Climate change and sustainable development are strongly linked. The poor and least developed countries are the most vulnerable, and will be most adversely affected and also the least able to cope with the impacts of climate-related disasters. The United Nations Sustainable Development Goal (SDG) 13 – Climate Action – aims to strengthen every country’s adaptive capacity and resilience to climate change-related natural disasters and hazards. It also aims to improve awareness[1]raising, education and institutional and human capacity on mitigation, impact reduction, early warning and adaptation to climate change (MDG Monitor, 2016). Farmer field schools (FFS) have long been used to enhance critical thinking and informed decision making by local communities through testing innovative solutions to improve production and livelihoods. The FFS process empowers individuals, households and communities with skills they can apply to solving problems in production as well as other broader challenges that confront them such as those brought about by climate change. FFS can make a major contribution towards building rural communities’ adaptive capacity for mitigating risks relating to impact of climate change and achieving SDG 13 – Climate Action. The Food and Agriculture Organization of the United Nations (FAO) developed this guidance note to assist FFS master trainers and facilitators bring about climate change adaptation in FFS. The guide provides key information on how the climate is changing, and how these changes are impacting the agricultural (crops and livestock), aquaculture and agroforestry systems of smallholder farmers. The note provides guidance to FFS practitioners so that they can better work with individual farmers and communities – using a “climate change lens” – in identifying, testing and adapting new practices that respond to changes and variability in local weather. The guide is not intended as a textbook on climate change but is prepared for easy understanding of basic concepts of climate change to support the interpretation of climate information in specific farming contexts and steps that FFS facilitators “must know” in starting FFS programmes that respond to climate change challenges