Fire is one of the major factors in landscape transformation, particularly forest ones. The fire risk mapping, used to determine which areas are susceptible to start a forest fire, aims to address some strategies against fire and raise the discussion about the importance of preventing fire in conservation units. Six thematic images were used for the development of the risk map of the Monumento Natural Serra dos Mascates representing: land use and cover, altimetry, slope, slope orientation and proximity to the urban center, as well as its access (roads and trails). All images were reclassified to the same class and superimposed using a risk coefficient. The final overlay reclassified the areas with High risk to the edges of the urban area and access roads, highlighting the influence of human activity on the risk of the ignition.