Hosting a holiday dinner or a large family gathering often feels like a high-stakes game of Tetris. You have a turkey or a roast in the oven, side dishes competing for stovetop space, and rolls that need to be toasted at the very last second. In the middle of this culinary chaos, the humble ham remains a centerpiece favorite. However, the biggest challenge isn’t cooking the ham—since most hams purchased at the grocery store are already fully cooked—it is reheating it without turning it into a salty piece of leather.
The secret weapon in your kitchen for this task is the slow cooker. Learning how to warm ham in slow cooker units allows you to free up precious oven space while ensuring the meat stays incredibly moist, tender, and infused with flavor. This method uses low, steady heat and a sealed environment to create a self-basting chamber that yields much better results than a dry oven ever could.
Why the Slow Cooker is Best for Reheating Ham
Most people reach for the oven by default, but the oven is a dry-heat environment. Even when covered with foil, the high temperatures required to heat a large mass of meat often dry out the exterior edges before the center reaches a safe temperature.
The slow cooker, by contrast, excels at “low and slow” heating. Because the lid traps steam, the moisture stays inside the ceramic pot. This is particularly important for spiral-sliced hams, which have more surface area exposed to the air and are prone to drying out. When you use a crockpot, you are essentially giving the ham a gentle steam bath, which preserves the integrity of the protein fibers and keeps every slice juicy.
Choosing the Right Ham for Your Slow Cooker
Before you begin, you need to ensure your ham actually fits. Not all hams are created equal, and not all slow cookers are sized the same.
Size and Shape Matters
Most standard oval slow cookers are 6 to 7 quarts. This size typically accommodates a 6 to 8-pound bone-in ham or a slightly larger boneless ham. If you have purchased a massive 12-pound “family feast” ham, you might find that the lid won’t close. Always check the weight on the packaging before you buy, keeping your slow cooker’s capacity in mind.
Bone-In vs. Boneless
A bone-in ham generally offers better flavor and a more traditional appearance. The bone also helps conduct heat to the center of the meat. However, boneless hams are much easier to fit into the pot and are easier to slice. Both work exceptionally well with the slow cooker method, though a bone-in ham may require a bit more maneuvering to get the lid to seat properly.
Pre-Sliced or Whole
Spiral-sliced hams are convenient because they are ready to serve the moment they are warm. The downside is that they can dry out faster. If you choose a spiral-sliced variety, you must be extra diligent about adding liquid to the bottom of the pot to create that necessary steam.
Preparing the Ham for the Pot
Once you have your ham, the preparation is minimal but crucial. Start by removing all packaging. Be sure to check for the small plastic disc that is often placed over the bone end; if you leave this on, it will melt and ruin your meal.
If your ham is too tall for the lid to close, don’t panic. You can trim a slice off the bottom to level it out, or you can use the “foil tent” method. Simply take a large piece of heavy-duty aluminum foil and wrap it tightly over the top of the slow cooker, crimping the edges around the rim of the pot to create a seal. Place the lid on top of the foil to weigh it down. This adds a few extra inches of clearance while still trapping the heat and moisture.
Adding Liquid and Flavor
You should never heat a ham in a slow cooker completely dry. Adding at least a half-cup to a full cup of liquid ensures the bottom doesn’t scorch and provides the humidity needed for the “steam effect.”
For a basic reheat, plain water works, but this is a missed opportunity for flavor. Consider using apple juice, pineapple juice, orange juice, or even a splash of ginger ale or apple cider. These liquids provide a subtle sweetness that complements the saltiness of the pork.
The Warming Process Step-by-Step
To achieve the best results, follow these specific steps to ensure your ham reaches the ideal serving temperature without overcooking.
-
Step 1: Position the Ham
Place the ham in the slow cooker. If it is a half-ham, place the flat, cut side down. This protects the most vulnerable part of the meat from direct heat and allows the juices to flow downward into the thickest parts of the muscle.
-
Step 2: Add Your Glaze
While many hams come with a glaze packet, making your own is simple. A mixture of brown sugar, Dijon mustard, and a bit of honey or maple syrup creates a classic crust. Rub the glaze all over the ham, ensuring it gets between the slices if you are using a spiral-cut ham.
-
Step 3: Set the Temperature
Always use the Low setting. While it might be tempting to use the High setting to speed things up, this increases the risk of the sugars in the glaze burning and the meat becoming tough. Slow and steady is the golden rule here.
