Teacher federations are often criticized as "roadblocks" to educational change. It is arguable, however, that their advocacy work has been paramount in securing safer return to school conditions across Canadian Educational jurisdictions. Utilizing Carter et al. (2010) framework of union responses to changing policy environments, this paper draws on publicly available documents and social media posts from March through to October of 2020 to examine the ways in which teacher unions in various Canadian contexts have responded to the issue of school reopening plans amid the COVID-19 pandemic. In particular, the paper analyzes the extent to which Canadian teacher unions have been able to move into the realm of union renewal as a means of building internal capacity and developing external networks to strengthen their public advocacy work.