NW Natural Schedules Conference Call to Review Financial Results for Quarter and Year-to-Date Periods Ending September 30, 2008

Northwest Natural Gas Company (NYSE:NWN), dba NW Natural, announced today that it will issue its quarterly earnings release on Tuesday, Nov. 4, 2008, for the three-month and year-to-date periods ending Sept. 30, 2008.

NW Natural will conduct a conference call and webcast starting at 8 a.m. Pacific Time (11 a.m. Eastern Time) on Nov. 4, 2008, to review the company’s third quarter and nine-month financial results.

To hear the conference call live, please dial 1-800-860-2442 from anywhere in the United States, and 1-412-858-4600 from international points, including Canada. To access the recording, please call 1-877-344-7529 and enter the conference identification pass code (424156#). To hear the replay from international locations, please dial 1-412-317-0088.

To hear the conference by webcast, log on to NW Natural’s corporate website at www.nwnatural.com or through www.InvestorCalendar.com.

About NW Natural

NW Natural is headquartered in Portland, Ore., and serves approximately 657,000 residential and business customers in Oregon and Southwest Washington. It is the largest independent natural gas utility in the Pacific Northwest. The company has approximately $2.0 billion in total assets, which includes about 16 Bcf of underground gas storage capacity within its service territory at Mist, Ore.