How Long to Cook 1 lb Pork Tenderloin in the Oven

A 1 lb pork tenderloin takes about 18 minutes in a 400°F (205°C) oven after a quick stovetop sear, though thickness and oven differences can shift the timing. This simple mustard-and-herb version is sliced after a short rest; use a thermometer, not the clock alone, to cook it safely without drying it out.

Ingredients

1 pork tenderloin, about 1 lb (454 g), silver skin removed if present
1 teaspoon olive oil (5 ml)
½ teaspoon fine salt (about 2.5 g)
¼ teaspoon ground black pepper (about 0.5 g)
½ teaspoon garlic powder (about 1.5 g)
½ teaspoon paprika (about 1 g)
1 teaspoon Dijon mustard (5 g)
½ teaspoon dried thyme (about 0.5 g), or 1 teaspoon chopped fresh thyme (about 1 g)
1 teaspoon lemon juice (5 ml), optional, for serving

Instructions

Heat the oven and prepare the pork. Set a rack in the center of the oven and preheat it to 400°F (205°C). Pat the tenderloin dry with paper towels. If you see a shiny, tough strip of silver skin, slide a small sharp knife under it and trim it away while keeping the knife angled toward the strip so you do not remove much meat. Leave the tenderloin whole; cutting it into medallions before roasting would change the cooking time and make it easier to overcook.
Season it. In a small bowl, stir together the salt, pepper, garlic powder, paprika, and thyme. Rub the tenderloin with the Dijon, then coat it evenly with the seasoning mixture. The mustard is a thin binder rather than a thick sauce, so spread it over all sides. If the tenderloin has a very thin tail, tuck that end underneath and secure it with a toothpick if needed; this helps the thinner part cook more evenly.
Sear for color. Heat the olive oil in an oven-safe skillet over medium-high heat until it shimmers. Add the pork and brown it for about 1 minute on each broad side, then turn it briefly to brown the remaining sides, about 4 minutes total. Use tongs to turn it. The goal is a browned surface, not a cooked-through center. If you do not have an oven-safe skillet, sear the pork in a regular skillet and transfer it to a small baking dish.
Roast until it reaches the safe temperature. Put the skillet in the oven, or place the seared pork in the baking dish, and roast for about 18 minutes. Begin checking at 15 minutes because a narrow tenderloin may finish sooner, while a thicker one can take 20 minutes or a little longer. Insert an instant-read thermometer into the thickest part from the side, aiming for the center. USDA FSIS recommends that whole cuts of pork reach a safe minimum internal temperature of 145°F (63°C), followed by a 3-minute rest. If it has not reached 145°F (63°C), return it to the oven and check again after 2 minutes.
Rest, then slice. Transfer the pork to a clean cutting board and leave it undisturbed for at least 3 minutes. This required rest is part of the food-safety guidance and also gives the juices time to settle. Slice across the grain into rounds about ½ inch (1.3 cm) thick. If desired, spoon the juices from the skillet over the slices and finish with the lemon juice. Avoid touching the hot handle of the skillet, which may stay hot after it leaves the oven.

Tips

Use temperature as your finish line. The 18-minute oven estimate assumes a fairly typical 1 lb tenderloin, but shape matters: a short, thick piece takes longer than a long, narrow one. Put the thermometer in the thickest center, not against the pan or through to the board. Check in more than one spot if the reading seems unexpectedly high or low. A few minutes of variation is normal, so relying on a timer alone is the most common cause of dry pork.
Know which cut you have. Pork tenderloin is a narrow, lean muscle, usually around 1 lb. Pork loin is a much larger, wider roast and needs a different cooking time. If your package says pork loin, do not use this recipe’s 18-minute estimate; cook by internal temperature and expect a longer roast depending on its weight and shape.
Adjust the seasoning simply. If you do not have Dijon, use 1 teaspoon (5 g) yellow mustard; it tastes sharper and less wine-like but still helps the spices adhere. You can replace dried thyme with 1 teaspoon (about 1 g) chopped fresh rosemary or sage. Fresh herbs have a stronger, brighter flavor, so chop them finely and avoid using a large handful that could burn in the skillet.
Do not crowd the pan or slice too soon. A skillet large enough to hold the tenderloin without folding it lets the surface brown instead of steam. Rest the pork whole, then slice it just before serving. If you need to prepare ahead, keep it whole and refrigerate it promptly rather than leaving cooked meat at room temperature.

