This chapter reframes risk assessment in social work for a climate-altered world. Social workers are already familiar with evaluating risk, but our tools were built for a more stable reality: harm to children, elder safety, neglect, and violence. Climate change amplifies every existing vulnerability and creates new ones. As extreme heat, flooding, displacement, food insecurity, energy failure, and service breakdowns become more frequent, demand for support will rise while capacity is strained. That means the old thresholds for intervention may no longer hold, and the definition of “vulnerable” will have to change. The chapter offers a practical approach to climate-informed risk assessment. It argues that vulnerability is not only about individual factors but about exposure to climate threats and our levels of dependence on fragile systems. It provides a method for mapping community-level risk and a frontline checklist for heat, flood, cold, food access, and isolation. Through realistic scenarios, it shows how social workers can anticipate harm and act before a crisis becomes acute.