Objective This study examines Ronald Inglehart's theory of value change in the Supreme Court of Canada. The theory has received little attention in the public law literature, yet its central tenet suggests that intergenerational value change might influence the way that Supreme Court justices decide cases over time. Method Using a socio‐attitudinal model of judicial behavior, the study analyzes all environmental decisions between 1973 and 2010. Case outcomes are coded as either pro‐environmental (1) or anti‐environmental (0). Logistic regression analysis examines whether Court tenures, case facts, and judge‐level variables have a significant impact on predicting a postmaterialist outcome. Results We find evidence of postmaterialist, pro‐environmental value change, with more contemporary justices exhibiting pro‐environmental positions, even in the face of rival variables. Conclusion Our results suggest that intergenerational value change has influenced decision making in Canadian environmental cases over the last 40 years, and indicate the theory may have relevance for explaining other high court change over time in a postmaterialist direction.