How Long to Cook a 9-Pound Turkey Breast

A fully thawed 9-pound turkey breast generally needs about 2½ to 3¼ hours in a 325°F (163°C) oven, but a thermometer—not the clock—determines when it is done. This simple roast uses butter, herbs, lemon, and broth for a browned skin and moist slices, and it can be served as a smaller alternative to roasting a whole turkey.

Ingredients

1 bone-in, skin-on turkey breast, about 9 lb (4.1 kg), fully thawed
1 tbsp kosher salt (15 g)
1 tsp freshly ground black pepper (2 g)
4 tbsp unsalted butter, softened (56 g)
1 tbsp olive oil (15 ml)
3 garlic cloves, finely grated or minced (about 9 g)
1 tbsp fresh thyme leaves, chopped (about 3 g), or 1 tsp dried thyme (1 g)
1 tbsp chopped fresh rosemary (about 3 g), or 1 tsp dried rosemary (1 g)
1 medium lemon, halved (about 150 g)
1 medium yellow onion, cut into wedges (about 150 g)
1 cup low-sodium chicken broth (240 ml), plus a little more if needed

Instructions

Heat the oven and prepare the pan. Set a rack in the middle of the oven and heat it to 325°F (163°C). Set a roasting rack inside a roasting pan. If you do not have a rack, make a bed of onion wedges in the pan and set the turkey on top; this lifts it slightly and helps keep the underside from sitting directly in the liquid. Pour the broth into the bottom of the pan, not over the turkey.
Prepare the turkey. Remove the packaging and take out any neck or packet of giblets from the cavity. Pat the turkey breast very dry with paper towels; drying the skin helps it brown. Do not rinse raw poultry, since splashing water can spread germs around the sink and counter. If the breast has a pop-up timer, treat it only as a rough indicator and use a separate instant-read thermometer for the final temperature.
Season the meat and skin. Mix the salt and pepper. Gently loosen the skin over the breast meat with your fingers, taking care not to tear it, and rub about half the salt mixture directly over the meat under the skin. Rub the remaining salt mixture over the outside. Stir the softened butter with the olive oil, garlic, thyme, and rosemary, then spread it under the skin and over the top. Tuck the lemon halves into the cavity if there is room, but do not pack the cavity tightly; airflow helps the breast cook evenly.
Roast the breast. Place it breast-side up on the rack. Roast uncovered for an estimated 2 hours 30 minutes to 3 hours 15 minutes; a 9-pound breast often takes close to 2 hours 45 minutes, but shape, starting temperature, and oven accuracy affect the timing. Begin checking at 2 hours 15 minutes. If the skin is already deeply browned before the center is done, lay a loose piece of foil over the top. If the pan becomes dry, carefully add another ½ cup broth (120 ml) to the pan, avoiding the skin.
Check the temperature carefully. Insert an instant-read thermometer into the thickest part of the breast, approaching from the side and keeping the probe away from bone. Check more than one spot because a large breast can cook unevenly. The USDA FSIS safe minimum internal temperature for poultry is 165°F (74°C); cook until the thickest areas reach at least that temperature. If one spot is below 165°F (74°C), return the turkey to the oven and check again after 10 to 15 minutes. Color and juices are not reliable substitutes for a thermometer.
Rest before carving. Transfer the cooked breast to a carving board and loosely tent it with foil. Let it rest for 25 minutes so the juices settle and the meat is easier to slice. Do not wrap it tightly, which can soften the browned skin. The resting time is included in the total time above, but the exact roasting time may vary.
Carve and serve. If the breast is bone-in, cut along one side of the breastbone and follow the bones to remove each lobe in large pieces. Slice each piece across the grain into slices about ¼ inch (6 mm) thick. Arrange the slices on a warm platter and spoon over a little pan juice if desired. Serve the rest of the pan juices separately after skimming off excess fat.

Tips

Thaw it completely first. A frozen 9-pound breast typically needs about two days to thaw in the refrigerator, though the exact time depends on its shape and your refrigerator. Keep it in a tray to catch drips, and do not leave it on the counter to thaw. This recipe’s prep and total times assume the turkey is already thawed.
Use a thermometer in the right place. The center of the thickest breast meat is the key reading. Avoid touching bone, which can give a misleading result, and check both sides of a large breast. If you have an oven-safe probe, set its tip in the thickest area and still confirm with an instant-read thermometer before serving.
Adjust the salt for the turkey. If the package says the breast is pre-brined, enhanced, or injected with a salt solution, reduce the added salt to about 1½ teaspoons (7.5 g) or omit it if the label indicates it is already heavily seasoned. The butter and herbs can stay the same. If using fine table salt instead of kosher salt, use about 2 teaspoons (10 g), since fine salt packs more densely in a spoon.
Keep the skin dry and avoid frequent basting. Butter under the skin seasons the meat, while a dry exterior helps the skin brown. Opening the oven repeatedly releases heat and can lengthen cooking, so check only when needed. If the skin needs more color once the meat is safely cooked, briefly use the broiler while watching closely; do not leave the turkey unattended.