Serving Suggestions

Serve the sliced tenderloin with its pan juices and a starch that can catch them: mashed potatoes, roasted potatoes, rice, buttered noodles, or warm crusty bread. For a balanced plate, add a green vegetable such as roasted broccoli, green beans, or sautéed spinach. A crisp salad with a tart vinaigrette is also a good contrast to the savory, lightly smoky seasoning. If you have browned bits in the skillet, add a tablespoon or two of water or broth while the pan is still warm and scrape them up carefully; spoon this quick, savory liquid over the meat. Taste before adding extra salt, since the seasoning and pan juices are already salted.

Variations

Maple and mustard: Mix 1 teaspoon (5 ml) maple syrup into the Dijon before rubbing it on. It gives the crust a subtle sweetness and can brown more quickly, so watch the sear and do not leave the skillet unattended. Keep the thermometer target and resting time unchanged.

Lemon-herb: Replace the paprika with finely grated zest from about ½ lemon and use rosemary in place of thyme. Add lemon juice after roasting rather than before searing, which keeps the surface from getting wet and helps it brown. This version pairs especially well with potatoes and green vegetables.

Smoky spice: Use smoked paprika instead of regular paprika and add a small pinch of ground cumin, about ⅛ teaspoon (0.3 g). This creates a warmer, more pronounced spice profile without changing the oven method. For a little heat, add a pinch of cayenne, then taste the seasoning mixture before applying it.

Storage and Reheating

Refrigerate leftover pork within 2 hours of cooking, in a shallow airtight container. It keeps for 3 to 4 days in the refrigerator. For easier reheating, store slices with any pan juices so they do not dry out; alternatively, leave the tenderloin whole and slice only what you plan to serve. Freeze tightly wrapped portions for about 2 to 3 months for best quality, then thaw them in the refrigerator rather than on the counter.

To reheat, place slices in a covered oven-safe dish with a spoonful of broth or water and warm in a 300°F (150°C) oven until the center reaches 165°F (74°C), the USDA FSIS temperature for reheated leftovers. Thin slices may heat quickly, so check them early and avoid prolonged heating. You can also microwave a portion in a covered microwave-safe dish, turning or rearranging the slices midway, and check the temperature in the center. Reheat only the amount you expect to eat.

Frequently Asked Questions

How long does a 1 lb pork tenderloin take at 400°F?
After searing, plan on about 18 minutes in a 400°F (205°C) oven, with a likely range of roughly 15 to 20 minutes. A thick piece may need longer. Start checking at 15 minutes and use 145°F (63°C) at the thickest point, followed by a 3-minute rest, as your reliable guide.

Can I cook it without searing first?
Yes. Put the seasoned tenderloin directly into a baking dish and roast at 400°F (205°C), checking the center temperature rather than expecting the seared recipe’s exact timing. It may take a few minutes longer, and the outside will be less browned. You can also use the oven’s broiler briefly at the end for color, but watch it closely because the lean surface can darken fast.

Should pork tenderloin be pink in the middle?
It can be. Pork cooked to the USDA FSIS safe minimum of 145°F (63°C), then rested for at least 3 minutes, may look slightly pink in the center. Color alone does not tell you whether it has reached a safe temperature, so use a food thermometer. If you prefer pork more thoroughly cooked, you may cook it longer, but expect a firmer, drier result.

Do I need to cover the tenderloin while it roasts?
No. Leave it uncovered so the surface stays dry enough to brown. Covering it traps steam and softens the seared exterior. If the meat is browning more than you want, check its temperature and remove it when it reaches the target rather than covering it for the full roast.

Can I cook two 1 lb tenderloins at the same time?
Yes, if they fit in the pan with space between them so hot air can circulate. The oven time may be similar, but two pieces can differ in thickness and finish at different times. Check each tenderloin separately and remove each one when its thickest part reaches 145°F (63°C); give each a 3-minute rest before slicing.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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