed Jul 27, 2026 - IRS e-file batch, object ID 202642089349100319
- IRS Tax Exempt Organization Search for EIN 95-6048727
- Profile updated Nov 9, 2026
Facts on this page come from the foundation's own IRS Form 990-PF filings as published by the IRS. Grantvello does not know whether a foundation is accepting proposals right now: a past grant is not an open opportunity. Always confirm current guidelines with the funder before applying.