This exploratory study presents an example of how a historical contextualization framework can be used to develop and implement a lesson unit on Cold War events. The effects of the lesson unit on students' ability to perform historical contextualization are explored in a quasi-experimental pre-test--post-test design with an experimental (n = 96) and a control (n = 73) condition. The students' answers on a historical contextualization test were analysed. The results indicate that students in the experimental condition increased their ability to perform historical contextualization and displayed less present-oriented perspectives in their answers compared to students in the control condition.