Turrialba is generally a safe place for solo female travelers because locals are usually very friendly and willing to lend a hand. It's a small city with a welcoming atmosphere that promotes a sense of security. The crime rate is low and is predominantly petty theft or pickpocketing which is a concern for any traveler, regardless of gender. However, as anywhere else in the world, it's always advisable not to display expensive belongings and to exercise general travel safety by avoiding isolated or poorly lit areas at night.