In 2020, Grass Valley School District (GVSD) engaged in the Preschool through third grade Coherence Collaboration (P3CC) with California Education Partners, focusing on improving literacy instruction. Over 3 years, the GVSD P3CC team implemented new literacy assessments and instructional practices, particularly in phonics instruction. The collaboration's approach emphasized teacher leadership, internal accountability, and the strategic use of data, which shifted the district's culture towards one more conducive to continuous improvement. By the end of the 3-year collaboration, GVSD had successfully spread its literacy initiatives districtwide and improved student outcomes. GVSD needs to further develop its system for instructional improvement despite these gains, particularly in building adult capacity and ensuring sustainable leadership and collaboration structures.