How Long To Cook Pork Loin?
QUICK ANSWER
Cook pork loin roast 20 minutes per pound at 375°F (190°C). 3-lb loin: 60-70 minutes; 4-lb: 80-90 minutes; 5-lb: 100-110 minutes. Sear first in hot pan (all sides, 6-8 min) then oven-roast. Internal temperature 145°F (63°C) per USDA. Rest 15 minutes. Different from pork tenderloin - pork loin is 3-5 lbs+, not to be confused.
Pork loin roast is the pork equivalent of a beef roast - a large, impressive cut perfect for Sunday dinners and holiday meals. Don't confuse with pork tenderloin (much smaller, 1-1.5 lbs; cooks in 25 min). Pork loin is 3-5+ lbs and takes 1-2 hours. The modern 145°F guidance means juicy roast rather than the dry, tough pork loin of past decades. Sear first for crust.
How long do you cook pork loin?
Timing depends on weight and temperature. At 375°F (190°C, standard): 20 minutes per pound; 3-lb pork loin 60-70 min; 4-lb 80-90 min; 5-lb 100-110 min; 6-lb 120-130 min. At 350°F (gentler): add 3-5 min per pound; produces slightly more tender results. At 400°F (crispier): subtract 3-5 min per pound; watch for over-browning. At 425°F (fast start technique): high heat first 15-20 min for browning, then reduce to 325°F to finish; total similar time. Bone-in pork loin roast: add 15-20% more time. Boneless pork loin: use standard times. Stuffed pork loin: add 10-15 minutes. The 145°F (63°C) internal temperature is USDA target. Pork loin is lean - overcooks quickly.
How do you cook pork loin properly?
Sear-then-oven method is best. Step 1: trim excess fat to 1/4 inch (leaves flavor without greasiness). Step 2: score the fat cap in a diamond pattern (helps rendering). Step 3: brine 4-24 hours (essential for moist roast; 1/4 cup salt + 1/4 cup sugar per quart water). Step 4: pat completely dry (essential for good sear). Step 5: season generously with salt, pepper, and any spices; herbs like rosemary, thyme, sage work well; garlic-crusted classic. Step 6: heat oven-safe skillet (or Dutch oven) over medium-high with oil. Step 7: sear roast all sides until deeply browned (6-8 min total). Step 8: transfer to preheated 375°F oven; roast to internal temp 140°F (about 60 min for 3-lb). Step 9: check thermometer; remove at 140°F (carryover brings to 145). Step 10: rest 15 minutes tented with foil - non-negotiable. Step 11: slice against the grain into 1/2-inch slices. Use pan drippings for gravy.
How do you know when pork loin is done?
Internal temperature is the gold standard. Use an instant-read thermometer in the thickest part avoiding bone; 145°F (63°C) is USDA food safety minimum with 3-min rest; can remove at 140°F as carryover cooking finishes to 145°F. Visual cues: exterior deeply golden-brown; slight pink blush in center is acceptable at 145°F; deep pink means undercooked; gray-white throughout means overcooked. Texture: roast should feel firm but yielding when pressed. Don't undercook below 140°F final. Don't overcook past 155°F - pork loin dries quickly; especially bad because roast size makes it obvious. Modern guidance changed in 2011 - the 160°F+ rule from older cookbooks is outdated. Trust the thermometer. The sweet spot: 140-145°F with juicy interior and browned crust. After roasting: rest 15 minutes tented with foil - crucial for large roasts; juices redistribute; cutting hot loses significant juices from large cuts.
Tips for the best pork loin roast?
Several techniques produce great pork loin. Trim fat to 1/4 inch: leaves flavor without greasiness. Score the fat cap: helps rendering and prevents curling. Brine 4-24 hours: essential for moist results. Sear before roasting: builds crust and flavor. Cook to 145°F (not higher): trust the thermometer. Rest 15 minutes: non-negotiable for large roasts. Use a herb-butter under the skin/fat: pushed under fat cap for extra flavor.
Cook pork loin 20 min per pound at 375°F. 3-lb roast 60-70 min; 4-lb 80-90 min; 5-lb 100-110 min. Sear all sides first (6-8 min) then oven-roast. Brine 4-24 hours for moist results. Internal temp 145°F per USDA - slight pink is acceptable. Modern guidance changed in 2011. Rest 15 min tented with foil (non-negotiable for large roasts). Don't confuse with pork tenderloin - completely different cut.
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