Serving Suggestions

Serve the sliced turkey with mashed potatoes, roasted carrots, green beans, or a crisp salad. The mild herb-and-lemon seasoning also works with stuffing, cranberry sauce, dinner rolls, and a simple gravy. For gravy, pour the pan juices into a measuring cup, skim off excess fat, and use the flavorful liquid as part of your usual gravy recipe. Taste before adding salt, especially if the turkey was pre-brined or the broth was not low-sodium. A 9-pound bone-in breast usually provides about 10 servings, depending on the size of each portion and how many side dishes are on the table.

Variations

Use different herbs. Swap the thyme and rosemary for 1 tablespoon chopped sage (about 2 g) or use a mixed poultry-herb blend. Dried herbs are more concentrated, so use roughly one-third as much dried as fresh. The flavor will change, but the roasting method stays the same.
Add citrus or aromatics. Replace the lemon with an orange, or add a few onion wedges and a couple of celery pieces to the pan. These add fragrance to the drippings; they do not need to be served, and they should not be packed tightly inside the cavity.
Make it dairy-free. Replace the butter with 4 tablespoons (56 g) dairy-free baking butter or use 3 tablespoons olive oil (45 ml). Oil will not make the seasoning paste as creamy, but it still helps carry the herbs and encourages browning.
Use a boneless breast only with temperature checks. A boneless roast may cook faster and can be tied into a compact shape, so the timing for a bone-in 9-pound breast does not transfer exactly. Follow package guidance where available and begin checking early; the thickest center must still reach 165°F (74°C).

Storage and Reheating

Refrigerate leftover turkey within 2 hours of cooking. Remove the meat from the bones and store it in shallow, airtight containers so it chills promptly; keep the pan juices in a separate container. Cooked turkey keeps for 3 to 4 days in the refrigerator. For longer storage, freeze sliced or chopped portions in freezer-safe containers for about 2 to 3 months for best quality, and thaw them in the refrigerator rather than on the counter.

Reheat only the amount you plan to serve. Add a spoonful or two of broth or pan juice, cover the dish, and warm the turkey in a 325°F (163°C) oven until the pieces reach 165°F (74°C), checking with a food thermometer. Smaller portions can be reheated covered in the microwave; stir or rearrange the slices partway through and check several places for 165°F (74°C). Avoid repeated cooling and reheating, which can dry the meat and makes safe handling harder.

Frequently Asked Questions

How many hours does a 9-pound turkey breast take at 325°F?
A fully thawed, bone-in 9-pound breast commonly takes about 2½ to 3¼ hours at 325°F (163°C), with roughly 2 hours 45 minutes as a useful planning estimate. Oven performance and the breast’s thickness change the timing, so start checking early and remove it only once the thickest meat reaches 165°F (74°C).

Should I cook a turkey breast covered or uncovered?
Roast it uncovered so the skin can brown. If the surface gets darker than you want before the interior is done, cover it loosely with foil for the rest of the roasting. A tight foil cover traps steam and can leave the skin soft.

Is a 9-pound turkey breast enough for 10 people?
Usually, yes, particularly when it is served with several sides. Bone-in weight includes the bones, so a 9-pound breast does not provide 9 pounds of edible meat. Plan for larger portions or leftovers if turkey is the main attraction or your guests prefer generous servings.

Can I roast it from frozen?
This recipe is written for a fully thawed breast. Roasting poultry from frozen can take substantially longer and makes it harder to season evenly or estimate doneness; the outside may cook well before the center is ready. Thaw it in the refrigerator first, allowing around two days for a breast this size, then roast and check the temperature as directed.

Do I need to baste the turkey breast?
No. Basting is optional and does not reliably make the meat juicier; opening the oven often can slow cooking. The seasoned butter under the skin and the resting period help make flavorful slices. If you like the taste of pan juices, spoon them over the meat after carving instead.

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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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