The target of accelerating stunting reduction includes the period from pregnancy to adolescence, where every period of life has the opportunity to correct past growth failures. This study aims to present the results of the evaluation of the implementation of the Regional Action Plan (RAD) policy to build a superior generation through the First 8000 Days of Life (HPK) in 2021–2025 Yogyakarta City. The method used in this study is a mix of quantitative and qualitative methods. Quantitative research is carried out with a cross-sectional design, including analysis of the health situation, related factors, and program achievements. Data sources are obtained from routine data report documents and other official websites. Data is analyzed in a descriptive way by presenting proportions, trends, narratives, tables, and figures. Meanwhile, qualitative research is carried out by designing rapid assessment procedures (RAP) through FGD and in-depth interviews and analyzed manually based on themes and sub-themes. The instruments of this research are an interview guide, FGD guide and a recorder. The results stated that the prevalence of stunting in Yogyarta City has decreased. Until the end of 2023, the evaluation of stunting reduction is carried out using indicators in accordance with Presidential Regulation 72 of 2021 concerning the acceleration of stunting reduction, but the evaluation with the indicators listed in RAD 8000 HPK has not been carried out comprehensively. Some factors that support the reduction in stunting prevalence are the commitment of regional leaders, good stunting governance, program achievement that is high or above the target, the human development index (HDI), and the high average length of schooling. Meanwhile, the inhibiting factors in reducing stunting are economic inequality, knowledge, community participation in Posyandu, littering behavior, and access to health insurance services for non-KTP residents of Yogyakarta City.