Exhibit 23 Consent of Independent Auditors We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-36205) pertaining to the Zions Bancorporation Employee Investment Savings Plan of our report dated June 17, 2002, with respect to the financial statements and schedule of the Zions Bancorporation Employee Investment Savings Plan included in this Annual Report (Form 11-K) for the year ended December 31, 2001. Salt Lake City, Utah /s/Ernst & Young LLP June 26, 2002 12