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Form 990-PFTax year 2024EIN 22-2778703

Winslow Foundation

A private foundation in Wilmington, DE. Its return for tax year 2024 lists 57 grants and $1.9 million paid in grants.

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

Tax year 2024 (period ending Dec 31, 2024), 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

Preselected only

The return checks the box saying the foundation gives only to preselected organizations and does not accept unsolicited requests.

Assets and giving by year

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

  • Tax year 2024

    $1,878,000

    Grants listed
    57
    Assets, end of year
    $30,381,441

  • Tax year 2023

    $1,883,999

    Grants listed
    46
    Assets, end of year
    $28,584,085

  • Tax year 2022

    $1,726,733

    Grants listed
    46
    Assets, end of year
    $29,425,846

  • Tax year 2021

    $2,211,160

    Grants listed
    57
    Assets, end of year
    $30,547,559

  • Tax year 2020

    $2,120,000

    Grants listed
    55
    Assets, end of year
    $29,424,736

  • Tax year 2019

    $1,712,360

    Grants listed
    40
    Assets, end of year
    $26,337,633

  • Tax year 2018

    $1,581,880

    Grants listed
    47
    Assets, end of year
    $26,729,662

Grants paid in 2024

57 grants, largest first

As listed on the return.

  1. Mothers Out Front IncBoston, MA

    General & Unrestricted

    $250,000
  2. Johns Hopkins UniversityBaltimore, MD

    Planetary Health Alliance

    $200,000
  3. Keep Our Republic Charitable FundWashington, DC

    General & Unrestricted

    $175,000
  4. Cambridge Health Alliance Foundation IncMalden, MA

    Climate Health Organizing Fellows Program

    $100,000
  5. Stanford UniversityStanford, CA

    Conservation Center for Biology

    $100,000
  6. Marine Conservation Biology InstituteGlen Ellen, CA

    General & Unrestricted

    $80,000
  7. Royal Roads UniversityVictoria, Canada

    Cascade Institute

    $75,000
  8. Appalachian VoicesBoone, NC

    General & Unrestricted

    $50,000
  9. Climate Cabinet EducationSan Francisco, CA

    General & Unrestricted

    $50,000
  10. Global ImpactWashington, DC

    Future US

    $50,000
  11. Government Accountability Project IncWashington, DC

    General & Unrestricted

    $50,000
  12. Greenlight AmericaWashington, DC

    General & Unrestricted

    $50,000
  13. Oil & Gas Action NetworkOakland, CA

    Climate Health Now

    $50,000
  14. Sustainable Markets FoundationNew York, NY

    Constitutional Democracy Initiative

    $50,000
  15. Wildearth GuardiansSanta Fe, NM

    General & Unrestricted

    $50,000
  16. Board of Regents of the University of Wisconsin SyMilwaukee, WI

    Pollinator biodiversity and the stability of ecosystem services in a changing climate

