The linkage between reading for pleasure and language ability has been well established, but the relationship between content-based recreational reading and academic achievement in various subject areas has rarely been explored. To investigate whether reading literature, social studies, and science trade books for pleasure is related to students' growth in achievement for the subjects of Chinese, social studies, and science, respectively, this study used data from 4,730 students at a Taiwanese girls' high school. Based on students' high school entrance exam test scores in three subject areas as control variables, and their college entrance exam scores as the outcomes, the findings indicated that pleasure reading in a specific content area might lead to growth in achievement for that particular content area, and in some cases, reading in other content areas might help as well. A reading program that invites students to engage in self-sponsored reading can promote disciplinary literacy and academic achievement.