Can I cook prime rib at 300 degrees?
Ideally, the roast will be at room temperature before it enters the oven. If this is the case, the prime rib will need 8 to 15 minutes at 500 degrees Fahrenheit, then another 1 to 2.5 hours at 300 degrees Fahrenheit, depending on the size of the roast. How long do you cook prime rib …