The ruling People's Party (PP) sustained a sharp decline in its support, with a decrease of almost fourteen percentage points in the vote share and falling short of an overall majority for the first time since 1987.

The election result forced the PP candidate and incumbent regional president Juan Vicente Herrera to secure the support of C's in order to be re-elected for a fifth term in office, which would also end up being his last.

[1] Voting for the Cortes was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered in Castile and León and in full enjoyment of their political rights.

[2] All members of the Cortes of Castile and León were elected using the D'Hondt method and a closed list proportional representation, with an electoral threshold of three percent of valid votes—which included blank ballots—being applied in each constituency.

The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.

The table below lists opinion polling on the victory preferences for each party in the event of a regional election taking place.

The table below lists opinion polling on the perceived likelihood of victory for each party in the event of a regional election taking place.