There is ample evidence that human actions are continuously and progressively straining planetary processes and systems vital for the wellbeing of the planet, as well as people themselves (WWF, 2012, 2014). Education has a key role to play in addressing these challenges. The role of technical and vocational education and training (TVET) in addressing these challenges has also been recognized. However, little is understood about the preparedness of TVET educators, specialists in their vocational areas, to address environmental and sustainability issues. This action research study examines the relationship between educator ecoliteracy and educator ability to develop and deliver vocationally specific sustainability education, in a single TVET college in Canada. The research study was undertaken over a 3-year period and involved 43 participants in total. Findings indicate that educators’ ecological knowledge, their collegial relationships and institutional processes are all significant in supporting attempts to revise vocational curriculum. Professional learning to improve vocational educators’ ecoliteracy requires more than deepening ecological knowledge, however. Also required is an understanding of the science of contemporary ecological issues and the relationship of those issues to broader socio-cultural and economic activities. In order to consider curriculum revision, educators thus need to personally value and prioritize such education as essential to the development of vocational competency amongst their students. Improving the ecoliteracy of the educator community, therefore, requires more than simply developing knowledge and skill in the scientific language of ecology; it also requires opportunities for educators to participate in institutional sustainability policies and practices