Forests are complex ecosystems. They are constantly changing as a result of tree growth, variations in weather and climate, and disturbances from fire, pathogens, and other stressors. The USDA Forest Service Forest Health Monitoring (FHM) program tracks these ongoing changes — every year, across the nation — as a forest health check up. The 2018 FHM report is the only national summary of forest health undertaken on an annual basis. It contains short- and long-term forest health assessments for the continental U.S., Alaska, Hawaii, Puerto Rico, and the U.S. Virgin Islands. The report is available as a General Technical Report. Individual chapters can be downloaded, and the full series of FHM annual reports is also available. Users can search reports and chapters by year or topic. Highlights and additional resources are also included.