Climate change intensifies the frequency and duration of warm and dry periods, thereby increasing the risk of forest fires. These changing climatic conditions affect forest flammability by altering vegetation structure, species composition, and fuel moisture levels. As a result, forests are becoming increasingly vulnerable to fire disturbances, which pose a threat to ecosystem stability and carbon storage. This study analyzes natural forest flammability and its changes over the past decade in Lithuania. Forest flammability depended on stand species composition, stand age, forest type and management regime. The forests with the most dangerous natural flammability, classified as Class I, are concentrated in the flammable pine forests of southeastern and southwestern Lithuania. Although the proportion of Class I forests (with the highest natural flammability) decreases as stand age increases, and the area of Class II forests (with moderate flammability) expands, the projected increase in the frequency and intensity of warm and dry periods highlights the need for timely preventive measures to reduce forest fire risk.