How Long to Cook a 16 lb Turkey in an Electric Roaster

3 to 3½ hours is the usual total cooking time for a thawed, unstuffed 16 lb turkey in an electric roaster. Treat that as a planning estimate, not a finish line: the turkey is ready when a thermometer confirms it has reached a safe temperature in the breast, thigh, and wing.

Use this quick plan to schedule the cook while keeping the lid closed and the meat moist.

Task	What to Plan
Thawed, unstuffed 16 lb turkey	About 3 to 3½ hours total
Initial browning phase	30 minutes at the roaster’s highest setting
Main cooking setting	325°F after browning
Roaster lid	Keep it on throughout cooking
Water in the roaster	None needed
Rest before carving	20 minutes under a loose foil tent
Safety check	Use a food thermometer in multiple spots

Why Electric Roaster Turkey Timing Is Different

An electric roaster cooks in a closed, humid environment. The lid holds heat and moisture around the turkey, so the bird can cook faster than it would in a conventional oven while producing plenty of drippings.

That efficiency is why time alone is unreliable. A roaster that runs hotter or cooler than its dial, stuffing in the cavity, and repeatedly lifting the lid can all change the finish time.

The clock helps you plan dinner, but the thermometer decides when the turkey is done.

Keep the lid on while the turkey cooks. Each time it is opened, heat and steam escape, extending the cook and reducing the roaster’s self-basting effect.

Do not add water to the bottom of the roaster. With the lid fitted properly, the turkey releases enough juices to baste itself. Adding water needlessly dilutes the drippings you may want for gravy.

How to Cook a 16 lb Turkey in an Electric Roaster

Cook the turkey breast-side up on a rack, beginning with high heat before finishing at 325°F until it reaches 165°F.

Step 1: Prepare the Turkey and Roaster

Start with a completely thawed turkey. Remove the packaging, neck, and giblet packet, then pat the turkey dry with paper towels.
Season the turkey as desired. Oil or butter on the skin can help the seasoning adhere and promote browning.
Set the roasting rack inside the removable insert and place the turkey breast-side up on the rack. The rack keeps the bird above the drippings.
Leave the bottom of the insert dry; do not add water.
For the safest and most predictable result, cook stuffing separately in a casserole dish rather than inside the turkey.

Insert a wired thermometer probe before putting the lid on. For the lid-closed electric-roaster method, set the thermometer for 180°F when the probe is in the thigh or 165°F when the probe is in the breast. Place a thigh probe deep in the meaty part without touching bone.

Step 2: Start With High Heat for Browning

Preheat the roaster with its lid on at its highest setting.
If your chosen roaster recipe uses a high-heat start, that setting is commonly 450°F, or 500°F if the appliance offers it.
Put the turkey in the preheated roaster, route the thermometer wire so the lid can close, and replace the lid securely.
Cook at the high setting for 30 minutes.

This initial burst of heat gives the skin a head start on browning. It will not produce the dry, deeply crisp skin of an uncovered oven roast, but it improves color without sacrificing the roaster’s moisture-retaining advantage.

Step 3: Lower the Heat and Cook With the Lid Closed

After the browning phase, reduce the roaster to 325°F. Confirm the exact setting in the electric-roaster recipe you are following, since roaster thermostats and methods vary. Butterball’s Whole Turkey roasting directions use 325°F for that maker’s product, though those directions are written for oven roasting rather than as a universal electric-roaster setting.

Keep the turkey covered and avoid lifting the lid to baste it. The turkey will cook in its own juices, and the wired thermometer lets you monitor progress without losing heat.

Begin checking the thermometer as the turkey approaches 3 hours rather than assuming it needs the full 3½ hours.

Step 4: Verify Doneness, Rest, and Carve

Check the thickest part of the breast, the innermost thigh, and the innermost wing. The turkey is safe when all of those areas reach 165°F; if the bird is stuffed, the center of the stuffing must also reach that temperature. USDA turkey safety guidance recommends checking all of these locations rather than relying on one reading.

