Nova Friburgo is generally safe for solo female travelers. Like any other destination, it's always important to exercise usual precautions. Although it has reasonably low crime rates, especially compared to larger Brazilian cities, it's recommended to avoid secluded areas especially at night and always be vigilant of your surroundings. While petty crime such as pickpocketing can occur, it's not a significant concern when compared to other travel destinations in Brazil. In general, the locals are friendly and welcoming to tourists. Nova Friburgo also offers relatively safe public transportation options.