Exploratory scenario planning (XSP) can help communities prepare for uncertainties posed by climate change, automation, and other unprecedented 21st-century challenges. This manual is a comprehensive resource for anyone interested in using this emergent planning approach, which is effective at the local, regional, or organizational level. Through the XSP process, stakeholders envision and develop various potential futures (i.e., scenarios) and consider how to measure and prepare for each, rather than working toward a single shared vision for the future. Through instructive case studies, recommendations, sample workshop agendas, and more, this manual equips would-be practitioners with the background knowledge, procedural guidance, and practical strategies to implement this planning tool successfully. Readers will be prepared to facilitate—or even lead—an effective, impactful XSP process in their own settings.