how long to cook sirloin roast beef

Place roast in roasting pan or baking dish with a wire rack in bottom and cook for 40 minutes to 1 hour in the oven for medium rare to medium doneness. Remove roast when meat thermometer registers 135°F for medium rare; 150°F for medium.

I love a good roast beef. Top sirloin is one of the medium to higher priced roasts. There are definitely some cheaper roasts (eye of round and chuck roasts) and more expensive roasts (tenderloin and prime rib), but the top sirloin is a great middle of the road choice. It does not break the bank and it is still a nice and tender cut of beef.

But, like any roast, it is important to know how to cook it properly. An overcooked top sirloin roast is one majorly depressing meal. It can be tough and dry. But, it does not need to be that way and the top sirloin prepared and cooked properly is juicy, tender and delicious.

Top sirloin roasts come in various sizes and I find that I prefer the roast to be 5-6 pounds in size. The following recipe is based on 5-6 pound roast, but you could definitely use either larger or smaller cuts. But, be aware that the cooking times will vary if a different sized roast is prepared.

How to Cook Sirloin Roast so it is Tender:

The key to a tender sirloin roast is using a dry heat cooking method. Do not add any liquid to the pan. If you can, use a rack to get the roast off the bottom of the pan.

Preheat the oven to 450 degrees F. Make sure the oven reaches full temperature before placing the roast inside the oven. Once it hits 450 degrees F, place the pan in the oven and close the door. Depending on the size of your roast you want to allow it to cook at 450 degrees F for the first 20 minutes or so. Then, WITHOUT OPENING THE OVEN DOOR, reduce the oven temperature to 325 degrees F. Cook until internal temperature of meat reaches 140 degrees F. Depending on the size of your roast this may take between 2 to 3 hours or so. Its always best to use a meat thermometer but dont start checking too early. You want to leave the oven door shut as much as possible for this recipe.

Allow the meat to rest for after removing it from the oven. You can tent the meat with aluminum foil as it rests, if you like. Do not slice it until it has rested well and the juices redistribute. This will ensure a tender roast beef.

Use a very sharp carving knife when slicing the roast. Always slice against the grain to ensure tender meat. Thinner slices are better for serving but Im going to be honest, I like thicker slices myself. You do you, boo!

Storing Leftover Roast Beef:

Allow roast to cool completely. Store the leftovers in an airtight container for up to 3 or 4 days.

Yes, you can freeze leftover sirloin roast! Place in an airtight container and store in the freezer for up to 2 months. Alternately, you can wrap it in plastic wrap or use freezer bags. Personally, I like to wrap the slices in plastic wrap, then place them in an airtight container. That way it reduces freezer burn and you can remove a slice or two at a time, without having to thaw the entire batch.

How to Cook Sirloin Roast:

  • First of all, take the roast out of the fridge about 30 minutes before cooking so you arent cooking it cold.
  • Next, preheat the oven to 450 degrees F.
  • Ensure the roast is tied with twine.
  • Then, season the meat on all sides.
  • Place the roast with the fat side up on a roasting pan with a rack. You dont want the roast touching the bottom of the pan.
  • Next, place the roast in the preheated 450 degree F oven. Cook for about 20 minutes at that heat, then lower the heat to 325 degrees F, without opening the door.
  • Then, cook the roast until the meat thermometer inserted reaches about 140 degrees F. This should take approximately 2 ½ to 3 hours. This will vary depending on the size of your roast.
  • Remove the roast from the oven and allow it to rest for at least 15 minutes. You want to give it time for the juices to redistribute.
  • Once the meat has rested you can slice it.
  • Then arrange it on a platter.
  • Serve!

Place roast in roasting pan or baking dish with a wire rack in bottom and cook for 40 minutes to 1 hour in the oven for medium rare to medium doneness. Remove roast when meat thermometer registers 135°F for medium rare; 150°F for medium.


How long does it take to cook a roast beef at 350?

Type of roast
Oven temperature
Cooking time
Sirloin strip roast Whole
1½ – 1¾ hours
Sirloin strip roast Half (5-6 lbs)
1¼ hours
Top sirloin roast Whole
12-15 mins / lb
Top sirloin roast Half
17-20 mins / lb

How long does it take to cook a beef sirloin?

For the perfect medium-rare degree of doneness, your Top Sirloin steak grill time should be 9–12 minutes (on gas or charcoal) for a 1-inch steak. For a 1½ inch steak, cook for 12–15 minutes on either grill type. Turn your steak about 1 minute before the halfway point.

What temperature should a sirloin roast be?

The final temperature you want for your roast is going to entirely depend on what kind of meat you want. For a nice rare top sirloin roast, aim for the final temperature to be around 120 Fahrenheit. For a more tender medium-rare, shoot for about 130 Fahrenheit.

Should roast beef be 325 or 350?

When roasting meat and poultry, set the oven temperature to 325°F (163°C) or higher. Explore the charts below to learn how to get great results every time you cook.

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