How Long Should You Cook A 20 Pound Turkey?
A 20-pound turkey should be cooked in an oven at 325 degrees Fahrenheit for approximately 4 to 4.5 hours, or until the internal temperature of the turkey reaches 165 degrees Fahrenheit when measured with a meat thermometer. It is important to regularly check the temperature and baste the turkey with its own juices or melted butter to prevent it from drying out. Let the turkey rest for 20-30 minutes before carving for the best results.