Climate change affects numerous aspects of our lives, and as such it requires many laws and government plans involving multiple ministries. This study focused on such intricate government policies and carried out a meta-assessment on them in order to strengthen the nation’s preparedness for impacts from climate change. We selected five mid-to-long-term master plans based on the centrality of the corresponding legal text, and four policy areas based on the focused group interview results. This study was based on the meta-assessment methodology developed by NAFI in 2019 for analyzing mid-to-long-term government plans, and we tailored the methods to assess the plans in relation to climate change and policies included in the plans. The meta-assessment methodology that we present here aimed to evaluate the relevance, fidelity, and feasibility of the climate change plans. Our meta-assessment on the policy level further employed evaluation criteria on the consistency between interconnected government plans and laws. The results and findings from these assessment processes uncovered substantial problems in the laws and plans related to climate change, and we made several suggestions for amendments.