Turrialba in Costa Rica is considered generally safe for solo female travelers. However, it's advisable to apply basic safety precautions, especially at night. While crime rates are not high, occasional instances of petty theft have been reported. Stay in well-lit areas, avoid unwarranted attention, keep your valuable belongings secure, and be alert of your surroundings. Walking alone at night is doable but not highly recommended, it's better to take official taxis or walk in groups where possible. As always, follow your intuition and if a situation makes you uncomfortable, it's better to remove yourself from it.