How To Cook A Frozen Prime Rib Roast


If you’re searching how to cook a frozen prime rib roast, you might be wondering if it’s possible to do so without thawing the meat. While there are many ways to cook this cut of meat, all of them require some time in the oven.

Depending on how long your roast is frozen (and whether you’ve chosen a fresh or frozen), you’ll need to either thaw it before cooking or cook it at room temperature for 15 minutes per pound before putting it in the oven.

Doing neither of these things will result in an undercooked piece of meat that tastes like shoe leather and dries out quickly once cooked through!

Preheat Oven To 500 Degrees

Preheat oven to 500 degrees.

Place roast in roasting pan and allow it to sit at room temperature for 15 minutes per pound (for example, if your roast weighs 10 pounds, it should sit at room temperature for 150 minutes).

Cook the roast for about 15 minutes per pound for medium rare; cook until desired doneness is achieved or until internal temperature reaches 140°F to 145°F.

Remove From Freezer

First things first: remove the roast from its plastic wrap and place it, still frozen, in the refrigerator for 1-2 hours. Then set your oven to 500 degrees.

Now that we have all of that out of the way, let’s go ahead and allow our roast to come to room temperature for 15 minutes per pound by removing it from its fridge and placing it on a baking sheet (if you don’t have a baking sheet, use a cookie sheet—they’re basically the same thing).

Place Roast In Roasting Pan

The most important piece of equipment you’ll need is a good roasting pan. You want something that’s at least 2″ deep, and large enough to fit your roast without much extra space around it. I recommend using one that’s 13″ x 16″, or 16″ x 20″. If you have more room in the kitchen, go for it!

If you’re going through the trouble of buying an entire prime rib roast (or even just a couple pounds), chances are you’re trying to feed people who really care about what they eat. Prime rib isn’t cheap—you’re paying for quality meat. So don’t skimp out on the equipment!

Allow Roast To Sit At Room Temperature For 15 Minutes Per Pound

If you’re cooking a frozen prime rib roast, it’s important to allow it to sit at room temperature for 15 minutes per pound of meat before cooking. (That means a 4-pound roast should sit out for 60 minutes.) The reason why is that when the fat in a frozen piece of meat starts melting, it gets hot and expands—which can cause the meat on top to become dry and tough.

If you don’t give your beef enough time to come up in temperature so that all its elements are evenly dispersed, you’re going to run into trouble—and possibly end up with an undercooked dinner!

Also keep in mind: Don’t leave your prime rib out too long; otherwise, it’ll start cooking on its own! And don’t leave it out too short; otherwise, it might be undercooked when you cook it later (and nobody wants undercooked beef).

Cook For About 15 Minutes Per Pound For Medium Rare, Or Until Desired Doneness Is Achieved

You can cook a frozen prime rib roast for about 15 minutes per pound for medium rare, or until desired doneness is achieved. Cooking time will depend on the size of the roast and also on its temperature when you put it in the oven. If you have a big one, be prepared to spend most of your day cooking it!

A Perfectly Cooked Prime Rib Is A Thing Of Beauty.

A perfectly cooked prime rib is a thing of beauty. There’s nothing quite like the sight of a gorgeous, medium-rare roast with that rosy pink center and crusty exterior—and the smell! The aroma will make your mouth water in anticipation.

It can be difficult to determine how long it’ll take to cook your prime rib, but there are some general guidelines that should help you find what works for your oven and preferences:

  • Allow 15 minutes per pound for medium rare (130 degrees F internal temperature), 20 minutes per pound for medium (135 degrees F internal temperature), 25 minutes per pound for well done (140 degrees F).
  • For example, if you want to cook a 7-pound roast that’s 1/3 inch thick (about 1 inch thick), it should take around 5 hours of cooking time. However, this number may vary depending on the thickness of your roast and whether or not it has been frozen previously.
  • When shopping at the butcher counter or supermarket, look for roasts between 4 inches and 8 inches thick; anything thinner than this won’t have enough tenderness throughout its interior meat fibers—you’ll end up with something more like flank steak than filet mignon!

Can A Prime Rib Roast Be Cooked Frozen?

You can cook a frozen prime rib roast—and yes, it’ll still be delicious. Whether you’re cooking at home or in the office (we all know a coworker who brings in food from home), you might find yourself with a thawed out beast of beef on your hands. Here’s what to do:

  • Preheat your oven to 325°F.
  • Season the roast generously with salt and pepper. If using fresh herbs like rosemary or thyme, add them now as well.
  • Place the meat fat side up in an oven-safe pan that has been rubbed with canola oil or nonstick spray (a broiler pan works great for this). The meat should be sitting at least 1 inch from the rim of the pan so that juices don’t run off during cooking; if necessary, use heavy duty aluminum foil to lift it up off of any hot surfaces around it such as burners on your stovetop or heated racks inside your ovens.
  • Roast until internal temperature reaches 135°F for medium rare and 150°F for medium well (an instant read thermometer will help keep track here). If using an instant read thermometer inserted into thickest part without touching bone should read 135°F when done.)

How Long Does It Take To Cook A Frozen Prime Rib?

You can cook a frozen prime rib roast in 3 hours, 6 hours, or 9 hours. The best way to do this is to set your oven to 350 degrees and allow it to thaw for 15 minutes, before placing it on a rack inside of a roasting pan with some water in the bottom. Roast for 15 minutes per pound at 350 degrees F until the internal temperature reaches 125-130 degrees F (for medium rare). Remove from oven and let rest for at least 15 more minutes before carving. If you want more exact times, use this handy calculator!

How Long Does A Frozen Roast Take To Cook In The Oven?

When you’re cooking a frozen roast, the old saying “An hour per pound” holds true. But there are many factors that determine how long it will take to cook your roast:

  • The size of the roast will affect the cooking time. A large one may need more time than a small one.
  • The temperature of the oven has an impact on how long it takes to cook your prime rib roast too. You can make use of this knowledge by preheating your oven until it reaches its highest temperature setting before putting in your frozen prime rib—this way, it won’t take as long for it to get hot enough (and thus, cook).
  • Finally, remember that there is no “perfect” temperature at which every person likes their meat cooked; we all have different tastes! If you’re unsure about whether or not yours is done yet…keep checking!

Can You Cook A Frozen Roast Without Thawing?

No. Absolutely not.

Thawing your roast in the refrigerator takes a long time, especially considering you’ll have to cook it anyway. If you try, your meat will cook unevenly and might even get raw in some spots. Not good!


The point is, cooking a frozen prime rib roast can be an adventure. But if you follow these steps and keep an eye out for overcooking, you’ll end up with one of the most delicious meals of your life!

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