Nothing is better than a perfectly cooked prime rib roast. That buttery perfection that just melts in your mouth,  slices with the barest pressure of a knife, covered in a brown gravy, with a side of mashed potatoes and greens of some sort…culinary heaven.

How to Cook Prime Rib Roast
How to Cook Prime Rib Roast

How to Cook Prime Rib Roast from Start to Finish!

This fool proof method will guarantee you the juiciest, best prime rib roast you’ve ever had! Since I became emboldened by the fact that I own a meat thermometer, and prime rib roasts are affordable this time of year (not so many tears when I screw it up) I have roasted about 5 over the past year, and just did another one for Thanksgiving lunch this Saturday. Yes, a lunch. I worked all weekend evenings this long weekend, so my parents were kind enough to make a turkey feast for the kids and Mike, while I had hospital cafeteria food. So I think a prime rib lunch before one of my shifts was entirely deserved 😉

Ingredients Needed for Cooking Prime Rib

  • prime rib roast
  • butter

How to Cook Prime Rib

How to Cook a Prime Rib Roast – Instructions

  • Remove your roast from all its packaging and  let it sit out for an hour until it’s about room temperature. Never, ever, cook a roast from frozen. The outside will be overdone and the inside will be raw. Absolutely a mess.
  • Take the butter and cover not only the ends, but if you don’t have a layer of fat on the top, cover that as well. When choosing prime rib, you actually want a layer of fat on the top. This helps make the roast oh-so tender. This roast didn’t have a layer, it was butchered too close,  so I put a layer of butter on top.
  • Preheat your oven to 450 degrees at this point.
  • Once it’s covered, place on a wire rack in a pan deep enough to catch the drippings.
  • Now we want to sear the roast. Place it in the 450 degree oven for about 20 minutes.
  • It should be nicely browned (seared) on the outside now. This in theory seals in all the juices, and to be honest, when I do it this way I hardly have any drippings for gravy. So it really must do something to hold in the juices. Now you can turn the oven down to 325 degrees and roast.
  • You cannot cook prime rib without a meat thermometer. You can’t. This masterpiece depends on a precise temperature, with it being pulled out of the oven at the exact right moment. This can’t be achieved without a thermometer. And to be honest, if you spend $50 on a roast, why on earth wouldn’t you pick up a $15 digital thermometer?
  • I measure on the outside where on the thermometer it will hit and put my fingers there.
  • Then keeping my fingers on the same spot, I put the thermometer in the middle of the roast until it reaches to where I measured. Make sense? Probably not. I usually just pretend I know what I am talking about.
  • Now place in the 325 degree oven for baking. Below are guidelines for roasting a prime rib roast.  You want to pull the roast out a minimum of 10 degrees BEFORE you hit these temperatures. Once the roast is out, tent it with foil, and let it sit for about 20 minutes. The temperature will rise at least another 10 degrees if you cover it in foil. It also lets the juices set and flow back to the meat. Be sure that you always cook your food to their safe temperature.

Prime Rib Roasting Internal Temperatures

  • Blue in the middle– 110 degrees Fahrenheit  – when the middle of the roast still “quivers”
  • Rare- 120-125 degrees Fahrenheit in the middle
  • Medium-rare– 125- 135 degrees Fahrenheit in the middle
  • Medium – 135- 140 degrees Fahrenheit in the middle. You usually don’t want it cooked this much as you lose the tenderness that prime rib is known for.
  • Medium Well-140- 150 degrees Fahrenheit
  • Well-done– 155 + degrees Fahrenheit

So, you have pulled it out 10 degrees Fahrenheit before it’s ready and tented it in foil for 20 minutes, right? Now it’s time to remove the bones. You want to slice along the curve of the bones.

How long do you cook a prime rib roast per pound?

I would allow 15 minutes per pound for cooking time on your prime rib, but always give yourself some wiggle room when it comes to time and serving your holiday meal.

