Gruyères, Switzerland is generally recognized as very safe for solo female travels. It is a small and historically rich town with friendly local people. The low crime rates make it safe to roam around any time, though it's always good to follow basic safety measures regardless. European police are quite dependable, and locals are usually more than willing to help out in case of any trouble. The area is clean, well lit and the majority of people speak English, making it easier to navigate, even for tourists.