Although New Haven is an urban setting with its share of crime, students agree that they generally feel safe on campus and in town. Nearly all assaults happen off-campus or in less-frequented areas and take place late at night. Graduate students are most often the subjects of robbery or assault, most likely because they tend to live or work on the edges of campus.
Because New Haven is a city, it is easy to end up in a bad part of town simply by walking three blocks in the wrong direction. But you quickly learn what and where these places are and when to avoid them. Yale has its own police force, separate from the New Haven Police Department, and its presence is felt. There are also many services for student safety, such as police escorts to walk you home after late-night study sessions.
Although New Haven can be dangerous, it's normally safe unless you are unwise and walk home alone late at night. Most students agree that the safety services and security are a great resource and advise incoming students to make use of them. As long as you use common sense, there is rarely a reason to feel in danger.