Passo Fundo is generally considered to be moderate in terms of safety for solo female travelers. Like any urban area, there are parts of the city that are safer than others. Common sense precautions such as not wandering alone at night, especially in less crowded or poorly lit areas, and always keeping a close eye on your belongings will go a long way in ensuring a safe trip. It is always advisable to inform someone about your whereabouts and plans. While most locals are friendly, it's important to stay alert and aware of your surroundings.