Remove the turkey from the roaster once it passes the temperature check. Loosely tent it with foil and let it rest for 20 minutes before carving, following the rest time in your selected electric-roaster recipe.

I use aluminum foil as a loose tent rather than wrapping the bird tightly, because a tight wrap softens the skin.

Cooking a Stuffed or Partially Frozen Turkey

A stuffed turkey takes longer than an unstuffed turkey.

Stuffed Turkey Considerations

A stuffed turkey takes longer because the heat must cook both the bird and the stuffing. For the most reliable result, bake stuffing separately.

If you do stuff the turkey, fill it loosely just before cooking.

Some product directions call for a finishing temperature higher than 165°F. Product directions vary, so follow the directions for the exact turkey product you bought. Food Safety and Inspection Service guidance says the center of the stuffing must reach a safe minimum internal temperature of 165°F.

Partially Frozen Turkey Considerations

Do not use the normal roaster estimate for a partially frozen turkey.

Do not raise the roaster temperature simply to shorten the cook; it can overcook the outside before the interior is ready.

Pre-Brined and Self-Basting Turkeys

Read the package before salting a turkey labeled self-basting, enhanced, or pre-brined. These products often contain added salt solution, so adding a heavy salt rub can make the finished turkey and drippings overly salty.

You can still use herbs, pepper, garlic, citrus, onion, butter, or oil for flavor. The electric-roaster timing approach remains the same for these products.

How to Confirm the Turkey Is Safely Cooked

A thermometer placed in the right spots is more useful than the roaster dial, a pop-up timer, or the color of the juices.

Before serving, use this final check:

Insert the thermometer into the thickest part of the breast without touching bone.
Check the innermost thigh, where dark meat is slowest to finish.
Check the innermost wing joint.
If the bird is stuffed, test the center of the stuffing separately.
If one area is cooler than the others, return the turkey to the roaster, replace the lid, and continue cooking until every required location reaches a safe temperature.

Clear juices, loose legs, and browned skin can be useful visual clues, but none of them confirms that the thickest meat has cooked safely. A wired thermometer is especially helpful in an electric roaster because it lets you monitor progress during cooking.

Prevent Dry Meat and Pale Skin

Electric roasters excel at moist turkey, but the trade-off is softer skin. The covered environment traps steam, so the skin does not dry and crisp as fully as it does in an open oven.

To get the best balance:

Pat the skin dry before adding oil, butter, or seasoning.
Use the initial high-heat browning phase.
If very crisp skin is important, transfer the finished turkey to a broiler-safe pan and brown it under close supervision just before serving.

Save the concentrated roaster drippings for gravy. Because no water was added, the juices should have fuller turkey flavor; skim excess fat before using them.

Frequently Asked Questions

How long should I cook an 18 pound turkey in a roaster oven?

Cooking time in a covered electric roaster varies by the turkey’s size and your roaster, so use a thermometer to confirm it is done. Start checking early with a thermometer because stuffing, a cold starting bird, and opening the lid can extend the cook.

How long will a 20 lb turkey take at 325 degrees in an electric roaster?

A 20 lb turkey generally takes about 3½ to 4 hours in an electric roaster. Keep the lid closed and verify the breast, thigh, and wing with a thermometer before removing it.

Is it better to cook a turkey in a roaster or in the oven?

An electric roaster is better when you need oven space for side dishes or want a moist turkey with minimal basting. A conventional oven is usually better when deeply browned, crisp skin is the top priority.

Is it better to cook a turkey at 350 or 400?

Neither temperature is necessary as an all-cook setting for the high-start roaster method. Use the roaster’s highest setting for 30 minutes to begin browning, then cook at 325°F until the thermometer confirms the turkey is ready.

Do you put water in the roaster when cooking a turkey?

No, you do not need to pour water into the roaster for a turkey. Keep the lid properly fitted so the bird can baste in the juices it produces.