The answer to 'why is my fire ant trails' is that fire ants are building their nests and foraging trails. Fire ants are a common pest that can quickly establish large colonies in lawns and gardens. Their trails are created as the ants travel between their nest and food sources, leaving behind a pheromone scent that other ants follow.
Fire ant trails are often visible as narrow, winding paths leading to and from the nest mound. They may also appear as a network of trails across the yard as the colony expands. Seeing these trails is a clear sign of a fire ant infestation that needs to be addressed.