If your prime rib is colder than this, you may need to cook it longer. And if it’s warmer than this (say, room temp), it will cook much more quickly, so you should reduce the total cooking time.

You’ll need to cook prime rib for approximately 15 to 20 minutes per pound for rare to medium-rare, and 20 to 25 minutes per pound for medium to medium-well. If you set the oven to 325°F, add ...

LaFreida’s favorite cooking temperature for cooking prime rib is 325°, which he thinks creates the perfect medium sear. We’ve included cooking details for that temperature below as well.

If your prime rib is colder than this, you may need to cook it longer. And if it’s warmer than this (say, room temp), it will cook much more quickly, so you should reduce the total cooking time.

Related: Optimal Cooking Times for Different Prime Rib Weights Cooked at 325° Here are at-a-glance optimal cooking times for roasting at 325°, depending on the size of your roast. Again, this is ...