This guidebook is designed to support efforts to initiate and integrate climate planning within county, regional and tribal public health departments and agencies. It will provide you and your department with the knowledge and skills to build capacity to address climate impacts and/or develop a climate action plan for your department. The strategies and activities will enhance your efforts to both reduce greenhouse gas emissions and to prepare for impacts. By working through the guidebook and activities over the next six months to a year, you can build sustained institutional capacity to manage the health impacts of climate change. An individual can complete the guidebook and associated activities independently. However, adoption and integration of the recommendations by your department is likely to be more effective when the guidebook is completed in partnership with, or at least with support from, organizational leadership. The guidebook is divided into four sections: Section One provides an overview of the impacts of climate change on public health; Section Two discusses opportunities and strategies for integrating climate planning across programs; Section Three focuses on identifying and building unique external collaborations to help you meet your goals in a resource-efficient way; and Section Four provides recommendations for communicating with different stakeholders. Because we have found that a climate mitigation or adaptation process must meet the unique needs (and constraints) of the community, sector, or department for which its being developed, we do not provide a step-by-step methodology for climate planning. Instead, this guidebook is intended to supplement planning efforts and provide strategies to build support for action among colleagues and within your community. For additional support on climate planning, please refer to Appendices A and B.