The Canadian City of Toronto’s progress is evaluated for the implementation of its climate action plan, TransformTO, and its effectiveness in reducing sectoral emissions. Following a brief history of climate action in Toronto, the key climate policies and programs are subjected to a content analysis and assessed using an aggregate evaluation framework composed of qualitative indicators commonly used to track municipal climate action. The results of this assessment reveal that the city has made steady progress in reducing emissions, surpassing its 2020 greenhouse gas emissions reduction target of 30% reduction below 1990 levels. However, Toronto is not on track to meet its 2030 target of a 65% emissions reduction from 1990 levels. Without transformational action across all sectors, it is unlikely to meet the 2030 and 2040 targets. The results are intended to strengthen implementation and evaluation efforts in Toronto. The discussion will be of interest to decision-makers and practitioners who seek to accelerate implementation of municipal climate action plans.