This report details the story of the Race to the Top - Early Learning Challenge (RTT-ELC) Grant in Washington for the period of 2012-2016. It provides detailed reflections on the state's accomplishments over the grant period, shares the enhanced vision for the RTT-ELC in Washington, and provides specific details about what has changed in the state and in early learning programs as a result of RTT-ELC. The report also provides lessons learned in implementing a comprehensive reform and reporting agenda and shares specific planned next steps for this work as the state moves ahead. Washington has five approved projects to accomplish this work within the Race to the Top-Early Learning Challenge (RTT-ELC) Grant, and made considerable progress across each of these areas: (1) Project 1: Grants Management; (2) Project 2: TQRIS Expansion; (3) Project 3: TQRIS Infrastructure; (4) Project 4: WaKIDS Kindergarten Entry Assessment (KEA); and (5) Project 5: Professional Development Incentives. RTT-ELC was instrumental in allowing Washington to build the capacity to support a high-quality early learning system at scale. In addition to ramping up services, it enabled much needed evaluation, assessment, and adjustments to the system that has led to a more mature and thoughtful system. The grant allowed Washington to take risks, learn lessons, and make revisions that would have been challenging without a federal funding source. In 2015, the Washington Legislature passed the Early Start Act (ESA) which enabled Washington to build upon the work of RTT-ELC and sustain and improve the high-quality system that was built with RTT-ELC funds. Importantly, it also made participation in Early Achievers, Washington's Tiered Quality Rating and Improvement System (TQRIS) system, mandatory for all providers that accept state subsidy payments, as well as for providers offering the Early Childhood Education and Assistance Program (ECEAP), Washington's comprehensive pre-kindergarten (pre-k) program. These providers must attain levels of high-quality within a specific timeline.