Hosting a holiday dinner or a family gathering often brings a certain level of stress, particularly when the centerpiece of the meal is a large, beautiful ham. The good news is that most hams you buy at the grocery store are already fully cooked or “city hams.” This means your job isn’t actually to cook the meat, but rather to retherm it without drying it out. Knowing exactly how long to heat a precooked ham is the difference between a succulent, juicy slice and a piece of salty leather.
Understanding Your Precooked Ham
Before you even turn on the oven, it is vital to understand what kind of ham you are working with. A “precooked” ham has usually been cured in a brine of salt, sugar, and spices, and then smoked or heated to a food-safe internal temperature at the processing plant.
Bone-In vs. Boneless
Bone-in hams are generally considered more flavorful because the bone conducts heat and adds depth to the meat’s taste. However, they take slightly longer to heat through. Boneless hams are easier to slice and heat more quickly because they are more uniform in shape.
Spiral-Cut vs. Whole
Spiral-cut hams are pre-sliced all the way to the bone. This makes serving a breeze, but it also makes the ham highly susceptible to drying out. Because the heat can penetrate between the slices, the moisture escapes faster. A whole (unsliced) precooked ham keeps its juices locked inside much more effectively.
Preparation Steps Before Heating
Preparation is just as important as the heating time itself. You want to ensure the ham comes up to temperature evenly.
Tempering the Meat
Take the ham out of the refrigerator about 1 to 2 hours before you plan to put it in the oven. Letting it sit at room temperature (tempering) takes the chill off the center. If you put a bridge-cold ham directly into a hot oven, the outside will overcook and become tough before the center even gets warm.
Choosing the Right Pan
Use a heavy roasting pan with high sides. If you are heating a spiral-cut ham, place it cut-side down in the pan. This helps trap the moisture among the slices. For a whole ham, place it fat-side up so that as the fat melts, it naturally bastes the meat.
How Long to Heat a Precooked Ham in the Oven
The oven is the most traditional and reliable method for reheating. The goal is low and slow. High heat is the enemy of a precooked ham.
Standard Oven Temperature and Timing
Most experts recommend setting your oven to 325 degrees Fahrenheit. At this temperature, you are looking at a general rule of 10 to 15 minutes per pound.
For a whole, bone-in ham weighing 10 pounds, you can expect a total heating time of 2 to 2.5 hours. For a boneless ham, which is often smaller (around 5 pounds), the time might be closer to 1 hour to 1 hour and 15 minutes.
The Importance of Moisture
To prevent the meat from drying out, add about a half-cup of water, apple juice, or white wine to the bottom of the roasting pan. Cover the entire pan tightly with heavy-duty aluminum foil. This creates a steam chamber that keeps the ham moist.
Specialized Heating Methods
While the oven is king, there are other ways to heat your ham depending on your kitchen setup and how much time you have.
Slow Cooker Method
If you have a smaller ham or a very large slow cooker, this is an excellent way to keep the meat moist. Place the ham in the crock with a bit of liquid (like pineapple juice) and cook on Low for 4 to 6 hours. This is ideal for boneless hams or smaller “sweetheart” hams. Because the environment is sealed, the ham stays incredibly tender.
Air Fryer Method
For a small ham steak or a very small 2 to 3 pound boneless ham, the air fryer is surprisingly effective. Wrap the ham tightly in foil and heat at 300 degrees Fahrenheit for about 10 minutes per pound. Check it frequently, as air fryers circulate heat much more aggressively than standard ovens.
Adding the Glaze
The glaze is the “crown” of the ham, providing that iconic sweet and salty crust. However, timing is everything.
When to Apply Glaze
Do not apply your glaze at the beginning of the heating process. Most glazes contain high amounts of sugar (honey, brown sugar, or maple syrup), which will burn if exposed to heat for two hours.
Instead, wait until the ham’s internal temperature reaches about 130 degrees Fahrenheit. Remove the ham from the oven, increase the oven temperature to 400 degrees Fahrenheit, brush on the glaze, and return the ham to the oven uncovered for the final 15 to 20 minutes. This allows the sugar to caramelize and bubble without scorching.
How to Tell When the Ham is Done
The only truly accurate way to know if your ham is ready is by using a meat thermometer. Relying solely on a timer is risky because oven calibrations and ham shapes vary.
Target Internal Temperatures
According to USDA guidelines, a precooked ham packaged in a USDA-inspected plant should be reheated to an internal temperature of 140 degrees Fahrenheit. If the ham was not packaged in such a plant (for example, if you bought it from a local butcher who smoked it themselves), it should be heated to 165 degrees Fahrenheit for safety.
Insert the thermometer into the thickest part of the meat, making sure not to touch the bone. Once you hit 135 degrees Fahrenheit, you can pull it out of the oven; residual heat (carryover cooking) will bring it up to the final 140 degrees Fahrenheit while it rests.
Resting the Ham
Once the ham has reached the desired temperature, resist the urge to slice it immediately. Resting is a crucial step. Transfer the ham to a carving board and tent it loosely with foil. Let it rest for 15 to 20 minutes. This allows the juices to redistribute throughout the meat. If you cut into it right away, the moisture will pour out onto the board, leaving you with dry meat.
Troubleshooting Common Issues
Even with the best intentions, things can go wrong. Here is how to handle common ham hiccups.
The Ham is Drying Out
If you notice the edges of your ham looking “curly” or “white,” it’s drying out. Immediately add more liquid to the pan and ensure your foil seal is airtight. If it’s already dry, serving it with a side of ham gravy or a mustard sauce can help salvage the meal.
The Glaze is Burning
If the glaze is browning too quickly during that final blast of heat, move the oven rack lower or place a loose piece of foil over the top of the ham.
The Center is Still Cold
If the outside is hot but the center is cold, your oven temperature might be too high. Drop the heat to 300 degrees Fahrenheit and give it more time. This is usually the result of failing to temper the ham before putting it in the oven.
FAQs
What is the best temperature to reheat a precooked ham?
The most effective temperature is 325 degrees Fahrenheit. This is warm enough to heat the meat efficiently but low enough to prevent the exterior from becoming tough or dry before the center is warmed through.
Do I need to cook a precooked ham?
Technically, no. Since it is already fully cooked, you can eat it cold right out of the package. However, most people prefer the texture and flavor of a ham that has been warmed and glazed.
How long do I heat a spiral-sliced ham per pound?
A spiral-sliced ham should be heated for approximately 10 to 12 minutes per pound. Because it is already sliced, it warms faster than a whole ham, so be careful not to overcook it.
Can I reheat a precooked ham the day before?
It is best to reheat it on the day you plan to serve it to maintain the best texture. If you must do it ahead of time, slice it while warm, store it in the refrigerator with its juices, and then very briefly warm the individual slices before serving.
How much ham should I buy per person?
For a bone-in ham, plan on about 3/4 to 1 pound per person. For a boneless ham, 1/2 pound per person is usually sufficient. This accounts for the weight of the bone and ensures you have a few leftovers for sandwiches the next day.