This article reports on an English for academic purposes course designed following the tenets of content and language integrated learning (CLIL) to address the needs of language minority (LM) high school graduates entering Canadian universities. The language used in and required of post-secondary study is challenging for many LM students, particularly those with marginal English language arts grades, contributing to a difficult transition into university. The goal of this course was to improve academic English language skills to mitigate this transition; academic language skills and strategies were embedded, and the content and materials mimicked mainstream university courses. To determine what, if any, vocabulary gains took place during the course, data from pre-/post-testing and writing samples of the ten consenting participants were analyzed using t-tests. These data consisted of lexical measurement tools including the Gates MacGinitie Test of Reading (Vocab) and the Productive Academic Word Test, along with writing analysis using TAALEs and Lextutor software to evaluate lexical sophistication. Each measurement indicated vocabulary gains occurred during the six-week CLIL course. Qualitative examples of student work are provided, and subsequent academic performance of participants is presented. This research concludes with recommendations for future research and CLIL implementation in higher education.