When cooking prime rib, it's important to know the right process. In this post, I'll show you step by step how to do it! #roastbeef #recipe #primerib #cooking

Now, this post on how to cook a prime rib roast sure brought out the well done lovers in the crowd. Listen : I’m just passing on what all the experts say is the best for this cut of beef. And yes, they are experts. Trained for years at culinary school, taught how to work with meat and how to cook it best.

You can definitely cook this until it’s well done, but don’t think that I’m going to take the fall for you possibly ruining a $100 roast! This method works incredibly well with prime rib roasts and it’s how I do it every year. However I can’t take responsibility for when you change a recipe!

Try my Leftover Prime Rib Hash Skillet with your leftovers, it’s amazing!  If you need another roast recipe there is also my How To Cook a Sirloin Roast.

IF YOU ARE LOOKING FOR A FLAVOURED PRIME RIB ROAST TRY MY HERB AND GARLIC PRIME RIB ROAST RECIPE!.That is a super flavourful roast and is shown in the video below! Happy cooking everyone, I hope your prime ribs turn out amazing!



How to cook prime rib roast - Find the process used to make the best roast for you and your family #roastbeef #recipe #primerib

4.88 from 16 votes
how to cook a prime rib roast
How to Cook Prime Rib Roast
Prep Time
10 mins
Cook Time
3 hrs 45 mins
Total Time
5 hrs 10 mins

How to cook prime rib roast from start to finish! This is a foolproof method that guarantees a great prime rib roast! 

Course: Main Course
Cuisine: American
Keyword: how to cook prime rib, prime rib roast
Servings: 15
Calories: 1352 kcal
Author: Karlynn Johnston
  • one prime rib roast of choice
  • butter if there isn't enough fat
  1. Remove your roast from all its packaging and  let it sit out for an hour until it's about room temperature.
  2. Take the butter and cover not only the ends, but if you don't have a layer of fat on the top, cover that as well. This roast didn't have a layer, it was butchered too close,  so I put a layer of butter on top.
  3. Preheat your oven to 450 degrees at this point.
  4. Once it's covered, place on a wire rack in a pan deep enough to catch the drippings.
  5. Now we want to sear the roast. Place it in the 450 degree oven for about 20 minutes.
  6. Turn down the oven to 325 degree and cook some more. Below are guidelines for roasting a prime rib roast .You want to pull the roast out a minimum of 10 degrees BEFORE you hit these temperatures.
  7. Once the roast is out, tent it with foil, and let it sit for about 20 minutes. The temperature will rise at least another 10 degrees if you cover it in foil. It also lets the juices set and flow back to the meat.
  8.  Now it's time to remove the bones. You want to slice along the curve of the bones and remove the meat. Slice it off, then slice as you would normally slice a roast.
  9. Serve and enjoy!
Prime Rib Roasting Internal Temperatures
  1. Blue in the middle- 110 degrees - when the middle of the roast still "quivers"

  2. Rare- 120-125 degrees in the middle
  3. Medium-rare- 125- 135 degrees in the middle
  4. Medium - 135- 140 degrees in the middle. You don't want it cooked this much.
  5. Medium Well-140- 150
  6. Well-done- 155 +

Recipe Video

Recipe Notes
  • Cook to the temperature you desire. See post for instructions.
  • The time on this is for a 15 lb prime rib roast, adjust your cooking time appropriately.
  • NUTRITIONAL VALUES WILL VARY ROAST TO ROAST, do not use these as accurate values. 
Nutrition Facts
How to Cook Prime Rib Roast
Amount Per Serving
Calories 1352 Calories from Fat 1080
% Daily Value*
Total Fat 120g 185%
Saturated Fat 50g 250%
Cholesterol 274mg 91%
Sodium 201mg 8%
Potassium 1002mg 29%
Protein 61g 122%
Calcium 3.4%
Iron 36%
* Percent Daily Values are based on a 2000 calorie diet.



