During the 2012-13 school year, there were a total of 588 students attending classes in Sumiswald. There were a total of 103 students in the German language kindergarten classes in the municipality. Of the kindergarten students, 13.6% were permanent or temporary residents of Switzerland (not citizens) and 18.4% have a different mother language than the classroom language. The municipality's primary school had 294 students in German language classes. Of the primary students, 4.8% were permanent or temporary residents of Switzerland (not citizens) and 12.9% have a different mother language than the classroom language. During the same year, the lower secondary school had a total of 191 students. There were 3.7% who were permanent or temporary residents of Switzerland (not citizens) and 11.0% have a different mother language than the classroom language.