Reheating a pre-cooked ham seems like a straightforward task, but it is surprisingly easy to turn a succulent, salty centerpiece into a dry, leathery disappointment. Since most hams purchased at the grocery store are already fully cooked or hickory-smoked, your job isn’t really to “cook” the meat, but rather to warm it through to a safe and palatable temperature without leaching out the moisture.
Whether you are preparing a massive holiday feast or just trying to breathe life into Sunday leftovers, understanding the nuances of timing, temperature, and technique is essential. This guide covers everything you need to know about how long to reheat a cooked ham using various methods to ensure every slice is as juicy as the first.
Understanding Your Ham Type
Before you set a timer, you must identify what kind of ham you have. The “how long” depends entirely on the cut and the preparation style.
Fully Cooked vs. Partially Cooked
Most hams sold in modern supermarkets are labeled “fully cooked.” These can technically be eaten cold, but they taste significantly better when warmed. If your ham is labeled “cook before eating,” it is only partially cooked and requires a much longer time in the oven to reach a safe internal temperature of 160 degrees Fahrenheit. For the purposes of this guide, we are focusing on the standard, fully cooked variety.
Spiral Cut vs. Whole or Half Hams
Spiral-cut hams are pre-sliced all the way to the bone. While convenient for serving, they are much more susceptible to drying out because the heat can penetrate between the slices. Whole or half hams that are not sliced act as a solid thermal mass, taking longer to heat but retaining moisture more effectively.
The Gold Standard: Reheating in the Oven
The oven is the most reliable method for reheating a large ham. It provides even heat distribution and allows you to apply a glaze during the final stages of the process.
Setting the Right Temperature
To prevent the exterior from toughening before the center is warm, low and slow is the way to go. Set your oven to 325 degrees Fahrenheit. Anything higher than 350 degrees Fahrenheit risks scorching the sugar in the ham or evaporating the natural juices too quickly.
Calculating the Time
The general rule of thumb for a whole or half ham is 10 to 15 minutes per pound. For a spiral-cut ham, which heats faster due to the slices, aim for 10 to 12 minutes per pound.
If you have a 10-pound ham, you should expect the process to take roughly 1 hour and 40 minutes to 2 hours and 30 minutes. The goal is to reach an internal temperature of 140 degrees Fahrenheit. This is the sweet spot where the meat is hot but hasn’t begun to lose its structural integrity.
Moisture Control Techniques
To keep the meat moist, place the ham cut-side down in a roasting pan. Add about a half-cup of water, apple juice, or cider to the bottom of the pan. Most importantly, wrap the entire pan tightly with heavy-duty aluminum foil. This creates a steam chamber that prevents the dry oven air from wicking away moisture.
Using a Slow Cooker for Smaller Hams
If you have a smaller ham or a boneless quarter ham, the slow cooker is an excellent alternative that almost guarantees a moist result. It is also a great way to save oven space during a busy holiday.
Timing in the Crockpot
Because a slow cooker operates at lower temperatures, the timing is less about “per pound” and more about the setting. On the “Low” setting, a 4 to 6-pound ham will typically take 4 to 6 hours to reach 140 degrees Fahrenheit. On the “High” setting, it may take 2 to 3 hours.
Slow Cooker Tips
Since the ham will likely be sticking out of the top of a standard slow cooker, you may need to cover the top with a tent of aluminum foil before putting the lid on to ensure a tight seal. Adding a liquid base, such as pineapple juice or a brown sugar slurry, will enhance the flavor as it simmers.
Fast and Efficient: Reheating Ham Slices
If you are only reheating a few slices for a sandwich or a quick breakfast, the oven is overkill.
The Skillet Method
For the best texture, use a skillet over medium-low heat. Add a teaspoon of butter or a splash of water to the pan. Heat the slices for about 2 to 3 minutes per side. This gives the edges a slight sear while keeping the center tender.
The Microwave Method
The microwave is the fastest but riskiest method. To keep slices from turning rubbery, place them on a microwave-safe plate and cover them with a damp paper towel. Use 50% power and heat in 30-second intervals. Usually, 1 to 2 minutes total is enough for a standard serving.
