Power of Attorney for Lota S. Zoth

This filing is an exhibit (EX-24.1) containing a Power of Attorney for Lota S. Zoth, a director of FIRST FINANCIAL BANKSHARES INC (FFIN). The document, dated April 22, 2026, grants power of attorney to certain officers of the company, including the CEO and CFO, to execute and file Forms 3, 4, and 5 on behalf of Ms. Zoth. These forms are related to reporting beneficial ownership of securities under Section 16(a) of the Securities Exchange Act of 1934. The Power of Attorney remains effective until Ms. Zoth is no longer required to file these forms or until she revokes it. Ms. Zoth agrees to indemnify the company and its appointed attorneys-in-fact against potential losses arising from inaccurate or untimely information provided for these filings.