Hey guys, I'm Karlynn! Welcome to The Kitchen Magpie, my website full of family friendly recipes, cocktails & homesteading tales of chickens & cows from the family farm! Make sure to check out my bestselling cookbook, Flapper Pie & a Blue Prairie Sky ,stay tuned for info on my second cookbook!


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  2. Great instructions for the oven method… I do mine Sous Vide now … because I love ALL Beef between rare and med rare…
    My mom would only eat meat Well Done.. and it always made me cringe…. I could just slice if off the cow, use my chefs torch, and I’d be happy…. :0)

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  8. Rose Staley Reply

    Stacy I am ordering a prime rib about 4 lbs, making it for the first time. It comes in a pre-seasoned bag. I too prefer my meat well done. Any tips on how long I should leave it in and at what temperature I should cook it? Thanks

  9. wellsmichelle31 Reply

    Stacy what is your cooking time please? I would like to cook one as well, but don’t like rare either. Thank you 🙂

  10. We made this for Christmas dinner, it was GREAT! Today is New Years Day and I am making Prime Rib again to celebrate my New Years Baby’s 21st birthday!

    I must say that your directions are the clearest, easiest to understand and follow, and fool proof! Thank you for making this website Karlynn.

    Teri in Montana, (Where summer is the best 20 minutes of the year.)

    • thekitchenmagpie Reply

      @Teri K Awesome!! That’s exactly how I intended this, clear and concise because there is nothing worse than ruining an expensive prime rib roast! Thanks for letting me know and a happy birthday to your 21 year old!  (and I laughed over your summer is the best 20 minutes of the year. I’m stealing that for when I talk about Edmonton now lol!)

  11. thekitchenmagpie Reply

    @Stacy w Merry Christmas to you as well, good job spreading the joy during this holiday season! ( sarcasm fully intended, in case you don’t understand it, which you seem to have a hard time doing.)

  12. lovetoeatandcook Reply

    Prime rib is such a special meat usually prepared at a special time or at a fine dining restaurant . . . With that being said let me also state that beef just taste better when it is not cooked to the consistency of shoe leather.  Don’t get me wrong I have plenty of family members that think that if a piece of beef isn’t cooked for the whole day (kidding, but not by much) it isn’t good to eat.  Oh, how many times has mother said that I was going to get sick eating raw meat.  I say to her when she gives me that horror stricken look that I’m no wild animal, what makes you think that I would eat ‘raw’ meat???!  She shakes her head in dissatisfaction at how I could have been reared in her home and come out so backward:-)  But, I have been married to a Certified Chef De’Cusine for over 26 years and there is no, No, NO Way he would EVER allow beef and Prime Rib at that to be cooked higher than med-rare OUR FAVORITE!!! Sorry Beef Destroyers I’m going to have to agree with the poster on her take on Prime Rib!  It’s my Bday and it’s What’s for Dinner!!!  

  13. Thanks shae517, looks like you are an expert. Your comment comes from some place high above. Look at you comment. just because you feel that does not make it the truth. Others like well done and infact notice a difference with a good cut. Maybe the problem is you dont know how to cook a roast well done and have it turn out juicy and nice!

    • @Aaronmc why on earth would I want to cook such a fine piece of meat well done, juicy or otherwise, when I can have it medium/medium rare, juicy and delicious?

      I am not an expert, but those who are, cook meat to this temperature. There is a reason why it is the standard temperature for serving great meat in restaurants and especially fine steakhouses, not well done.

    • AustinBigge Reply

      @Aaronmc he is right, well done is often specifically not guaranteed in good steak houses.  The taste and full flavor that comes from red meat is in the blood.  When you cook a roast till the blood is brown, the flavor and the texture is gone.  A prime rib roast can be made just as tender as a tenderloin, but not if you cook it well done.  Ask your meatcutter or butcher, they eat it rare, they work with meat every day, and they are the experts.

