The outgoing Spanish Socialist Workers' Party (PSOE) administration suffered a serious defeat after losing nearly 30% of its 2007 vote. The then-oppositor People's Party (PP) obtained the best result of its history in the region, despite remaining 4 seats short for an absolute majority of seats. This was also the first time since the 1999 election that the PP had received the most votes in Aragon. United Left (IU) had its best result since 1995, gaining 3 seats for a total of 4. The Aragonese Party (PAR), on the other hand, obtained its worst historical result, while the Aragonese Union (CHA) remained static at its 2007 result.
As a result of the election, Luisa Fernanda Rudi from the People's Party was elected President of Aragon as part of a PP-PAR coalition agreement. The PAR had been previously the PSOE coalition partner from 1999 to 2011.
The number of seats in the Aragonese Courts was set to a fixed-number of 67. All Courts members were elected in 3 multi-member districts, corresponding to Aragon's three provinces, using the D'Hondt method and a closed-listproportional representation system. Each district was entitled to an initial minimum of 13 seats, with the remaining 28 seats allocated among the three provinces in proportion to their populations, on the required condition that the number of inhabitants per seat in each district did not exceed 2.75 times those of any other. For the 2011 election, seats were distributed as follows: Huesca (18), Teruel (14) and Zaragoza (35).
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. 34 seats were required for an absolute majority in the Aragonese Courts.
^ abPoll results are shown projected over candidacy votes (that is, votes going for political parties, excluding blank ballots). The vote percentage in the official election is calculated including blank ballots into the estimation. In order to obtain data comparable to both the official results as well as those of other polls, a rule of three has been applied to the poll projections, with the results of the calculation being shown instead.