Barbecue is all about the right temperature. Therefore, you can start to heal the grill fifteen to twenty-five minutes before it reaches a suitable temperature. This activity is a must to kill harmful bacteria. In addition, make sure that the grill is on 400-450 degrees Fahrenheit at a high temperature. In contrast, the medium is about 300-350 degrees Fahrenheit. Otherwise, the low heat is about 250-300 degrees Fahrenheit.