Can you heat a spiral ham in a slow cooker, the way the spiral ham recipes slow cooker pages promise? USDA’s slow cooker page says reheating cooked food in a slow cooker is not recommended, so for our fully cooked spiral sliced ham the answer is: heat it in the oven by the package, then use the slow cooker only to hold it hot at 140°F or above.
That is a shorter answer than those recipes give, and it is the one the package and the USDA pages we cite support. Below is what the USDA page says, the two temperature cases and their sources, the package’s oven method, how the slow cooker fits in as a warmer, and why we do not publish a low for hours version.
- What USDA says, and two different cases
- Heat it in the oven by the package
- Then hold it warm in the slow cooker
- Why we do not give a low for hours recipe
- Questions people ask
Spiral ham recipes, slow cooker version: what USDA says, and two different cases
USDA’s Slow Cookers and Food Safety page says, in its leftovers section: “Reheating leftovers in a slow cooker is not recommended. Cooked food should be reheated on the stove, in a microwave, or in a conventional oven until it reaches 165 °F. Then the hot food can be placed in a preheated slow cooker to keep it hot for serving, at least 140 °F as measured with a food thermometer.”
The same page says a slow cooker “may take several hours to reach a safe, bacteria-killing temperature,” and its reminders include “Always thaw meat or poultry before putting it into a slow cooker.” That is the reason we do not put a cold ham in a slow cooker to heat it.
Two temperature cases, kept apart. A whole, packaged, fully cooked ham heated from the refrigerator follows its package: ours says 325°F, covered, 10 minutes per pound, to about 135°F. Leftover ham that has been carved and stored follows USDA’s leftovers rule above: reheat to 165°F on the stove, in the microwave, or in the oven.
The 165°F figure is for leftovers; it is not the package’s endpoint for the whole ham, and we do not mix the two.
For the whole ham, USDA’s hams and food safety page gives its own oven rule: cooked hams packaged in USDA inspected plants are reheated to 140°F, in an oven set no lower than 325°F, with spiral sliced hams covered in foil at about 10 minutes per pound. Neither that page nor the USDA slow cooker page gives a slow cooker method for a spiral ham (both read 2026-09-19), so we do not either.
Heat the spiral ham in the oven, by the package
Our package says: preheat the oven to 325°F, prepare and apply the included honey glaze if desired, place the ham in a pan and cover it with foil, and heat 10 minutes per pound or until the center reaches approximately 135°F. The ham is 6 to 10 lb, so that is 60 to 100 minutes, and we laid the weights out in our spiral ham cooking time chart.
Thaw it first, in the refrigerator, per the USDA hams page; the days it takes depend on the weight. The glaze packet goes on before heating, per the package, and how to cook a spiral ham walks through the whole method with the package’s 135°F beside USDA’s general 140°F.
Then hold it warm in the slow cooker
This is where the slow cooker earns its place on Easter Sunday: once the ham is heated in the oven, USDA’s page allows placing hot food in a preheated slow cooker to keep it hot for serving, at least 140°F as measured with a food thermometer. Holding is not reheating; the ham goes in already hot. Preheat the cooker while the ham is in the oven, move the ham over, keep the lid on, and check the temperature with a thermometer.
Two limits. USDA’s page says to consult your cooker’s instruction booklet for the size of meat it can take, and a 6 to 10 lb half ham does not fit every cooker; if it does not fit, hold it in the oven instead, covered. And 140°F is the floor for holding, so if the thermometer reads lower, the ham is not being held safely.
| Method | Temperature | Time | Source |
|---|---|---|---|
| Whole packaged ham, oven, covered with foil | 325°F to about 135°F in the center | 10 minutes per pound | Our package |
| Whole ham, USDA general rule | Oven no lower than 325°F, ham to 140°F | About 10 minutes per pound, covered | USDA hams page |
| Leftover carved ham | Reheat to 165°F on the stove, in the microwave, or in the oven | Until 165°F | USDA slow cooker page (leftovers) |
| Slow cooker as a warmer | Preheated; hold at 140°F or above by thermometer | After oven heating, for serving | USDA slow cooker page |
| Slow cooker on low for hours | Varies by recipe | Varies by recipe | Not recommended by USDA; not tested by us |
Why we do not give a low for hours slow cooker recipe
The recipe posts that rank for this search heat a spiral ham on low for a few hours with a glaze and some liquid. We have not tested any of them on our ham, the package gives an oven method only, and USDA’s page says to reheat cooked food another way. Three reasons is enough for us to leave it out.
Where a slow cooker does belong with heritage pork is a raw cut that cooks for hours, and our older post on slow cooking with heritage breed pork covers that. A fully cooked spiral ham is a different job: it needs heating, not cooking.
Questions people ask about spiral ham recipes for the slow cooker
What is the best way to cook a spiral ham so it doesn’t dry out?
Heat it covered. Our package says to cover the ham with foil and heat 10 minutes per pound at 325°F to about 135°F, and USDA’s spiral ham instruction also says to cover it with foil.
Can you heat a spiral ham in a crockpot?
USDA does not recommend reheating cooked food in a slow cooker, so we do not give a crockpot heating time. Heat the ham in the oven at 325°F for 10 minutes per pound by the package, then hold it in a preheated slow cooker at 140°F or above if you need to.
Can I use the glaze packet in a crockpot spiral ham recipe?
Our package says to prepare and apply the glaze before heating in the oven. It gives no slow cooker step, so we do not give one either.
What are common mistakes when using a slow cooker for ham?
Per USDA’s slow cooker page: putting frozen meat in (always thaw first), reheating cooked food in it instead of the oven, stove, or microwave, and holding food below 140°F. Per the leftovers rule, carved leftover ham is reheated to 165°F, not held from cold.
Oven to heat, slow cooker to hold. That is our answer to spiral ham recipes, slow cooker style: yes to the crockpot as a warmer, no to it as the oven, which is what the package and USDA support.
Check availability on the spiral sliced ham, or see what is in the farm shop today.