How Long To Cook 15Lb Turkey | Roast It, Not Dry

A 15-pound turkey often takes 3 ¾–4 ¼ hours at 325°F, then a 20–30 minute rest before carving.

A 15-pound turkey hits a sweet spot: big enough to feed a crowd, still manageable in a home oven. The trick is timing it so the breast stays juicy while the thighs get fully cooked. That balance comes from two things: a steady oven temperature and a thermometer that tells you what’s happening inside the bird.

This article gives you a clear cook-time target, plus the small choices that swing the clock—stuffed vs. unstuffed, cold turkey vs. room-temp turkey, foil vs. no foil, convection vs. regular bake. You’ll also get a complete roast method, a simple seasoning plan, and a recipe card you can follow without second-guessing.

How Long To Cook 15Lb Turkey In The Oven

For a whole, thawed 15-pound turkey roasted at 325°F, plan on about 3 ¾ to 4 ¼ hours if it’s unstuffed. If it’s stuffed, plan closer to 4 to 4 ¼ hours. These ranges assume a standard oven and a turkey that starts cold from the fridge.

The safest way to finish is not by the clock. It’s by internal temperature. Turkey is done when the thickest part of the breast and the thickest part of the thigh reach 165°F, measured with a food thermometer. If you cook stuffing inside the bird, the center of the stuffing also needs to reach 165°F.

Why A 15-Pound Turkey Can Finish Earlier Or Later

Two 15-pound turkeys can roast on different schedules. Here’s what moves the finish line:

• Oven accuracy. Many ovens run 15–25°F off. That alone can shift time by 20–45 minutes.
• Stuffing. Stuffing slows heat moving through the cavity, so the turkey takes longer.
• Pan and rack setup. A shallow pan plus a rack lets hot air circulate, helping even cooking.
• Bird shape. A broad, flatter turkey can cook a bit faster than a tall, compact one.
• Convection. A fan oven can roast faster than a still-air oven, so start checking earlier.

How Long To Cook A 15 lb Turkey At 325°F With A Safety Buffer

If you want a schedule that keeps you calm, build in a buffer. Plan for 4 ¼ hours of roasting at 325°F for an unstuffed 15-pound turkey, then add a 30-minute rest. That puts you at about 4 ¾ hours from “in the oven” to “ready to carve.” If it finishes early, the rest time doubles as a built-in hold.

That rest is not a bonus. Resting lets juices settle so the first slices stay moist instead of turning into a puddle on the board. It also gives carryover heat a chance to finish the center without blasting the outer meat.

When To Start Checking Temperature

Start checking about 45 minutes before your earliest estimated finish time. For a 15-pound turkey at 325°F, that usually means checking at the 3-hour mark, then every 15–20 minutes after that. If you see the breast climbing faster than the thighs, you can shield the breast with foil to slow browning and buy the legs more time.

Prep Steps That Change Cook Time

Thawing And Fridge Temperature

A fully thawed turkey cooks more predictably. If the center is still icy, the outer meat can overcook while the middle catches up. Thaw in the fridge and give yourself enough days so the bird is evenly soft from breast to cavity.

Brining And Wet Skin

Brining boosts seasoning and juiciness, yet it can also keep the skin damp. Damp skin browns slower. If you want crisp skin, pat the turkey dry and let it sit uncovered in the fridge overnight so the surface dries out.

Foil, Tent, Or No Cover

Foil affects browning more than total cook time. A loose foil tent can keep the skin from getting too dark while the inside finishes. If you cover tightly for a long stretch, it can soften the skin and trap steam.

Roasting Method That Stays Juicy

This method uses a steady 325°F roast and a simple thermometer plan. It’s built for a 15-pound turkey, with seasoning that fits a kitchen-and-foods site like kitchprep.com: clean flavors, pantry-friendly, and easy to repeat.

Equipment

• Roasting pan (shallow if possible)
• Roasting rack (or a bed of thick onion slices)
• Instant-read thermometer or probe thermometer
• Foil
• Kitchen twine (optional)

Quick Thermometer Plan

Check three spots:

• Breast: thickest part, away from bone
• Thigh: deepest part where thigh meets body, away from bone
• Stuffing (if used): center of the stuffing

For the official safe-temperature target, use the government guidance on FSIS turkey safe cooking temperatures.

