The People's Party (PP) had formed the government of the region since the 1995 election, holding a majority of seats since then. As a result of the Spanish Socialist Workers' Party (PSOE) collapse at the national level, the PP increased its majority, gaining 3 seats and obtaining its best historical result in a regional election; the same 3 seats that were lost by the PSOE, which obtained its worst result ever. The Riojan Party (PR) held its 2 seats with a slightly reduced vote share.
Poll results are listed in the table below in reverse chronological order, showing the most recent first. The highest percentage figure in each polling survey is displayed in bold, and the background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. The lead column on the right shows the percentage-point difference between the two parties with the highest figures. Poll results use the date the survey's fieldwork was done, as opposed to the date of publication. However, if such date is unknown, the date of publication will be given instead.
Opinion polls showing seat projections are displayed in the table below. The highest seat figures in each polling survey have their background shaded in the leading party's colour. In the instance that there is a tie, then no figure is shaded. 17 seats were required for an absolute majority in the Parliament of La Rioja.