Climate action plans (CAPs) are robust policy tools that outline the future of a community in the face of climate change. Research and focused case studies of Fort Collins, Colorado and Miami, Florida reveal that taking climate action can contribute to the growth of the green economy, avoid future losses in GDP, and reduce avoidable deaths due to air pollution and extreme heat. The economic costs are personnel and budget for creation and implementation, as well as the cost of shifting industries. By outlining small steps and quantifying savings for each initiative, cities can clear ambiguity and gain support for CAPs.