CB Announces 3Q Earnings Release Date

Columbia Banking System Announces Third Quarter 2013
Earnings Release and Conference Call Date

Columbia Banking System, Inc. (NASDAQ: COLB) expects to report third quarter 2013 financial results on Thursday, October 24, 2013 at 6:15 a.m. Pacific Daylight Time.  Management will discuss these results on a conference call scheduled for that afternoon 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 #85631067.