This paper explores how development agencies are integrating climate action into development portfolios in response to calls to scale-up climate engagements in alignment with both the Sustainable Development Goals and the Paris Agreement. Using data compiled on all 30 members of the Organisation for Economic Co-operation and Development’s Development Assistance Committee (OECD-DAC), this paper maps and analyzes trends in both the scale and usage of official development assistance allocated to support climate activities and the tools and approaches used to integrate climate across development activities. This paper shows that while climate has become a key priority for development agencies, there remains scope for deepening integration by improving monitoring and reporting of climate and development results, integrating climate considerations across the life cycle of projects, and searching for complementarities across agencies.