Here’s the math that will save your Thanksgiving: 13 to 15 minutes per pound at 325°F if your turkey is unstuffed. For an 18-pound bird, that’s a total of 234 to 270 minutes—or, in human terms, about 4 to 4.5 hours. If you stuff it, add 15–20 minutes per pound, so you’re looking at a 5 to 6 hour marathon. That’s longer than the entire Lord of the Rings trilogy, and with just as much suspense.
But don’t just set a timer and take a nap. The government (yes, the USDA) says your turkey needs to hit 165°F in the thigh, not just the breast. The breast can be 150°F if you let the meat rest, but the thigh must be safe—it’s the guilt-ridden uncle of the bird, holding all the bacterial secrets. Use a meat thermometer, not your gut feeling. You wouldn’t trust your gut with a mortgage, so why here?
The Myth of the Angry Oven
I once saw a recipe that said “cook at 450°F for 15 minutes, then drop to 325°F.” That’s like yelling at your oven to wake up, then asking it to chill out—rookie move. For an 18-pound turkey, keep it steady at 325°F from start to finish. Sudden heat swings make the skin crisp but the inside weep like a bad romance novel. Slow and steady wins the race, unless you want your guests to think you’re waging a personal war on poultry.
Surprising fact: turkeys are mostly water. An 18-pound bird contains about 10 pounds of water. That’s like cooking a fish tank. Don’t try to dry it out by blasting heat; you’ll just create steam. Instead, pat the skin dry with paper towels before seasoning. Yes, it feels weird. Yes, it’s worth it.
This Chart Tells You Exactly How Long to Cook a Turkey
