Pork tenderloin should be cooked to an internal temperature of 145°F (63°C) . This is the safe internal temperature recommended by the USDA and the National Pork Board. Cooking pork to this temperature ensures that it is safe to eat and also results in a juicy and tender piece of meat. It is important to use a meat thermometer to check the internal temperature of the pork tenderloin. Once the pork tenderloin reaches the recommended temperature, it should be allowed to rest for 3-5 minutes before slicing. This allows the juices to redistribute throughout the meat, resulting in a more flavorful and tender pork tenderloin.