--------------------------
                                                             OMB APPROVAL 
                                                    --------------------------
                                                    OMB Number 3235-0058 
                                                    Expires: March 31, 2006 
                                                    Estimated average burden 
                                                    hours per response ...2.50
                                                    --------------------------
                                                           SEC FILE NUMBER 
                                                                0-23333
                                                    --------------------------
                                                            CUSIP NUMBER 
                                                             887098 10 1
                                                    --------------------------

                               UNITED STATES 
                    SECURITIES AND EXCHANGE COMMISSION 
                          WASHINGTON, D.C. 20549 
                                
                                FORM 12B-25 
                                
                        NOTIFICATION OF LATE FILING 

(Check One): [ ] Form 10-K [ ] Form 20-K [x] Form 10-Q [ ] Form N-SAR [ ] Form
             N-CSR 
             For Period Ended: March 31, 2005 
             [ ] Transition Report on Form 10-K 
             [ ] Transition Report on Form 20-K 
             [ ] Transition Report on Form 11-K 
             [ ] Transition Report on Form 10-Q 
             [ ] Transition Report on Form N-SAR 
             For the Transition Period Ended: _____________________________ 

==============================================================================
 READ ATTACHED INSTRUCTION SHEET BEFORE PREPARING FORM. PLEASE PRINT OR TYPE.
Nothing in this form shall be construed to imply that the Commission has
verified any information contained herein. 
==============================================================================

If the notification relates to a portion of the filing checked above, identify
the item(s) to which the notification relates: 
------------------------------------------------------------------------------ 

PART I - REGISTRANT INFORMATION 

Timberland Bancorp, Inc.
------------------------------------------------------------------------------ 
Full Name of Registrant 

N/A 
------------------------------------------------------------------------------ 
Former name if applicable 

624 Simpson Avenue 
------------------------------------------------------------------------------ 
Address of Principal Executive Office (Street and Number) 

Hoquiam, Washington 98550
------------------------------------------------------------------------------ 
City, State and Zip Code 

PART II - RULES 12b-25 (b) AND (c) 

If the subject report could not be filed without unreasonable effort or
expense and the registrant seeks relief pursuant to Rule 12b-25(b), the
following should be completed. (Check box if appropriate.) 

      (a) The reasons described in reasonable detail in Part III of this form
          could not be eliminated without unreasonable effort or expense; 

[X]   (b) The subject annual report, semi-annual report, transition report on
          Form 10-K, 20-F, 1-K, Form N-SAR or Form N-CSR, or portion thereof
          will be filed on or before the fifteenth calendar day following the
          prescribed due date; or the subject quarterly report or transition
          report on Form 10-Q, or portion thereof will be filed on or before
          the fifth calendar day following the prescribed due date; and 

      (c) The accountant's statement or other exhibit required by Rule
          12b-25(c) has been attached if applicable. 

PART III - NARRATIVE 

State below in reasonable detail why the Form 10-K, 20-F, 11-K, 10-Q, N-SAR,
N-CSR or the transition report portion thereof could not be filed within the
prescribed time period. 

     The registrant, as an accelerated filer, did not realize that it was
     required to file its Form 10-Q within 40 days after the end of the
     quarter, instead of 45 days. 





PART IV - OTHER INFORMATION 

(1) Name and telephone number of person to contact in regard to this
    notification: 

    Dean J. Brydon                  (360)                 533-4747
    ------------------          --------------    -------------------------- 
          (Name)                 (Area Code)         (Telephone Number) 

(2) Have all other periodic reports required under Section 13 or 15 (d) of the
    Securities Exchange Act of 1934 or Section 30 of the Investment Company
    Act of 1940 during the preceding 12 months or for such shorter period that
    the registrant was required to file such report(s) been filed? If the
    answer is no, identify report(s).         [ ] Yes [X] No   (Form 10-Q for
                                                                12/31/04)

------------------------------------------------------------------------------ 
(3) Is it anticipated that any significant change in results of operations
    from the corresponding period for the last fiscal year will be reflected
    by the earnings statements to be included in the subject report or portion
    thereof?
                                              [ ] Yes [X] No 

If so: attach an explanation of the anticipated change, both narratively and
quantitatively, and, if appropriate, state the reasons why a reasonable
estimate of the results cannot be made. 

==============================================================================

                       TIMBERLAND BANCORP, INC.
             --------------------------------------------
             (Name of Registrant as Specified in Charter) 

has caused this notification to be signed on its behalf by the undersigned
thereunto duly authorized. 

Date: May 10, 2005                     By: /s/ Dean J. Brydon
      --------------------             -------------------------- 
                                       Dean J. Brydon, Chief Financial Officer


                                    2