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                UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K


                                 CURRENT REPORT


               PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES
                              EXCHANGE ACT OF 1934


         DATE OF REPORT (DATE OF EARLIEST EVENT REPORTED) JUNE 3, 2005


                           MDU RESOURCES GROUP, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


         DELAWARE                    1-3480                      41-0423660

(STATE OR OTHER JURISDICTION       (COMMISSION                (I.R.S. EMPLOYER
      OF INCORPORATION)            FILE NUMBER)              IDENTIFICATION NO.)


                               SCHUCHART BUILDING
                             918 EAST DIVIDE AVENUE
                                 P.O. BOX 5650
                       BISMARCK, NORTH DAKOTA 58506-5650
                    (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)
                                   (ZIP CODE)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (701) 222-7900


CHECK THE APPROPRIATE BOX BELOW IF THE FORM 8-K FILING IS INTENDED TO
SIMULTANEOUSLY SATISFY THE FILING OBLIGATION OF THE REGISTRANT UNDER ANY OF THE
FOLLOWING PROVISIONS:

|_|  WRITTEN COMMUNICATIONS PURSUANT TO RULE 425 UNDER THE SECURITIES ACT
     (17 CFR 230.425)
|_|  SOLICITING MATERIAL PURSUANT TO RULE 14a-12 UNDER THE EXCHANGE ACT
     (17 CFR 240.14a-12)
|_|  PRE-COMMENCEMENT COMMUNICATIONS PURSUANT TO RULE 14d-2(b) UNDER THE
     EXCHANGE ACT (17 CFR 240.14d-2(b))
|_|  PRE-COMMENCEMENT COMMUNICATIONS PURSUANT TO RULE 13e-4(c) UNDER THE
     EXCHANGE ACT (17 CFR 240.13e-4(c))


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ITEM 8.01. OTHER EVENTS.

     On June 3, 2005, MDU Resources Group, Inc. (the "Company") issued a press
release reaffirming the Company's 2005 earnings per share guidance of $1.80 to
$2.00 and providing updated information on its coalbed natural gas production
program for 2005. A copy of the press release is incorporated by reference
herein and is attached as Exhibit 99.

ITEM 9.01. FINANCIAL STATEMENTS AND EXHIBITS.

     (c)  Exhibits

          99   Press release issued June 3, 2005


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                                   SIGNATURE

     Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.


                                         MDU RESOURCES GROUP, INC.

Date  June 3, 2005                       BY  /s/ Warren L. Robinson
     ---------------------------             ----------------------------
                                             Warren L. Robinson
                                             Executive Vice President and
                                               Chief Financial Officer


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                                 EXHIBIT INDEX

Exhibit Number             Description of Exhibit
--------------             ----------------------

     99                    Press release issued June 3, 2005


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