CB Announces 1Q Earnings Release Date

April 11, 2011


JoAnne Coy, Vice President,
Corporate Communications
253-305-1965; jcoy@columbiabank.com



TACOMA, Washington--- Columbia Banking System, Inc. (NASDAQ: COLB) expects to report first quarter 2011 financial results on Wednesday, April 27, 2011, just prior to the Company’s Annual Meeting, which is scheduled for 1:00 p.m. PDT that day.   Management will discuss these results on a conference call scheduled for the following day, Thursday, April 28, 2011 at 1:00 p.m. PDT (4:00 p.m. EDT).     Interested parties may listen to this discussion by calling 1-866-378-3802; Conference ID code #59172268.   

A conference call replay will be available from approximately 4:00 p.m. PDT on April 28, 2011 through midnight PDT on May 3, 2011.  The conference call replay can be accessed by dialing 1-800-642-1687 and entering Conference ID code #59172268.


About Columbia       

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is the holding company of Columbia Bank, a Washington state-chartered full-service commercial bank which was awarded third place in the large employer category by Seattle Business Magazine’s 100 Best Companies to Work For 2010 and was designated one of  Puget Sound Business Journal’s “Washington’s Best Workplaces 2010”. 

Columbia Banking System has 85 banking offices, including 60 branches in Washington State and 25 branches in Oregon. Columbia Bank does business under the Bank of Astoria name at branches located in Astoria, Warrenton, Seaside, Cannon Beach, Manzanita and Tillamook. More information about Columbia can be found on its website at www.columbiabank.com.


Note Regarding Forward Looking Statements

This news release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which can be identified by words such as “may,” “expected,” “anticipate”, “continue,” or other comparable words.  In addition, all statements other than statements of historical facts that address activities that Columbia expects or anticipates will or may occur in the future are forward-looking statements.  Readers are encouraged to read the SEC reports of Columbia, particularly its form 10-K for the Fiscal Year ended December 31, 2010, for meaningful cautionary language discussing why actual results may vary materially from those anticipated by management.