You’d think a turkey is just a big chicken, right? Wrong. When you cram it with stuffing, you’re essentially creating a dense, cold core inside the bird. That stuffing acts like a heat sink, sucking up all the oven’s energy before the turkey’s inner thighs even get a whisper of warmth.
For a 12-pound stuffed turkey, you’re looking at roughly 4 to 4.5 hours in a 325°F oven. But here’s the irony: this is just a starting point. Your oven might be a liar, your stuffing might be packed too tight, or your bird might still be chilly from the fridge. Trust your thermometer, not the clock, okay?
The golden rule: 15 minutes per pound (but with a twist)
Conventional wisdom says 15 minutes for each pound of stuffed bird. For 12 pounds, that’s 180 minutes—exactly 3 hours. Spoiler alert: that’s almost never enough. The USDA says the stuffing itself must hit 165°F, and the thickest part of the breast needs 165°F too. That takes time.
I’ve found that 12-pounders usually need about 4 hours. Why? Because the cold stuffing can drop the internal temperature of the bird by 20 degrees when you first shove it in. Your oven has to fight through that thermal inertia. Pro tip: let your stuffed turkey sit at room temp for 30 minutes before roasting—just don’t leave it out longer, because food safety.
