Prospectus Certification by Investment Company (Form 497J)

GREEN CENTURY CAPITAL MANAGEMENT, INC.

114 State Street

Boston, Massachusetts 02109

(617) 482-0800

November 25, 2025

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

Filing Pursuant to Rule 497(j)

(33-41692 and 811-06351)

Dear Sir or Madam:

On behalf of the above-referenced registered investment company, pursuant to Rule 497(j) under the Securities Act of 1933, as amended, the Green Century Funds (the "Trust") hereby certifies that the form of Prospectus and Statement of Additional Information for the Green Century Funds that would have been filed on behalf of the Trust pursuant to Rule 497(c) upon the effectiveness of Post-Effective Amendment No. 62 to the Trust's Registration Statement on Form N-1A (the "Amendment") would not have differed from that contained in the Amendment which is the most recent amendment to such Registration Statement and was filed electronically on November 25 2025.

Please contact the undersigned at (617) 482-0800 with any questions about this certificate.