To keep a turkey moist when roasting, focus on not overcooking it by relying on a meat thermometer, using a brining method (dry or wet), and allowing it to rest fully after roasting.
The biggest challenge with roasting a turkey is preventing it from drying out, particularly the breast meat, which cooks faster than the dark meat of the thighs and legs. The most crucial factor in ensuring a moist turkey is to avoid overcooking it. Always use a reliable meat thermometer inserted into the thickest part of the thigh (without touching bone) to monitor doneness. The turkey is done when it reaches 165°F (74°C). Pull it from the oven as soon as it hits this temperature.
Additionally, implementing a brining method significantly contributes to moisture. A dry brine involves salting the turkey generously a day or two in advance and refrigerating it uncovered; this seasons the meat from within and helps the skin crisp. A wet brine involves submerging the turkey in a saltwater solution (often with herbs and spices) for several hours or overnight; this adds moisture to the meat, making it more forgiving if slightly overcooked.
Finally, resting the turkey after it comes out of the oven is non-negotiable. Tent it loosely with foil and let it rest for at least 20-40 minutes (or even longer for very large birds). This allows the juices to redistribute throughout the meat, resulting in a significantly more tender and juicy bird.
Consider spatchcocking your turkey (removing the backbone and flattening it) to help it cook more evenly and quickly, which naturally contributes to juicier meat and crispier skin.