CB Announces 4Q & 2012 Earnings Release Date

Columbia Banking System Announces Fourth Quarter & Year 2012
Earnings Release Date and Conference Call

Columbia Banking System, Inc. expects to report fourth quarter and full year 2012 financial results on Thursday, January 24, 2013 at 5:00 a.m. PST. Management will discuss these results on a conference call scheduled for that afternoon at 1:00 p.m. PST (4:00 p.m. EST). Interested parties may listen to this discussion by calling 1-866-378-3802; Conference ID code #86908552.

A conference call replay will be available from approximately 4:00 p.m. PST on January 24, 2013 through midnight PST on January 31, 2013. The conference call replay can be accessed by dialing 1-855-859-2056 and entering Conference ID code #86908552.