The council has the unique feature in Switzerland of convening in two different locations: the town hall of Frauenfeld in the summer and that of Weinfelden in the winter.

[1] The Grand Council was created in 1803 by the Act of Mediation, which established Thurgau as a Swiss canton.

[1] The cantonal constitution of 1831 introduced a system of two annual sessions, one taking place in Frauenfeld in the winter and the other in Weinfelden in the summer.

In 1869, a new cantonal constitution made the number of seats dependent on the size of the population and shortened the parliamentary term to three years.

[3][4] For the elections of 15 March 2020, the number of seats per district was 27 for Arbon, 32 for Frauenfeld, 23 for Kreuzlingen, 22 for Münwilen and 26 for Weinfelden.