How Long to Cook a 5lb Beef Rib Roast: A Step-by-Step Guide

A beef rib roast also known as a prime rib or standing rib roast, is a gorgeous main course for holidays special events and impressive dinners. With its tenderness, marbling and full beefy flavor, it’s a cut of meat worth mastering.

But cooking the perfect beef rib roast requires more than just throwing a 5lb roast in the oven To achieve fork-tender, juicy meat encased in a flavorful, crispy brown crust, you need to know how long to cook a 5lb beef rib roast along with some key roasting techniques.

Follow this complete guide for nailing your next rib roast every time.

How Long Does it Take to Cook a 5lb Beef Rib Roast?

The basic timing guideline for roasting a rib roast in the oven is:

15-20 minutes per pound at 350°F

So for a 5lb beef rib roast, the total estimated cooking time is:

  • 75-100 minutes (1 hour 15 minutes – 1 hour 40 minutes)

This roasting time is appropriate for a medium-rare rib roast. If you prefer medium or beyond, extend the time up to 25 minutes per pound.

However, roasting times are just a guideline. The shape, exact size, bone-in vs boneless and your desired doneness all impact total cook time. Relying solely on a time per pound estimate can lead to under or overcooked roasts.

Use a Meat Thermometer for Perfect Doneness

The only way to nail the ideal doneness for rib roasts is to use a meat thermometer. Insert an instant-read or oven-safe meat thermometer into the thickest part of the roast and cook until it registers:

  • 120-125°F for rare
  • 130-135°F for medium-rare
  • 140-150°F for medium
  • 160°F+ for well done

This gives you perfectly cooked rib roast regardless of variances in shape or cook time. Check temperature early and monitor it as you near estimated cook time completion.

Add Extra Time for Bone-In Rib Roasts

Bone-in beef rib roasts take longer to cook than boneless since the bone partly shields the meat. Figure on adding 5-15 extra minutes per pound for a bone-in roast.

You can remove the bone for faster cooking. But leaving it in adds flavor and gives you the dramatic presentation of a standing rib roast.

Reduce Time for Smaller Rib Roasts

Larger roasts need more time since heat takes longer to penetrate all the way to the center. Smaller 3-4lb roasts may only need 12-15 minutes per pound at 350°F.

Reduce estimated time as the size decreases but still rely on a meat thermometer for determining perfect doneness.

Allow Carryover Cooking Time

Meat temperature continues rising even after the roast is removed from the oven. Allow the beef rib roast to rest at least 15-20 minutes before carving to complete this carryover cooking.

Factor in extra oven time for pulling the roast 5-10°F below your target temperature. It will coast up to the ideal doneness as it rests.

Add Time for Low Temperature Roasting

You can slow roast rib roasts at lower 250-275°F temperatures for ultra-tender results. But the extended cooking requires added time. Figure around 25-30 minutes per pound for low roasting.

Use a meat thermometer and allow generous resting time for roasts cooked at lower oven temperatures.

Tips for Roasting 5lb Beef Rib Roasts

Follow these tips along with the timing guidelines for flawless 5lb rib roasts:

  • Choose a roast with good marbling for flavor and tenderness.

  • Let roast sit out for 1 hour before cooking for more even heating.

  • Season well with salt, pepper and herbs like rosemary, thyme or sage.

  • Sear all sides in a hot skillet before roasting to boost flavor.

  • Roast fat side up on a rack in a shallow pan.

  • Baste periodically with pan drippings for moisture and flavor.

  • Allow at least 15 minutes resting time before carving.

With the proper roasting times and techniques, you’ll achieve the perfect medium-rare rib roast encased in a crispy, seasoned crust every time. For more rib roasting guides and recipes, check out

The Guide to Cooking A Perfect Standing Rib Roast


How long does it take to cook a 5 lb rib?

For a medium-rare 5 lb Prime Rib Roast, roast for 1½–2 hours until a meat thermometer inserted in the thickest part of the roast registers 125°F.

How many hours does it take to cook a 5 lb roast?

Approx weight
Rare (125 °F)
Medium (145 °F)
4 lb
1 hr 28 min
1 hr 53 min
5 lb
1 hr 32 min
2 hr
6 lb
1 hr 36 min
2 hr 4 min
7 lb
1 hr 40 min
2 hr 9 min

Is it better to cook prime rib at 325 or 350?

Cook Time and Temperature: Start by cooking your prime rib at 500°F for 15 minutes and then lower the oven temperature to 325° F and cook for 10-12 min per pound for rare, or 13-14 min per pound for medium rare, or 14-15 min per pound for medium well. A meat thermometer is essential to ensure you cook it perfectly!

What is the best temperature to cook a prime rib roast?

Brown the roast at 500°F (or as high as your oven will go) for 15 minutes. Lower the oven to 325°F to finish roasting: Reduce the oven temperature to 325°F. Roast in the oven until the thermometer registers 115°F for rare or 120° for medium rare, and 130°F for medium.

How long do you cook a 5 lb beef rib roast?

The cooking time for a 5 lb beef rib roast will depend on how rare or well-done you want your meat. To start, preheat your oven to 500°F and cook the roast for 15 minutes.

How long do you cook a bone in beef rib roast?

For a bone-in beef rib roast, a good rule of thumb is to cook it for approximately 15 minutes per pound at 500°F, then lower the temperature to 325°F and continue cooking for approximately 10-12 minutes per pound for rare, 13-14 minutes per pound for medium rare, or 14-15 minutes per pound for medium well.

How long to cook a 5 lb prime rib?

**The recommended cooking time for a 5 lb prime rib is approximately 15 minutes per pound at an oven temperature of 325°F (163°C). Therefore, the total cooking time for a 5 lb prime rib should be around 75 minutes, or 1 hour and 15 minutes.**

How do you cook a 5 lb rib roast bone in?

Heat a skillet with a high smoke point oil, such as vegetable or canola oil, and sear all sides of the roast for a few minutes before transferring it to the oven. What is the recommended oven temperature and cooking time for a 5 lb rib roast bone-in? Preheat your oven to 450°F (232°C).

Leave a Comment