Roast Turkey Recipe Card

Roast 15-Pound Turkey (325°F Method)

Yield: 10–12 servings
Oven: 325°F (163°C)
Roast time: 3 ¾–4 ¼ hours unstuffed (plan 4 ¼ hours)
Rest time: 20–30 minutes
Done temp: 165°F in breast and thigh

Ingredients

• 1 thawed 15 lb turkey, giblets removed
• 2–3 tbsp kosher salt (adjust if pre-brined)
• 1–2 tbsp black pepper
• 2 tbsp paprika (sweet)
• 1 tbsp garlic powder
• 1 tbsp dried thyme (or poultry seasoning)
• 4 tbsp butter, softened (or olive oil)
• 1 onion, quartered
• 1 lemon, halved
• 4–6 garlic cloves, smashed
• 2 cups low-sodium broth (chicken or turkey), for the pan

Steps

1. Heat oven to 325°F. Set a rack in a roasting pan.
2. Pat the turkey dry, inside and out. Let it sit at room temp 30 minutes while the oven heats.
3. Mix salt, pepper, paprika, garlic powder, and thyme. Rub butter over the breast, thighs, and drumsticks. Sprinkle the seasoning mix all over.
4. Place onion, lemon, and garlic in the cavity. Put turkey breast-side up on the rack. Tuck wing tips under.
5. Pour broth into the pan. Roast uncovered for 2 ½ hours.
6. Begin temperature checks. If the skin is getting too dark, tent foil loosely over the breast.
7. Keep roasting until breast and thigh hit 165°F. Expect total roast time around 3 ¾–4 ¼ hours.
8. Rest 20–30 minutes before carving. Strain pan juices for gravy if you want.

Cook-time ranges by turkey size are also summarized in the government’s Turkey Roasting Time by Size chart, which uses a 325°F oven and the 165°F finish target.

Timing Cheat Sheet For A 15-Pound Bird

Use this as a planning tool. The thermometer still has the final say.

Roast Setup	Oven Setting	Time Range For 15 lb
Whole turkey, unstuffed, standard oven	325°F, rack in pan	3 ¾–4 ¼ hours
Whole turkey, stuffed	325°F, rack in pan	4–4 ¼ hours
Whole turkey, convection	325°F convection	Start checks at 3 hours
Breast browning fast	325°F + foil tent	Time often unchanged; browning slows
Turkey starts extra cold	325°F	Add 15–30 minutes
Turkey rests before roasting (30 min)	325°F	Can shave off 10–20 minutes
Spatchcocked turkey (flattened)	425°F (common approach)	Often 1 ¼–1 ½ hours
Breast-only roast (not whole bird)	325°F	Varies by size; check early

How To Keep The Breast From Drying Out

Salt Early

If you can, salt the turkey the day before. Dry salting gives the meat time to season deeper, and it helps the turkey hold onto juices during roasting. Pat the skin dry right before it goes in the oven.

Use Foil As A Speed Control

If the breast hits 150–155°F and the thighs are lagging, tent foil over the breast. The breast keeps cooking, yet it slows down compared to the legs, so the dark meat can catch up without scorching the skin.

Pull At The Right Moment

Once the breast and thigh both reach 165°F, pull the turkey. Leaving it in “just a bit longer” is a common reason for dry slices. Resting finishes the job.

Where To Place The Thermometer So The Reading Is Real

Thermometer placement matters more than brand. Bones conduct heat and can trick the reading upward. Aim for the thickest meat and keep the tip away from bone and the pan.

What You’re Checking	Where To Probe	Target
Breast doneness	Thickest part of breast, sideways probe, away from breastbone	165°F
Thigh doneness	Deepest part where thigh meets body, avoid bone	165°F
Stuffing doneness (if used)	Center of stuffing mass	165°F
Carryover check	Recheck breast after 10 minutes resting	Stays at or above 165°F
Uneven cooking check	Second spot on breast and opposite thigh	All spots hit 165°F

Common Turkey Timing Problems And Fixes

“It’s Been 4 Hours And It’s Still Not Done”

First, verify oven temperature with an oven thermometer if you have one. Next, check where you’re probing. If the probe is too close to bone, readings can bounce around. If the turkey is under 165°F in the breast or thigh, keep roasting at 325°F and check every 15–20 minutes.

“The Skin Is Dark But The Inside Is Behind”

Cover the turkey loosely with foil. Keep the foil off the skin as much as possible, like a tent. That reduces browning while the interior catches up.

“The Breast Hit Temp, The Thighs Are Still Low”

Shield the breast with foil and keep roasting. Thighs often need extra time because they sit closer to the cavity and thick joints. A rack helps heat circulate around that area.

Carving And Serving Without Losing Juices

Rest the turkey 20–30 minutes. During the rest, pour pan juices into a measuring cup, let fat rise, then skim for gravy or drizzle. Carve breast meat across the grain into slices. Pull the leg quarter away at the joint, then separate drumstick and thigh.

If you need to hold the turkey longer than 30 minutes, tent it with foil and keep it in a warm spot. Don’t wrap it tight. Tight wrapping traps steam and softens skin.

Leftovers: Cooling And Storage

Get the meat off the bones within a couple hours so it cools faster in the fridge. Slice or shred, then store in shallow containers. Add a splash of broth to keep it moist. Use leftovers in sandwiches, soup, pot pie, or fried rice.

For reheating, warm gently with a little liquid and cover loosely. High heat can dry turkey fast.