How Long to Cook a 20-Lb Spatchcock Turkey

At 450°F, FoodSafety.gov’s 12-pound spatchcock benchmark is about 70 minutes, but a 20-pound turkey has no guaranteed cooking time and should rest before carving. The turkey’s thickness, pan fit, and your oven’s performance can move the finish time earlier or later. Use the planning guide below to organize dinner, then let thermometer readings determine when the bird comes out.

Situation	Typical Range	Why
Fully thawed turkey, flattened in an uncrowded roasting pan	Use thermometer readings rather than a fixed roasting-time estimate	Flattening speeds cooking, but a large breast still takes time to heat through
Turkey still icy inside or squeezed into a pan	No dependable cooking-time estimate	An icy center or unevenly flattened bird makes timing unpredictable; correct this before roasting
Rest after oven roasting	20 minutes	Resting helps the meat retain its juices when sliced

Why a Large Spatchcock Turkey Has No Fixed Cook Time

Spatchcocking means removing the backbone and pressing the turkey flat. That exposes more of the bird to oven heat and reduces the difference between how quickly the breast and legs cook. It does not turn weight into a reliable minutes-per-pound formula.

A smaller-bird oven time and a large-bird smoker time are not interchangeable estimates for your turkey.

For context, the FoodSafety.gov spatchcock method uses 450°F (232°C) and about 70 minutes for a 12-pound turkey. That is a smaller-bird benchmark, not a direct schedule for a 20-pound bird. Confirm the turkey weight and cooking method when choosing a recipe.

Build your meal around a resting period and side dishes that can tolerate some flexibility.

How to Roast and Rest a 20-Pound Spatchcock Turkey

Roast the flattened turkey in a 450°F oven until the innermost thigh, innermost wing, and thickest breast each reach 165°F (74°C), then let it rest.

Step 1: Thaw the Turkey Completely

Plan refrigerator thawing before seasoning. N.C. Cooperative Extension gives a refrigerator-thawing range of 4 to 5 days for a 16- to 20-pound turkey. In its preparation guidance for turkey cooked on Traeger pellet grills, Traeger budgets 5 days for a 20-pound bird.
Keep the wrapped turkey on a tray or in a pan that will catch leaking juices. Never thaw it on the kitchen counter.
Before cutting out the backbone, check that the cavity is free of ice and the joints move freely. A thawed exterior does not prove that the center has thawed.

If you need the cold-water alternative, keep the turkey in airtight packaging or a leak-proof bag and submerge it in cold water. In Traeger’s preparation guidance for its pellet-grill turkey cooks, the allowance is about 45 minutes per pound, with the water drained and changed every 30 minutes.

Step 2: Check the Pan Fit and Spatchcock the Bird

Check that your rimmed roasting pan or baking sheet fits in the oven and can support the flattened turkey while containing its drippings. A large spatchcocked bird is much wider than an intact turkey.
Remove the neck and giblets. Place the turkey breast-side down on a stable cutting board, then use sturdy poultry shears to cut along both sides of the backbone.
Remove the backbone, turn the bird breast-side up, and press firmly over the breastbone until it lies flat.
Arrange the turkey skin-side up, preferably on an oven-safe rack in the pan. Spread the legs rather than folding them beneath the breast.

A butcher can remove the backbone if your shears cannot handle a bird this size. Do not force a knife through heavy bones or balance the turkey on an undersized board.

If the flattened bird will not fit without hanging over the pan or being folded back together, resolve that before cooking. Cooking separate turkey parts is a different method, with each piece checked individually for doneness.

Step 3: Season the Turkey and Preheat the Oven

Pat the skin dry with paper towels. Do not rinse raw turkey; splashing can spread contamination around the sink.
Season the turkey, taking account of any salt already added through brining or an injected solution.
Preheat the oven to 450°F. This is also the setting used in N.C. Cooperative Extension’s smaller-bird spatchcock method; its timed stages apply to that recipe’s stated weight, not automatically to your larger turkey.
Position the oven rack so the bird has clearance above it, then place the pan securely on the rack.

Wash your hands and clean and sanitize the board, shears, and surfaces that contacted raw poultry.

Step 4: Roast and Use Temperature Checkpoints

Roast the turkey skin-side up. Keep oven-door openings purposeful: checking browning, rotating the pan, or measuring temperature.
Rotate the pan if one side is browning noticeably faster.
If the breast skin becomes deeply browned before the meat is cooked, shield that area with foil while the turkey continues roasting. Shielding during cooking is different from wrapping the finished bird during its rest.

