In fall 2018, the Nevada Department of Education (NDE), in collaboration with Nevada’s Positive Behavior Interventions and Supports (PBIS) Technical Assistance (TA) Center, was awarded a second five-year federally funded School Climate Transformation Grant (SCTG). Funded through this grant, the Nevada MTSS project seeks to improve its capacity to establish, scale-up, and sustain multi-tiered behavioral frameworks in Nevada’s schools by implementing Schoolwide Positive Behavior Support (SWPBS). This report presents program evaluation findings for Year 4 (2022–23) of the grant and the third year of full implementation.