Killer Barbecued Prime Rib Roast on the Kamado Grill

Updated on March 4, 2020
Paul Edmondson profile image

Paul is a barbecue enthusiast. He is currently grilling and smoking on a Komodo Kamado Ultimate 23.

Delicious Barbecued Rib Roast on the Grill

What's Rib Roast vs Prime Rib

Rib roast and prime rib are the same cut of beef, but the word prime refers to the quality of the beef. Prime is the highest rated beef. When I barbecue rib roast, I select a rib roast that has the bone on and I go with choice graded beef. Choice is less expensive, but still great quality. Around the holidays, Costco carries rib roasts and prime rib. Choice rib roast is about $10 a pound and prime rib roast is over $15 per pound.

Raw Rib Roast With Fat Cap

Preparing the Rib Roast for Grilling

Rib roasts are large pieces of meat. In this example, we have a rib roast that has three ribs and weighs about 8 pounds. We always grill meat at room temperature. This requires that the roast is set on the counter about two hours before grilling. Grilling a cold rib roast will cook the outer layer much faster than the inside, drying the meat out and leaving the cook ashamed of such a silly mistake.

Prime Rib Roast on the Kamado

2.9 stars from 27 ratings of Prime Rib Roast

Create a Fat Cap Flap

Rib roasts have a wonderful layer of fat that caps the roast. While the meat is on the grill, the fat will render and act as a basting agent. Take a large butchers knife and slice from the end of the ribs up the roast as close as possible to the meat creating a flap of fat still attached to the roast. This will allow us to add seasoning closer to the meat and have it marinated in while it cooks by the fat cap.

Slicing the Fat Cap Back

Using a Rub on the Rib Roast

There are tons of options for rubs on rib roasts. My favorite is a paste, but I'm often just as happy with a little olive oil and course salt.

Horseradish Prime Rib Roast Wet Rub Recipe

  • 1/4 cup horseradish
  • 1/4 cup pepper
  • 1/4 seasoned salt
  • 4 to 6 sprigs of rosemary
  • 2 sprigs thyme
  • 1/2 cup olive oil
  • 6 crushed cloves of garlic

Place all the ingredients in a bowl and mash them together to make a thick paste. Using your hands, coat the entire roast and the area under the fat cap flap. Let sit for 20 to 30 minutes while heating the grill. Heat the grill to 375 degrees. Grill in a roasting pan to catch the drippings for gravy.

Charcoal: I recommend Lazzard's mesquite charcoal on a Kamado, but this recipe will work well on gas grills as well.

Grilling technique: Set the grill up for indirect heat. I'll sometimes put a pizza stone down in addition to the roasting pan to deflect heat.

Rib Roast Rub

Placing the Rib Roast on the Kamado Grill

Setting the Temperature on the Grill

Rib roasts take about 20 minutes per pound to cook to medium rare at 350 to 375 degrees. Preheat the grill to 375 degrees and insert a meat thermometer that is readable externally from the grill. I use a meat thermometer that has about a 3 foot chord and a remote reader. Set the meat thermometer to 120 degrees.

The worst thing that can happen to a beautiful piece of meat is over cooking it. Pulling the meat from the grill at 120 degrees will deliver perfect medium rare rib roast. Since rib roasts are large, they hold heat and continue cooking once they are pulled from the grill. My rib roast rose 10 degrees in less than 15 minutes once it was pulled from the grill.

Total grilling time for an 8 pound rib roast: 2 1/2 hours

While the roast is resting, prepare to slice it in thin 1/4 slices of heaven.

How to Slice a Rib Roast

Step one, cut off the ribs with a large knife as close to the bones as possible. Then slice between each rib. The ribs are my favorite part of the roast.

To slice the roast, I recommend an electric knife. Roasts require quite a bit of slicing and using an electric knife makes it much easier. Going across the grain of the roast, slice 1/4 to 1/8 inch pieces. Try keeping the slices thin. This makes it easier to bite through in a left over sandwich!

How do you like your rib roast prepared

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Simple Rib Roast Rub Recipe

If you don't have time to make the horseradish version, this very simple recipe is among the most popular I know for large cuts of beef.

  • 1/4 cup garlic salt
  • 1/4 cup black pepper
  • Olive oil

Rub the roast in a three to five count of olive oil. Then add garilic salt and fresh cracked pepper liberally to the rib roast. We use a generous amount of seasoning because a rib roast is sliced with a thin edge that dissipates the salt and pepper.


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    • Alison Graham profile image

      Alison Graham 

      9 years ago from UK

      Thanks for the tip about the meat temperature rising once it is removed from the heat to 'rest' - I love the horseradish and sour cream mix too!

    • pmccray profile image


      9 years ago from Utah

      hummm . . . roast. I never thought of adding Pam to help the seasoning stick. Rated up, shared and bookmarked. Yummmmy

    • akirchner profile image

      Audrey Kirchner 

      9 years ago from Washington

      Looks delicious!

    • Healing Touch profile image

      Laura Arne 

      9 years ago from Minnetonka, MN

      This is a great hub. I just ate and feel the need to bbq a prime rib.


      Healing touch

    • raisingme profile image


      9 years ago from Fraser Valley, British Columbia

      Okay, you had me drooling at the title, now I'm a complete mess. What a terrific recipe!

    • agusfanani profile image


      9 years ago from Indonesia

      That's really mouthwatering ! thanks for the recipe .

    • David 470 profile image

      David 470 

      9 years ago from Pennsylvania, United States

      Great recipe and a well written hub thank you.

    • dallas93444 profile image

      Dallas W Thompson 

      9 years ago from Bakersfield, CA

      Living at Pismo Beach, about 30 miles from Santa Maria. I do enjoy their style of BBQ..! Enjoyed your hub!

    • Pamela99 profile image

      Pamela Oglesby 

      9 years ago from Sunny Florida

      Paul, My mouth is watering because that roast looks fantastic. Thanks for a great idea and recipe.

    • Hello, hello, profile image

      Hello, hello, 

      9 years ago from London, UK

      Thank you for your wonderful recipe. It was so well written that I could taste and smell it.

    • sheila b. profile image

      sheila b. 

      9 years ago

      I'm surprised it cooks so quickly. This is what I'll get for my son to cook for his wife's birthday. I think they'll like the sauce, too.

    • rt-cal profile image


      9 years ago from Australia

      Nothing is better then a good BBQed Rib. I will be trying it this week!

    • Paradise7 profile image


      9 years ago from Upstate New York

      Wow, this sounds so great! May I come to your house for dinner????

    • gredmondson profile image


      9 years ago from San Francisco, California

      Ah, man, that sounds so good. Is the end product any different from being bbqed on a Weber grill with oak wood chips?


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