Bothell is generally considered safe for solo female travelers. Like any location, it's advised to maintain general awareness of your surroundings, especially after dark. However, violent crime rates are relatively low. There's great respect towards women and as a traveler, you can expect hospitable and friendly locals. Public transportation and sidewalks are well-maintained and safe to use, even into the evening. Always use common sense and your trip should be enjoyable and trouble-free.