EXHIBIT 99

                            CERTIFICATION PURSUANT TO
                             18 U.S.C. SECTION 1350,
                             AS ADOPTED PURSUANT TO
                  SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Glacier Bancorp, Inc. (the "Company") on
form 10-K for the period ended December 31, 2002, as filed with the Securities
and Exchange Commission on the date hereof (the "Report"), we, Michael J.
Blodnick, President and Chief Executive Officer, and James H. Strosahl,
Executive Vice President and Chief Financial Officer, of Glacier Bancorp, Inc.,
certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906
of the Sarbanes-Oxley Act of 2002, that:

         (1)      The Report fully complies with the requirements of Section
                  13(a) or 15(d) of the Securities Exchange Act of 1934 (15
                  U.S.C. 78m or 78o(d)); and

         (2)      The information contained in the Report fairly presents, in
                  all material respects, the financial condition and results of
                  operations of the Company.

                                                    March 14, 2003

                                                    /s/ Michael J. Blodnick
                                                    -----------------------
                                                    Michael J. Blodnick
                                                    President/CEO

                                                    /s/ James H. Strosahl
                                                    ---------------------
                                                    James H. Strosahl
                                                    Executive Vice President/CFO