Form 485BXT VANGUARD STAR FUNDS

Explanatory Note

This Post-Effective Amendment No. 103 under the Securities Act of 1933, as amended (the “Securities Act”) (Amendment No. 105 under the Investment Company Act of 1940, as amended (the “1940 Act”)) to the registration statement on Form N-1A (the “Registration Statement”) of Vanguard STAR Funds (the “Trust”) is being filed pursuant to paragraph (b)(1)(iii) of Rule 485 under the Securities Act solely for the purpose of delaying, until February 27, 2025, the pending effective date of the Trust’s 102nd Post-Effective Amendment.

For background, Post-Effective Amendment No. 102 was filed under Rule 485(a)(1) on December 6, 2024, in connection with the changes to the asset allocation strategy of Vanguard STAR Fund, a series of the Trust that operates as a fund of funds, including changes to the allocations to underlying funds. Post-Effective Amendment No. 102 would have become effective on February 4, 2025.

This Post-Effective Amendment No. 103 incorporates by reference the information contained in Parts A, B, and C of Post- Effective Amendment No. 102 to the Registrant’s Registration Statement.