How Long Do You Cook Pork Loin In The Oven

ByLily

Pork loin roasted in the oven usually takes 20 minutes per pound at 350°F to reach safe internal temperatures. But exactly how long do you cook pork loin in the oven depends on the size of your roast, whether it’s boneless or bone-in, and the doneness you prefer.

This guide gives you simple time charts, step-by-step instructions, and a few easy tips so your pork comes out juicy every time.

How Long Do You Cook Pork Loin In The Oven

The short answer: plan on 20 minutes per pound at 350°F for a boneless pork loin. Bone-in roasts need closer to 22 to 25 minutes per pound because the bone slows heat transfer a bit.

Always cook to temperature, not just time. A digital meat thermometer is the only reliable way to know when pork is done.

Quick Time Chart At 350°F

  • 2 pounds boneless loin: 40 to 50 minutes
  • 3 pounds boneless loin: 60 to 70 minutes
  • 4 pounds boneless loin: 80 to 90 minutes
  • 5 pounds boneless loin: 100 to 110 minutes
  • Bone-in loin: add about 5 minutes per pound

These times are estimates. Your oven may run hot or cold, so check the internal temp about 10 minutes before the earliest time.

What Internal Temperature Should You Aim For

The USDA recommends a minimum internal temperature of 145°F for pork, followed by a 3 minute rest. That gives you a juicy, slightly pink center.

  • 145°F: juicy and slightly pink, best for most people
  • 150°F: light pink, still tender
  • 160°F: fully white, leaner and a bit drier

Pull the roast out of the oven when it hits 140°F to 145°F. The temperature will rise another 5 to 10 degrees while it rests.

Step By Step Roasting Instructions

  1. Take the pork loin out of the fridge 30 minutes before cooking. This helps it cook evenly.
  2. Preheat your oven to 350°F. Place the rack in the middle position.
  3. Pat the roast dry with paper towels. Dry meat browns better.
  4. Season all sides with salt, pepper, garlic powder, or your favorite rub.
  5. Set the loin fat side up in a roasting pan or on a rimmed baking sheet.
  6. Roast uncovered for 20 minutes per pound.
  7. Start checking the internal temperature 10 minutes before the estimated finish time.
  8. Remove from the oven at 140°F to 145°F.
  9. Cover loosely with foil and let it rest for 10 to 15 minutes.
  10. Slice against the grain into half-inch pieces.

Resting is not optional. It lets the juices settle back into the meat instead of running out onto the cutting board.

Boneless Vs Bone-In Pork Loin

Boneless loins cook faster and are easier to slice. They also dry out quicker, so watch them closely.

Bone-in loins have more flavor and stay moist a little longer. Add roughly 5 minutes per pound to your total time.

Should You Cover The Roast

Keep it uncovered for the whole cook if you want a browned crust. If the top starts getting too dark, tent it loosely with foil.

Some cooks sear the loin in a skillet first for extra color, then finish it in the oven. That works well but adds a few minutes to your total.

Common Mistakes To Avoid

  • Cooking by time alone instead of using a thermometer
  • Skipping the rest period and losing all the juice
  • Roasting at 400°F or higher, which dries out the outside
  • Cutting the loin with the grain, which makes it chewy
  • Not letting the meat sit at room temp before roasting

One more thing: if your loin is very lean, brush it with a little olive oil before roasting. It helps keep the surface from drying out.

Tips For A Juicy Pork Loin Every Time

  • Use a leave-in probe thermometer if you have one. Set the alarm to 140°F.
  • Brine the loin in salt water for 1 hour per pound for extra moisture.
  • Add root vegetables to the pan. They roast in the same time window.
  • Let leftovers cool, then store them in the fridge within 2 hours.
  • Reheat slices gently at 300°F so they don’t dry out.

If you follow the 20 minutes per pound rule and pull the roast at 145°F, you’ll get tender pork almost every time. Ovens vary, so treat the chart as a starting point and trust your thermometer.

Now you know how long to cook pork loin in the oven, how to season it, and how to rest it. Pick a size, set your timer, and check the temp early. That’s the whole game.

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