      BTW im a meat cutter and when people tell me they are going to cook it well done, i tell them my store will not be able to refund their meat.  I get people coming in every other week telling me our meat is the toughest meat they every got, and i follow up with the question “What rarity did you cook it?”

      The answer is always well done.  If you want well done go get some usda select chuck roast, any thing else is a waste of good money.

  14. going to try my first one this weekend. (they had a big sale this week)

    hope it turns out well, but i think i’ll be okay.

  15. Beef snobs really pizz me off. Listen, if I want my meat well done, then that’s how it will be. And if your recipe can’t make meat taste good the way I want it, then the problem is with the recipe.

    • thekitchenmagpie Reply

      @Christina It’s not about being a “beef snob” it’s about being smart enough to know which cuts of meat should and shouldn’t be cooked to well done. By all means, cook yours to well done, but DON’T blame the recipe if it’s horrible because well, I literally told you so ;) 

      • TerryMurphy2 Reply

        thekitchenmagpie To each his own but i cook beef well and it tastes better and juicier then anyone i know who cooks it rare its up to the individual and how they like it . My first job i was a butcher trainee from there i was a cook just a cook not a chef and still better then trained chefs who were friends . I cooked in Canada’s largest kitchen cooking for 500 people 2 x a day but i cooked it rare only because that’s the way most people like it i,m cooking for others not myself , i cook it at 500 not 450 for 30 min shut it off completely for 2 hrs or until thermometer is 10 degrees from proper time because the heat will rise as it sits . I just dont like blood my dad was opposite he tell the waiter to slap its ass and put it on his plate 😉

        • wellsmichelle31 Reply

          Terry what would you recommend temp and time for a medium WELL roast please?

    • Highlander2 Reply

      @Christina  Believe me when they say rare are and nothing more, if you go beyond you’ll mess it up, they haven’t tried my medium well or well done.  You can actually have a juicy well done stake, pork chops or yes Prime Rib.  And if you achieve this, you’ll realize how the hell did I miss this.  I’ll be attempting the impossible soon. A Prime rib on a fire pit.  Wish you were here to taste it, but Oh Well! it’s OK,  you like it rare anyway more power to you. The best Prime Rib I ever tasted was a well done Prime Rib, in the oven (it ruined the oven), reason why I’ll be attempting  the same on a fire pit.

      • Highlander2 I can’t imagine why anyone would spend good money on a steak or prime rib roast only to cook it well done.

        Sure, it might still have some juice in it, but jesus christ, might as well buy a poorer cut of meat if you’re going to obliterate it that way.

    • Amen Christina, If I spend the money to buy a Prime ribeye Roast, I want it WELL DONE!!! I cannot and WILL NOT eat any meat if it is the least bit pink!! That is cannabilistic!! EWWW!! Some want theirs half raw, well, I will put it in a dogs bowl and put it on the floor. They can it eat it there but not on my table in front of me and ruin my meal, looking at blood run -ning all over their plate~~~~EWWWWWW

  16. I enjoyed your recipe…..I think I love you…don’t tell my wife! 😉

    • thekitchenmagpie Reply

      @Meatlover Ha ha! Glad that you liked the recipe!! 😉

  17. I have tried A lot of recipes for prime rib, even science of cooking labs recipes. And This one is still my favorite …Prime rib should be kept simple. Follow the Basics. And definitely the Thermometer. And no heavy salting . Great recipe.

    • thekitchenmagpie Reply

      Wistiu  Thanks! Yes, no salt. You can flavor afterwards if you want, but a nice gravy does the trick! 

  18. Barbara Maring Reply

    Hi i wanted to share my way of preparing a  roast……i brush on mustard along with other spices & it came out amazing !   you should try it !!



  19. Thank you for the very detailed instructions. I am cooking a 9 lb. roast for my family this Easter. With your help I’m sure it will be great.

  20. ok, I have one in my freezer and will use this guide. After I buy a new thermometer, since mine met with an untimely demise in a sink.

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