MDU Resources Group, Inc. (NYSE:MDU) will webcast its third quarter 2007 earnings release conference call October 23 following the release of its results. Presenting the earnings results and guidance will be MDU Resources’ President and Chief Executive Officer Terry D. Hildestad and Executive Vice President, Treasurer and Chief Financial Officer Vernon A. Raile.

The webcast will begin at 1 p.m. EDT and can be accessed at www.mdu.com. A webcast replay and audio replay will be available. The dial-in number for audio replay is (800) 642 1687 or for international callers, (706) 645-9291, conference ID 18791439.

MDU Resources Group, Inc., a member of the S&P MidCap 400 index, provides value-added natural resource products and related services that are essential to energy and transportation infrastructure, operating in three core lines of business; Energy, Construction Materials and Utility Resources. MDU Resources includes natural gas and oil production, natural gas pipelines and energy services, construction materials and mining, construction services, and electric and natural gas utilities. For more information about MDU Resources, see the company's Web site at www.mdu.com or contact the Investor Relations Department at investor@mduresources.com.


Contact:
   Phyllis A. Rittenbach
   Director of Investor Relations
   (701) 530-1057