-
Step 4: Timing
For a fully cooked ham, you are aiming to reach an internal temperature of 140 degrees Fahrenheit. Generally, this takes about 3 to 4 hours on the Low setting for an average-sized ham. Start checking the temperature with a meat thermometer at the 3-hour mark.
Monitoring the Internal Temperature
The only way to be certain your ham is ready is by using a digital meat thermometer. Insert the probe into the thickest part of the meat, making sure you do not hit the bone, as the bone conducts heat differently and will give you an inaccurate reading.
Since the ham is already cooked, you aren’t looking for “doneness” in the traditional sense, but rather “food safety” and “palatability.” Once the thermometer reads 140 degrees Fahrenheit, the ham is ready to be served. If you leave it in much longer, the meat will begin to fall apart—which is great for pulled pork, but less ideal for traditional holiday slices.
Serving and Carving
Once the ham has reached the target temperature, turn the slow cooker to the “Keep Warm” setting if you aren’t ready to serve immediately. However, try not to leave it on “Keep Warm” for more than an hour, as it can still slowly dry out the meat.
When it’s time to eat, remove the ham carefully using two large forks or sturdy tongs. Place it on a cutting board and let it rest for about 10 to 15 minutes. This resting period allows the juices to redistribute so they don’t all run out the moment you take a knife to the meat.
If you have leftover liquid in the bottom of the slow cooker, don’t throw it away. You can simmer it in a saucepan with a little cornstarch slurry to create a savory ham gravy or a thickened glaze to drizzle over the individual servings.
Creative Flavor Variations
If you want to move beyond the standard honey-glazed ham, the slow cooker is the perfect vessel for experimentation.
-
The Tropical Approach
Layer pineapple rings and maraschino cherries over the surface of the ham, securing them with toothpicks. Use pineapple juice as your base liquid. The acidity of the pineapple helps tenderize the meat while providing a bright, nostalgic flavor profile.
-
The Spiced Cider Method
Use unfiltered apple cider as the liquid and toss in two cinnamon sticks and a few whole cloves. This creates an aromatic, autumnal scent that fills the house and gives the ham a sophisticated, warm spice flavor.
-
The Maple Bourbon Glaze
Mix maple syrup with a splash of bourbon and a tablespoon of smoked paprika. This creates a deep, smoky, and slightly boozy glaze that pairs excellently with the saltiness of the ham.
Managing Leftovers
One of the best parts of warming a large ham is the leftovers. Once the meal is over, carve the remaining meat off the bone while it is still slightly warm. Store the meat in airtight containers or freezer bags.
Don’t forget the ham bone! The slow cooker is also the perfect tool for making ham and bean soup or split pea soup the following day. Toss the bone back into the pot with some dried beans, aromatics, and water, and let it simmer on low overnight for a rich, flavorful broth.
Frequently Asked Questions
- Can I put a frozen ham directly into the slow cooker?
- It is not recommended to put a completely frozen ham into a slow cooker. Because the slow cooker heats up slowly, the meat may spend too much time in the “danger zone” (between 40 degrees Fahrenheit and 140 degrees Fahrenheit) where bacteria can grow rapidly. It is best to thaw the ham completely in the refrigerator for 24 to 48 hours before reheating.
- How much liquid do I really need to add?
- You don’t need much, as the ham itself will release some moisture. Usually, 1/2 cup to 1 cup of liquid is sufficient. The goal is to create steam and prevent the bottom of the ham from sticking or burning, rather than boiling the meat.
- My ham is too big for the lid to close, what should I do?
- The most effective solution is to create a dome out of heavy-duty aluminum foil. Cover the top of the slow cooker tightly with the foil, ensuring no steam can escape from the sides. You can then place the lid on top of the foil to help hold it in place. This effectively extends the height of your slow cooker.
- How long does it take to warm a ham on the Low setting?
- On average, a fully cooked ham will take roughly 15 to 20 minutes per pound to reach the desired internal temperature of 140 degrees Fahrenheit when using the Low setting. For a standard 6 to 8-pound ham, this typically translates to 3 to 4 hours.
- Can I use the High setting to save time?
- While you can use the High setting, it is generally discouraged for spiral-sliced hams as they are very sensitive to heat and will dry out quickly. If you must use the High setting, check the internal temperature frequently and consider adding a bit more liquid to the pot to compensate for the higher evaporation rate.