How do I know when a whole roasted chicken is fully cooked? Poultry is fully cooked and safe to eat when it reaches an internal temperature of 165°. A meat thermometer placed into the thickest part of the thigh close to the breast will give you the most accurate reading. Be sure you are not touching bone. Some people recommend checking for the color of the juices. Red juices mean the bird is still raw and clear juices signify a cooked chicken. However, I would caution you against using this method as different parts of a whole chicken cook at different speeds.