WebPlace the prime rib, fatty side up, onto a roasting pan fitted with a roasting rack. Season liberally with sea salt and black pepper. Let it rest come to room …
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If you’re cooking your prime rib at a higher temperature, like 325°F, you’ll need to decrease the cooking time. For a 3-bone roast, you should cook it for approximately 2½ hours. For a 4-bone roast, cook time will be closer to 3½ hours. And for a 5-bone roast, you should plan on cooking for approximately 4½ hours.
For this Slow Roasted Prime Rib we cook the roast at 225 degrees F. If you have a convection oven, use 200 degrees F. How do I know when a prime rib is done? There is only ONE way to know that your roast has reached the right temperature, and that is with an instant read thermometer. Prime Rib is an expensive cut of meat.
Cook the boneless or bone-in prime rib at 500 degrees for 15 minutes and then reduce the oven temperature to 325 degrees and continue cooking until the meat is 5-10 degrees away from the desired doneness temperature (see cooking temperature guidelines above or below in the recipe card). 4. Allow time to rest.
The cooking chamber will heat up like an oven and roast the prime rib to perfection. If you’re cooking on a smoker, set the prime rib in the middle of the cooking chamber for best results. Smoking the rib roast will be easier to maintain a low 225 degrees throughout the cook due to the offset heat source.