How long to cook a 6.5 lb prime rib roast

It can be confusing knowing how long to cook a rib roast as different cooking times (and temperatures) are recommended depending on the size of your roast. That's why having a standing rib roast cooking times table at your fingertips is a must when you can't afford to overcook your meat.

Rib Roast Cooking Times Chart

Use the chart below (find your roast size with corresponding times and temperature) as a guide to determine how long to cook your roast. The Iowa Beef Industry Council recommends roasting standing rib roast to medium-rare or medium, as do other experts.

Rare Roast

Medium-Rare Roast

Medium Roast

4-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour. Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 20 minutes. Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 40 minutes.

4 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 7 minutes. Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 30 minutes. Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 53 minutes.

5-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 15 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 40 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 5 minutes.

5 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 22 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 50 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 18 minutes.

6-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hour 30 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 30 minutes.

6 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hours 37 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 10 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 43 minutes.

7-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hours 45 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 20 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 55 minutes.

7 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 1 hours 52 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 30 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 3 hours 8 minutes.

8-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 2 hours 40 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 3 hours 20 minutes.

8 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 2 hours 7 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 2 hours 50 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 3 hours 33 minutes.

9-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 2 hours 15 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 3 hours.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 3 hours 45 minutes.

9 1/2-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 2 hours 22 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 3 hours 10 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 3 hours 58 minutes.

10-Pound Roast

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 2 hours 30 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 350 degrees F for 3 hours 20 minutes.

Roast at 450 degrees F for 15 minutes; then roast at 325 degrees F for 4 hours 10 minutes.

Checking for Doneness

To be sure your rib roast is fully cooked, check the internal temperature of your meat. For rare doneness, your meat thermometer should read 125 degrees Fahrenheit. For a medium-rare roast, make sure the internal temperature is at least 135 degrees Fahrenheit; when cooking roasts to medium doneness, your meat thermometer should read at least 145 degrees Fahrenheit. Don't forget to allow your roast to rest before you slice and serve it.

How long do you cook a 6.5 lb roast?

Regardless of the size of your roast, aim for cooking at 375 degrees F (190 degrees C), for 20 minutes per pound.

How long does it take to cook a 6 pound prime rib at 350 degrees?

For cooking instructions for prime rib roast that is boneless the basic cooking time is for medium is a 3 to 4 pound prime rib roast should be cooked at 350 degrees Fahrenheit for 23 to 30 minutes per pound, for a 4 to 6 pound prime rib roast you should cook it at 350 degrees Fahrenheit for 18 to 20 minutes per pound ...