For comparison, N.C. Cooperative Extension’s method for a 10- to 12-pound spatchcock turkey uses an initial 30 minutes of roasting, a half-turn of the pan, and another 30 minutes. If the thigh-and-leg joint has not reached 165°F, that recipe calls for another 20 minutes before rechecking.

Monitor a larger bird closely as its internal temperature approaches 165°F.

Step 5: Check All Three Doneness Locations

Check for 165°F (74°C) in the innermost thigh, innermost wing, and thickest breast, following FoodSafety.gov’s spatchcock-turkey guidance.
Keep the thermometer tip in the meat, away from bone. Check both sides if the oven has browned them unevenly.
If any location is below the target, continue cooking and recheck. Do not remove the turkey because one thigh reading looks good while the breast or wing remains undercooked.

A leave-in probe can help you track progress, but it does not replace checks in the other locations. Do not rely on resting to finish a turkey that has not passed the temperature checks.

Step 6: Rest Before Carving

After oven roasting, let the turkey rest for 20 minutes before cutting, following N.C. Cooperative Extension’s guidance.
Leave the bird uncovered if crisp skin is the priority. Tight foil coverage traps steam and softens the skin.
Use the resting period to finish gravy and last-minute sides, then carve with clean utensils on a clean board.

For turkey cooked on a Traeger pellet grill, the maker recommends at least 30 minutes of rest for birds over 15 pounds and advises against tenting with foil. A 20-pound turkey falls within that category.

Resting is a quality step, not a substitute for cooking safely. Cutting immediately releases more liquid onto the board; waiting lets the meat cool slightly and retain more of that moisture when sliced.

Smoking a 20-Pound Spatchcock Turkey

Cooker temperature, airflow, weather, and the turkey’s preparation all affect the finish time.

For planning a Traeger pellet-grill cook, a bird over 18 pounds can take up to 6 hours under the maker’s general guidance. That is not a spatchcock-specific estimate. Match the selected recipe’s turkey preparation and grill temperature before treating it as a dinner schedule.

Start with a fully thawed, flattened, seasoned bird and make sure it fits the cooking surface without blocking the cooker’s intended airflow. For Traeger pellet grills, the common Smoke-setting stage is 1 to 3 hours, followed by cooking at 325°F or higher.

Traeger advises against cooking a large turkey entirely on the Smoke setting. That extends cooking substantially and can leave the skin rubbery rather than crisp.

Before removing the turkey, verify 165°F (74°C) in the innermost thigh, innermost wing, and thickest breast, avoiding bone. For a bird this size cooked on a Traeger pellet grill, rest it uncovered for at least 30 minutes, then carve and serve.

An oven schedule also should not be copied directly to a charcoal grill or trash can turkey rig. Those setups distribute heat differently and need a cooking method appropriate to the equipment.

Confirm the Turkey Is Ready to Serve

Before carving, make these final checks:

Temperature, not appearance, established doneness. Brown skin and clear juices are not substitutes for thermometer readings. Some safely cooked turkey can remain pink.
The meat, not bone or the pan, was measured. Reposition a probe if a reading seems inconsistent with neighboring areas.
Keep the bird intact rather than carving it and leaving the slices exposed.
The serving equipment is clean. Do not reuse an unwashed board, platter, or utensil that held raw poultry.

For wild turkey, pay particular attention to the actual shape and thickness of the bird rather than assuming it matches a farm-raised turkey of the same weight.

Once the temperature and resting checks are satisfied, carve the turkey and bring it to the table.

Frequently Asked Questions

Do You Put Water in the Bottom of the Pan When Roasting a Turkey?

No, water is not required for roasting a spatchcock turkey. A rack and a rimmed pan let heat circulate while collecting drippings. If you are saving those drippings for gravy, add water only as needed to keep them from scorching, without wetting the skin.

How Long Does a 20-Pound Spatchcock Turkey Take at 275°F?

There is no supported 20-pound spatchcock cooking-time estimate at 275°F in these methods. For oven roasting, use at least 325°F rather than a low-temperature oven schedule. Use a recipe appropriate to your cooker and turkey size rather than transferring an oven estimate to another cooking method.

How Long Can a Cooked Turkey Sit Out?

Refrigerate cooked turkey within 2 hours of leaving the heat. The resting period counts toward that time; the clock does not restart when you finish dinner. Carve leftovers into smaller portions and refrigerate them promptly in shallow containers rather than leaving the whole bird out to cool.