Using an Air Fryer for Crispy Edges
The air fryer has become a popular tool for reheating because it’s fast. However, it can dry out ham very quickly if you aren’t careful.
Air Fryer Settings
Set the air fryer to 300 degrees Fahrenheit. If you have a thick slice or a small ham steak, wrap it in foil first. Heat for about 5 to 8 minutes. If you want those crispy, caramelized edges, open the foil for the last 2 minutes of the process.
Reheating a Frozen Cooked Ham
Ideally, you should thaw a frozen ham in the refrigerator for 24 to 48 hours before reheating. If you are in a rush and must reheat from frozen, you will need to increase your oven time by approximately 50%.
For example, a ham that would normally take 2 hours will likely take 3 to 3.5 hours from a frozen state. You must keep it tightly covered with foil the entire time to prevent the outside from burning while the inside remains an ice block.
The Importance of the Rest Period
Regardless of the method you choose, do not slice the ham immediately after taking it out of the heat. Let the ham rest, covered, for at least 15 to 20 minutes. This allows the juices to redistribute throughout the meat. If you cut it immediately, the moisture will pour out onto the cutting board, leaving you with dry meat.
How to Apply a Glaze Without Burning
If your ham comes with a glaze packet or if you are making your own, timing is everything. Most glazes have a high sugar content. If you apply the glaze at the beginning of the reheating process, it will burn and become bitter long before the ham is warm.
The best practice is to remove the ham from the oven about 20 to 30 minutes before it is finished. Crank the heat up to 400 degrees Fahrenheit, brush the glaze liberally over the surface, and return it to the oven uncovered. Keep a close eye on it; you want the glaze to bubble and caramelize, which usually only takes 10 to 15 minutes.
Safety Guidelines for Leftovers
When reheating ham that has already been served once and then refrigerated, the USDA recommends reheating it to an internal temperature of 165 degrees Fahrenheit instead of the standard 140 degrees Fahrenheit used for hams coming straight from the manufacturer. This ensures that any bacteria introduced during previous handling are destroyed.
Common Mistakes to Avoid
- Not using a meat thermometer: Relying solely on the clock is a gamble. Every oven and every ham is different. A digital meat thermometer is the only way to be 100% sure.
- Forgetting the liquid: Even a small amount of liquid in the pan creates the humidity necessary to keep the meat fibers supple.
- High heat: Resist the urge to speed things up by turning the oven to 400 degrees Fahrenheit. High heat tightens the proteins, squeezing out the moisture.
Frequently Asked Questions
How do I reheat a spiral ham without drying it out?
To keep a spiral ham moist, wrap it very tightly in heavy-duty aluminum foil to ensure no steam escapes. Add a small amount of liquid (water or juice) to the bottom of the roasting pan and reheat at a low temperature of 325 degrees Fahrenheit for about 10 minutes per pound.
Can I reheat a cooked ham twice?
While it is technically safe to reheat ham more than once if it reaches 165 degrees Fahrenheit each time, it is not recommended for quality. Each reheating cycle breaks down the proteins and removes moisture, making the meat increasingly dry and tough.
At what temperature is ham done reheating?
For a ham that was packaged in a federally inspected plant, you should reheat it to an internal temperature of 140 degrees Fahrenheit. If you are reheating leftover ham that has been handled and stored after its initial serving, you should reach 165 degrees Fahrenheit for safety.
How long does it take to reheat a 5lb ham?
In an oven set to 325 degrees Fahrenheit, a 5lb ham will take approximately 50 to 75 minutes. In a slow cooker on the low setting, it will take about 4 to 5 hours. Always check the internal temperature with a thermometer to be certain.
Is it better to reheat ham covered or uncovered?
It is almost always better to reheat ham covered. Using aluminum foil or a lid traps the moisture inside. The only time you should uncover a ham is during the last 15 minutes of cooking to set a glaze or crisp up the skin.