The Year 2 Preschool Expansion Grant (PEG) implementation study focuses on the second year of supports and outcomes for teachers, classroom quality, and supports for families. Overall, compared to its first year of implementation, the PEG programs in Year 2 (which was the 2016-17 school year) appear to have made progress towards delivering the key quality components of the PEG model at a consistently high level across all 48 classrooms. After introducing the PEG program (Chapter 1), this report describes the second year of supports and outcomes for teachers (Chapters 2 and 3), classroom quality (Chapter 4), supports for families (Chapter 5), and concludes with a discussion of overall implementation progress in Year 2 and next steps for Year 3 (Chapter 6). In addition to describing the level of implementation of key PEG quality components, Chapters 2 and 5 also note changes in implementation progress or strategy from Year 1 to Year 2, and the extent to which programs were able to address challenges identified in Year 1 during Year 2. Taken together, this report provides EEC and the larger PEG community with an important opportunity to learn from implementation successes and challenges experienced by the PEG program over the past year and can inform policy and programmatic decisions about further expansion of high-quality state-funded preschool. [This report was written with the assistance of Kerry Hofer and Rian Watt. To view Year 1 of the evaluation report, see ED582097.]