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How long to rest a 10 lb prime rib?

A 10 lb prime rib is a delicious cut of meat that deserves proper care and attention when cooking. Resting the prime rib after roasting is a crucial step to ensure that it turns out perfectly juicy and tender. But just how long should you let that big piece of meat rest before slicing and serving it? Here is a detailed look at how long you need to rest a 10 lb prime rib.

Why Resting is Important

Resting allows the juices in the meat to redistribute evenly throughout. As the prime rib roasts, the juices get pushed to the center. If you slice into it immediately, the juices will spill out quickly and the meat will end up dry. By letting it rest, the juices can absorb back into the meat fibers. This results in a juicier and more evenly cooked prime rib.

Resting also allows the proteins in the meat to relax. All the contraction of the muscle fibers that occurs during cooking needs time to loosen up. If you skip this step, the meat will be tougher. Letting the proteins relax results in a more tender prime rib.

Finally, resting gives you time to make sure the center of that thick cut of meat finishes cooking. The proteins will continue to cook and raise the internal temperature by 5-10 degrees F during the resting time. This ensures your prime rib does not end up undercooked in the very center.

How Long to Rest a 10 Pound Prime Rib

For a good size 10 lb prime rib, a resting time of 30-40 minutes is ideal. This gives enough time for the juices to redistribute, the proteins to relax, and the center to finish cooking. Here are some more details:

  • Rest it for at least 30 minutes. This is the absolute minimum rest time you want for a roast this large.
  • Aim for 35-40 minutes of resting time. This ensures the prime rib turns out as tender and juicy as can be.
  • Up to 45 minutes of resting won’t hurt. The longer rest gives the juices even more time to absorb.
  • Beyond 45 minutes is too long. The meat will start to cool too much and the crust may soften.

Keep in mind that you want the prime rib to rest undisturbed on a cutting board during this time. Tent it very loosely with foil to prevent it from cooling too quickly. You want it to stay as warm as possible while those important resting processes occur.

Resting Times Based on Roast Size

A 10 lb prime rib is a generously sized roast. Smaller and larger roasts need a little more or less resting time. Here are some general guidelines on how long to rest prime rib based on size:

Prime Rib Roast Size Recommended Resting Time
4 to 6 pounds 15 to 20 minutes
6 to 8 pounds 20 to 25 minutes
8 to 10 pounds 25 to 35 minutes
10 to 12 pounds 30 to 40 minutes
12 to 15 pounds 35 to 45 minutes

The thicker the roast, the longer it takes for the heat to evenly distribute during resting. Follow these time guidelines for perfectly rested prime rib of any size.

How to Tell If It’s Rested Enough

Checking the temperature is the best way to confirm your prime rib is properly rested. Use an instant read thermometer to take the temperature in the thickest part of the meat.

Your roast should rise about 5-10°F during resting time. So if you removed it from the oven when the center reached 130°F for medium-rare, look for it to reach 135-140°F after resting. Here are the target post-resting temperatures you want to see:

Doneness Post-Resting Internal Temp
Rare 130-135°F
Medium Rare 135-140°F
Medium 140-145°F
Medium Well 150-155°F
Well Done 160°F +

The temperature rise during resting means you can safely remove the prime rib from the oven a little underdone. The carryover cooking during rest will bring it to the final ideal temperature for perfect doneness.

Signs Your Prime Rib Has Rested Long Enough

Besides using a thermometer, you can look for a few visual cues that indicate your prime rib is rested and ready to carve:

  • The meat has firmed up slightly and is not as jiggly in the center
  • Juices appear more opaque versus transparent when you poke it
  • The outer crust looks dry vs moist right out of the oven
  • A meat thermometer probe slides in and out easily

If you see these signs and have allowed the recommended rest time, go ahead and start slicing into that beautiful prime rib roast!

Preparing the Prime Rib for Carving

Follow these simple steps when the resting time is up so you can serve gorgeous perfect slices of prime rib:

  1. Transfer the roast from the cutting board to a serving platter.
  2. Remove any strings or bones still attached.
  3. Take the temperature one more time to confirm doneness, especially in the thickest part.
  4. Carefully slice into 1/2 to 1 inch thick slices using a sharp carving knife.
  5. Arrange the slices neatly onto the platter and pour over any accumulated juices.
  6. Serve right away for incredibly tender, juicy prime rib!

Storing Leftover Prime Rib

A 10 lb prime rib will likely leave you with plenty of delicious leftovers. Store them properly so they retain moisture and flavor for prime rib sandwiches and quick meals later on.

  • Let leftover slices come fully to room temperature, then refrigerate.
  • Place leftovers in shallow containers or resealable bags.
  • Use leftovers within 3-4 days for best quality.
  • Reheat gently in the oven or microwave before serving again.

With proper resting, carving, and storage, your prime rib will be enjoyed to the very last slice!


Allowing an adequately sized 10 lb prime rib roast to rest before slicing into it is crucial for ensuring it turns out juicy, tender, and cooked to the right doneness. Follow the guidelines to rest it for 30-40 minutes under loose foil tenting. Use a meat thermometer to confirm it reaches the ideal post-resting temperature for your desired doneness. Letting it rest for the full recommended time guarantees delicious prime rib that is perfectly rested and ready to enjoy.