    $43,000
  17. Bennington College CorporationBennington, VT

    Beyond Plastics

    $40,000
  18. Hack FoundationW Hollywood, CA

    Campus Climate Network

    $40,000
  19. Saving Nature IncKnoxville, TN

    General & Unrestricted

    $40,000
  20. Virginia Organizing IncCharlottesvle, VA

    Science Communications Network

    $40,000
  21. Alliance for Youth OrganizingWashington, DC

    General & Unrestricted

    $35,000
  22. Carolina Federation FundDurham, NC

    General & Unrestricted

    $30,000
  23. Clean and Prosperous America Education FundSeattle, WA

    General & Unrestricted

    $30,000
  24. Fair Elections CenterWashington, DC

    General & Unrestricted

    $30,000
  25. Secure Families FoundationWashington, DC

    General & Unrestricted

    $30,000
  26. Worker Power InstitutePhoenix, AZ

    General & Unrestricted

    $30,000
  27. Make the Road States IncBrooklyn, NY

    Make the Road Nevada

    $25,000
  28. Onepa Activist UnitedPhiladelphia, PA

    General & Unrestricted

    $20,000
  29. Voces de la FronteraMilwaukee, WI

    General & Unrestricted

    $20,000
  30. Western Resource AdvocatesBoulder, CO

    General & Unrestricted

    $7,000
  31. Way to RiseWashington, DC

    General & Unrestricted

    $5,000
  32. People and Pollinators Action NetworkNiwot, CO

    General & Unrestricted

    $3,000
  33. 350VERMONTBurlington, VT

    General & Unrestricted

    $2,000
  34. High Country Conservation AdvocatesCrested Butte, CO

    General & Unrestricted

    $2,000
  35. High Country NewsPaonia, CO

    General & Unrestricted

    $2,000
  36. Rappahannock League for Environmental Protection IWashington, VA

    General & Unrestricted

    $2,000
  37. Colorado Plateau FoundationFlagstaff, AZ

    General & Unrestricted

    $1,500
  38. CultivandoEastlake, CO

    General & Unrestricted

    $1,500
  39. Home Energy Efficiency Team IncBoston, MA

    General & Unrestricted

    $1,500
  40. New Era Colorado FoundationDenver, CO

    General & Unrestricted

    $1,500
  41. 350 ColoradoBoulder, CO

    General & Unrestricted

    $1,000
  42. Center for Biological Diversity IncTucson, AZ

    General & Unrestricted

    $1,000
  43. Coal Creek Watershed CoalitionCrested Butte, CO

    General & Unrestricted

    $1,000
  44. Colorado Chautauqua AssociationBoulder, CO

    Garden Maintenance Fund

    $1,000
  45. Colorado Organization for Latina Opportunity and RDenver, CO

    General & Unrestricted

    $1,000
  46. Conservation Colorado Education FundDenver, CO

    General & Unrestricted

    $1,000
  47. Earth Restoration AllianceCarbondale, CO

    General & Unrestricted

    $1,000
  48. EcoflightAspen, CO

    General & Unrestricted

    $1,000
  49. Environmental Health SciencesBozeman, MT

    Environmental Health News

    $1,000
  50. GreenlatinosBoulder, CO

    Colorado focused work

    $1,000
  51. Pajarito Environmental Education CenterLos Alamos, NM

    General & Unrestricted

    $1,000
  52. Planned Parenthood Federation of America IncNew York, NY

    General & Unrestricted

    $1,000
  53. Resource CentralBoulder, CO

    General & Unrestricted

    $1,000
  54. Southwest Energy Efficiency Project LLCBoulder, CO

    General & Unrestricted

    $1,000
  55. Wildaid IncSan Francisco, CA

    General & Unrestricted

    $1,000
  56. Colorado Chautauqua AssociationBoulder, CO

    General & Unrestricted

    $500
  57. Colorado SunDenver, CO

    General & Unrestricted

    $500

Where the money goes

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

  1. Environment20 grants $537,00037% of the total
  2. Civil rights5 grants $261,50018% of the total
  3. Education5 grants $226,50016% of the total
  4. Health2 grants $101,0007% of the total
  5. International aid2 grants $80,0006% of the total
  6. Human services3 grants $75,0005% of the total
  7. 7 other causes10 grants $172,50012% of the total

By State

Grants to organizations with a US address, latest year.

  1. Maryland2 grants $375,000
  2. Massachusetts3 grants $351,500
  3. District of Columbia8 grants $251,000
  4. California5 grants $241,000
  5. North Carolina3 grants $120,000
  6. Washington2 grants $110,000
  7. New York2 grants $75,000
  8. Wisconsin2 grants $63,000
  9. New Mexico2 grants $51,000
  10. Virginia2 grants $42,000

Officers, directors and trustees

4 people as filed

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

  • Morgan McMillanSec, executive dir Hours 40Pay $118,000
  • Christopher WirthVP, Trustee, Treas Hours 1Pay $0
  • Kelsey WirthTrustee, Pres Hours 4Pay $0
  • Wren W WirthTrustee Hours 1Pay $0

The return

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