Prime rib requires 15 minutes of cooking time per pound of meat, according to Today.com. Prime rib should enter the oven at room temperature and roast at 450 degrees Fahrenheit..
Although cooking prime rib for the correct amount of time is extremely important, it is also helpful to verify the temperature with a meat thermometer. Some models stay inside the meat as it cooks, while others must be inserted and immediately removed. Using a meat thermometer ensures that meat cooks thoroughly and is safe to eat. It also reduces the risk of over-cooking. The proper interior temperature for prime rib is 135 degrees Fahrenheit for a medium-rare roast and 150 degrees Fahrenheit for a medium roast, according to the Iowa Beef Industry Council.
Proper roasting of prime rib requires that the oven be pre-heated for at least 30 minutes, according to Today.com. This cut of meat does not need to sit on a roasting rack, as its bones elevate the meat above the bottom of the pan.
Prime rib benefits from a seasoning rub applied at least two hours before roasting. One popular seasoning combination is 1/4 cup salt and 1/4 cup ground black pepper. Another option is a mixture of 2 minced garlic gloves, 2 tablespoons ground black pepper, 2 tablespoons salt and 2 tablespoons Herbes de Province. Thyme, oregano and paprika also work well.