EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference and use of our report, dated January 9, 2003, appearing in the Annual Report on Form 10-K of Redwood Empire Bancorp for the year ended December 31, 2002, in Registration Statement No. 33-49372 on Form S-8 and Registration Statement No. 33-61750 on Form S-3 of Redwood Empire Bancorp. Crowe, Chizek and Company LLP South Bend, Indiana March 25, 2003