Changchun is generally considered safe for solo female travelers. Crime rates are low and the locals are usually friendly towards tourists. However, it's crucial to be cautious about common tourist scams, and to pay attention to personal belongings in crowded areas. Authorities and public services are efficient, and there's a reliable public transport system. Although English isn't widely spoken, language barriers are usually easy to overcome with translation apps. Being respectful to local customs and having common sense will greatly enhance the overall safety of your journey.