Opinion polling for the Norwegian parliamentary election, 2009 Average polling By month

| Party | Result_Parliam_election_2005 | Result_County_elections_2007 | Aug_2008 | Sep_2008 | Oct_2008 | Nov_2008 | Dec_2008 | Jan_2009 | Feb_2009 | Mar_2009 | Apr_2009 | May_2009 | Jun_2009 | Jul_2009 | Aug_2009 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Labour | 32.7% | 30.8% | 26.5% | 29.0% | 30.6% | 31.4% | 30.7% | 33.9% | 34.2% | 32.8% | 32.5% | 32.9% | 32.9% | 33.1% | 32.4% |
| Progress | 22.1% | 18.5% | 30.8% | 29.6% | 26.5% | 24.2% | 23.7% | 23.2% | 24.1% | 27.3% | 27.0% | 26.4% | 26.0% | 28.2% | 25.7% |
| Conservative | 14.1% | 18.8% | 16.3% | 15.4% | 16.1% | 15.9% | 17.4% | 16.1% | 15.1% | 13.8% | 13.9% | 13.8% | 13.5% | 12.9% | 13.8% |
| Socialist Left | 8.8% | 6.5% | 6.7% | 6.5% | 7.3% | 7.7% | 7.8% | 7.5% | 7.1% | 7.0% | 7.1% | 7.5% | 7.3% | 7.2% | 8.1% |
| Christian Democratic | 6.8% | 6.7% | 5.5% | 5.6% | 5.6% | 6.6% | 6.3% | 6.0% | 6.0% | 6.2% | 6.0% | 6.0% | 5.8% | 5.9% | 6.1% |
| Centre | 6.5% | 7.8% | 5.2% | 5.0% | 5.3% | 5.5% | 5.7% | 5.5% | 4.9% | 5.5% | 5.8% | 5.0% | 5.8% | 5.1% | 5.6% |