Question: how long to cook a frozen pork tenderloin in oven?
Answer: Preheat the oven and place the frozen tenderloin in an oven-safe pan in the center of the oven. Roast covered or uncovered -- the tenderloin will cook faster covered. Covered, a 1 1/2-pound tenderloin will be ready in 75 minutes when cooked at 325 F, or 120 minutes if cooked uncovered.