US states must have a FEMA-approved state hazard mitigation plan (SHMP) to apply for certain nonemergency disaster funds and funding for mitigation projects. SHMPs indentify the hazards that may impact a state and detail corresponding mitigation strategies. This report assesses the treatment and definition of heat as a hazard in each state's most recent plan. The importance of extreme heat—the leading cause of weather-related death in the United States—is often understated because it does not fit easily into current SHMP guidelines. The authors provide recommendations to help states adequately evaluate the threat of extreme heat as they update their SHMPs.