How Long to Cook Pork Tenderloin
Pork tenderloin is the leanest, most tender cut on the pig, and that is exactly why it is easy to overcook. A typical tenderloin weighs 0.75 to 1.5 lb, far smaller than a pork loin roast, so it cooks in a hurry. Roasting at 425F runs about 20 to 25 minutes for a 1.25 lb tenderloin; a hot grill or a sear-then-roast finish trims that to roughly 16 to 20 minutes. The single biggest variable is not the clock but the internal temperature.
Cook minutes = weight(lb) x minutes-per-lb x doneness factor (+5 min if you sear first)
The 145F Rule and Why It Changed
In 2011 the USDA lowered the safe minimum for whole pork cuts from 160F to 145F followed by a 3-minute rest. That 15-degree drop is the difference between gray, stringy meat and a blushing-pink, juicy slice. During the rest, carryover heat continues to climb 3 to 5 degrees and the juices redistribute, so pulling at 145F lands you right in the safe, succulent zone.
Roast, Sear-and-Roast, or Grill
A straight oven roast at 425F is the most forgiving and hands-off. Searing in a hot skillet first, then finishing at 400F, builds a deeper crust and shaves a few minutes off oven time but adds about 5 minutes of stovetop work. Grilling over medium-high direct heat is fastest at roughly 16 minutes per pound, but the lean meat scorches quickly, so turn it every few minutes and move it to a cooler zone once the exterior is marked. Whatever the method, a cold-from-the-fridge tenderloin adds nearly 20 percent to the cook time, so let it sit out 30 minutes first.
Frequently Asked Questions
What temperature should pork tenderloin be cooked to?
Pull it from the heat at 145F measured in the thickest part of the center, then let it rest for 3 minutes. That is the current USDA-safe target for whole pork cuts, and the short rest lets carryover heat finish the job while the juices settle for a tender, slightly pink slice.
How long does pork tenderloin take to cook?
A standard 1.25 lb tenderloin needs about 20 to 25 minutes roasting at 425F, or 16 to 20 minutes on a hot grill. Always confirm with a thermometer rather than the clock, since a thin tenderloin can race past 145F in just a couple of minutes near the end.
Should I sear pork tenderloin before roasting?
Searing is optional but rewarding. A 2 to 3 minute sear per side in a hot, oiled skillet builds a brown, flavorful crust, after which you finish it in a 400F oven. It adds about five minutes of active time but delivers noticeably better color and texture than oven-only roasting.
Is a little pink in pork tenderloin safe?
Yes. At 145F whole-muscle pork is safe to eat and will often look faintly pink in the center, which is normal and desirable. The pink color comes from the muscle pigment, not undercooking, so trust your thermometer over the color of the meat.
Practical Guide for Pork Tenderloin Cooking Time Calculator
Buy a digital instant-read or leave-in probe thermometer before you buy anything else. Pork tenderloin is so thin and lean that the window between perfectly juicy and disappointingly dry is only a few degrees and a couple of minutes. A probe set to alert at 143F lets you pull early and ride the carryover heat to a perfect 145F resting target.
Do not confuse tenderloin with loin. A pork loin is a wide, fatty roast that can weigh 2 to 4 lb and needs 20 minutes per pound at a lower oven temperature, while a tenderloin is a slender 0.75 to 1.5 lb muscle that cooks hot and fast. Using loin timing on a tenderloin will overcook it badly, which is why this calculator flags anything over 3 lb.
Treat the rest as part of the cook, not an afterthought. Tent the tenderloin loosely with foil for at least 3 minutes (5 is even better) so the juices that were driven to the center can redistribute throughout the meat. Slice too soon and that liquid runs out onto the cutting board instead of staying in each bite, leaving the slices dry no matter how carefully you watched the temperature.
Quick Checklist
- Let the tenderloin sit at room temperature 30 minutes before cooking, or add ~20% to the time.
- Pat dry, oil, and season well; pork tenderloin browns better on a dry surface.
- Probe the thickest center and pull at 143 to 145F, never by the clock alone.
- Rest loosely tented 3 to 5 minutes before slicing across the grain.