How Many Hours To Cook a 15 Pound Turkey? | Roasting Time

An unstuffed 15-pound turkey roasted at 325°F typically takes 3 1/4 to 4 hours to reach a safe internal temperature of 165°F.

You’ve got the bird, the guests are on their way, and the oven is preheated. The one number you need is how long that 15-pound turkey will take. Guessing wrong means either a raw center or dried-out meat—neither works for a holiday centerpiece.

The honest answer involves more than just a single timer. Cooking time depends on whether the turkey is stuffed or unstuffed, whether it’s been brined, and whether you rely on a food thermometer rather than the clock alone. Here’s the breakdown so you can plan confidently.

Why Cooking Times Vary for a 15 Pound Turkey

Oven temperature, stuffing, and bird shape all affect the roast time. A standard oven set to 325°F is the baseline the USDA recommends. Straying lower than that risks unsafe internal temperatures, while higher heat can dry out the breast before the thighs finish.

Stuffing inside the cavity adds about 30 to 45 minutes to the total time because the stuffing itself must reach 165°F. Brined turkeys cook slightly faster than unbrined ones—the extra moisture conducts heat more efficiently—so frequent temperature checks are smart.

Weight Matters More Than You Think

A 12-pound unstuffed bird takes about 2 3/4 to 3 hours, while an 18- to 20-pound unstuffed turkey needs 4 to 4 1/4 hours. Your 15-pounder sits right in the middle of the chart, making the 3 1/4 to 4 hour window reliable for most home kitchens.

Why the Stuffed vs. Unstuffed Debate Matters

Many home cooks stuff the turkey because it’s traditional, but the USDA recommends against it for food safety reasons. Stuffing inside the cavity absorbs raw juices and takes longer to reach the safe 165°F mark, so the bird’s overall cooking time extends.

If you are cooking a stuffed 15-pound turkey, plan on 4 to 4 1/4 hours at 325°F. For optimum safety, consider cooking the stuffing separately in a casserole dish—it cooks faster, reaches temperature evenly, and eliminates the risk of undercooked dressing hiding inside the dark cavity.

• Unstuffed 15 lb turkey: 3 1/4 to 4 hours at 325°F.
• Stuffed 15 lb turkey: 4 to 4 1/4 hours at 325°F.
• Brined turkey: Check temp early; it often finishes on the shorter side of the range.
• Frozen turkey: Increases time by at least 50% over recommended thawed times.
• Resting time: Add 20 minutes after cooking before carving—this lets juices redistribute, not cook further.

The 13-minutes-per-pound rule is a common shortcut: 15 times 13 minutes equals 195 minutes, or about 3 1/4 hours. Other sources cite 10 to 12 minutes per pound. Both are rough estimates that work best as a starting point, not a final guarantee.

How to Check Doneness the Right Way

A cooking timer is useful, but a food thermometer is essential. The USDA says the turkey is safe only when the internal temperature reaches 165°F in three spots: the innermost part of the thigh, the wing, and the thickest part of the breast. The stuffing, if you cooked it inside the bird, must also hit 165°F.

For the most reliable reading, insert the thermometer into the thigh without touching the bone. Bone conducts heat differently and can give a false high reading. Trust the USDA’s USDA recommended oven temperature guidelines for the full safe handling details.

If you’ve brined the turkey, expect it to lose about 15 percent of its weight during cooking compared to up to 30 percent for an unbrined bird. The moisture retained by brining helps the meat stay tender and may shave a few minutes off the total cook time.

Four Practical Tips for a Perfect Roast

Getting the timing right takes more than a single number. These steps help the bird cook evenly and safely from start to finish.

1. Preheat the oven to 325°F exactly. Let it stabilize for 15 minutes before the turkey goes in. An oven thermometer clipped to the rack gives you a true reading—many built-in dials are off by 25°F or more.
2. Use a shallow roasting pan with a rack. The rack lifts the bird so hot air circulates around the whole surface, preventing the bottom from steaming in juices.
3. Tent loosely with foil if the skin browns too fast. If the breast skin is darkening well before the thigh hits 165°F, place a loose foil tent over the breast area for the last hour of roasting.
4. Rest for 20 minutes before carving. This step isn’t optional—it allows the juices to settle back into the meat fibers, so every slice stays moist rather than pooling on the cutting board.

For breast-only cooking, a whole turkey breast (4 to 8 pounds) takes 1 1/2 to 3 1/4 hours at 325°F. A half breast (2 to 3 pounds) finishes in 50 to 60 minutes.

Frozen Turkey and Brined Bird Adjustments

Cooking a frozen turkey saves time on thawing but adds significant oven time. The USDA says frozen turkeys take at least 50 percent longer than the recommended time for a thawed bird. For a 15-pound frozen unstuffed turkey, that means roughly 4 3/4 to 6 hours, and you must still verify 165°F at the three checkpoints.

If you brined the turkey, it cooks slightly faster than an unbrined one because the salt and sugar solution helps the meat conduct heat. Start checking the temperature about 30 minutes before the lower end of the recipe time window. The Illinois Extension turkey breast cooking time page offers a reliable baseline for both stuffed and unstuffed roasts.

The Bottom Line

For a 15-pound unstuffed turkey roasted at 325°F, plan on 3 1/4 to 4 hours—no more, no less—but always trust the food thermometer over the clock. Stuffing the bird adds about 30 to 45 minutes, and brining shaves a bit off the total. The safe internal temperature of 165°F in the thigh, wing, and breast is non-negotiable.

Your oven, your bird’s exact shape, and whether you preheated fully all shift the timeline slightly—set a timer for the minimum time, then check with a probe thermometer at each checkpoint to catch the exact moment of doneness without opening the oven door more than necessary.