EXHIBIT 99.1

***FOR IMMEDIATE RELEASE***

ZIONS BANCORPORATION ANNOUNCES ENTRY INTO NEW EQUITY

DISTRIBUTION AGREEMENTS

SALT LAKE CITY, August 18, 2010 — Zions Bancorporation (“Zions” or the “Company”) (NASDAQ: ZION) announced today that it had entered into new common equity distribution agreements with each of Deutsche Bank Securities Inc. and Goldman, Sachs & Co., pursuant to which the Company may offer and sell through or to Deutsche Bank Securities Inc. and Goldman, Sachs & Co., as sales agents, from time to time, shares of the Company’s common stock, with aggregate sales of up to $200,000,000. Sales of the common stock, if any, will be made by means of ordinary brokers’ transactions on the Nasdaq Global Select Market, or otherwise, at market prices, or to Deutsche Bank Securities Inc. or Goldman, Sachs & Co. for resale at a price to be agreed upon by the Company and such sales agent. The Company is conducting this offering to maintain its existing capital and liquidity position.

These new equity distribution agreements supersede the common equity distribution arrangements that the Company established with Deutsche Bank Securities Inc. and Goldman, Sachs & Co. on March 1, 2010 and amended on May 19, 2010. Under the previous equity distribution agreements, during the period from March 1, 2010 to June 21, 2010, the Company sold an aggregate of 18,557,507 shares of its common stock at a volume weighted average price of approximately $22.23 per share, which resulted in net proceeds to the Company of $406.3 million.

Under the new equity distribution agreements, each sales agent will receive a commission equal to 1.50% of the gross sales price per share for any shares sold through it as the Company’s sales agent. It is anticipated that the shares of the Company’s common stock will be issued over the next several quarters.

The shares of common stock will be issued pursuant to the Company’s Registration Statement on Form S-3 (No. 333-158319) previously filed by the Company with the Securities and Exchange Commission (the “Commission”). The Registration Statement relating to the common stock has been filed with the Commission and is effective. Copies of the prospectus supplement and accompanying prospectus relating to the offering may be obtained when available by contacting Deutsche Bank Securities Inc., Attention: Prospectus Department, Harborside Financial Center, 100 Plaza One, Jersey City, New Jersey 07311-3988, telephone: (800) 503-4611 or by emailing prospectusrequest@list.db.com, by contacting Goldman, Sachs & Co., Attention: Prospectus Department, 200 West Street, New York, New York 10282, telephone: (866) 471–2526, facsimile: (212) 902–9316 or by emailing prospectus–ny@ny.email.gs.com, or by visiting EDGAR on the Commission’s website at www.sec.gov.

This press release is for informational purposes only and does not constitute an offer to sell or the solicitation of an offer to buy common stock of the Company or any other securities and shall not constitute an offer, solicitation or sale of any securities in any jurisdiction in which such offer, solicitation or sale would be unlawful.

Forward-Looking Information

Statements in this press release that are based on other than historical data, including those contained herein regarding the Company’s equity distribution program, or that express the Company’s expectations regarding future events or determinations are forward-looking within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements provide current expectations or forecasts of future events or determinations. These forward-looking statements are not guarantees of future performance or determinations, nor should they be relied upon as representing management’s views as of any subsequent date. Forward-looking statements involve significant risks and uncertainties and actual results may differ materially from those presented, either expressed or implied, in this press release. Factors that might cause such differences include, but are not limited to: the Company’s ability to successfully execute its business plans and achieve its objectives; changes in general economic and financial market conditions, either internationally, nationally or locally in areas in which the Company conducts its operations, including changes in securities markets and valuations in structured securities and other assets; changes in governmental policies and programs resulting from general economic and financial market conditions; changes in interest and funding rates; continuing consolidation in the financial services industry; new litigation or changes in existing

litigation; increased competitive challenges and expanding product and pricing pressures among financial institutions; legislation or regulatory changes which adversely affect the Company’s operations or business (including the Dodd-Frank Wall Street Reform and Consumer Protection Act); and changes in accounting policies, procedures or determinations as may be required by the Financial Accounting Standards Board or other regulatory agencies.

Additional factors that could cause actual results to differ materially from those expressed in the forward-looking statements are discussed in Zions Bancorporation’s most recent Annual Report on Form 10-K and Quarterly Reports on Form 10-Q for the quarters ended March 31, 2010 and June 30, 2010 filed with the Commission and available at the Commission’s Internet site (http://www.sec.gov).

Except as required by law, the Company specifically disclaims any obligation to update any factors or to publicly announce the result of revisions to any of the forward-looking statements included herein to reflect future events or developments.

About Zions

Zions Bancorporation is one of the nation’s premier financial services companies, consisting of a collection of great banks in select high growth markets. Zions operates its banking businesses under local management teams and community identities through approximately 500 offices in ten Western and Southwestern states: Arizona, California, Colorado, Idaho, Nevada, New Mexico, Oregon, Texas, Utah and Washington. The Company is a national leader in Small Business Administration lending and public finance advisory services. In addition, Zions is included in the S&P 500 and NASDAQ Financial 100 indices.

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