A whole chicken should be baked in a preheated oven at 375 degrees Fahrenheit. The cooking time will vary depending on the size of the chicken and whether it is stuffed or not. A rough guideline for the cooking time of a chicken baked in the oven is 1 1/2 to 3 hours or so. Make sure the juices run clear when you pierce the chicken thigh.
The chicken temperature should be around 170 degrees. Be sure to not touch the bone when taking the temperature. Depending on the weight of the chicken it will take anywhere from 2 to 3 hours to cook a whole chicken in the oven.