Slow Cooker Corned Beef is tender, flavorful, and incredibly easy to prepare. Cooked low and slow with just a few simple ingredients, the brisket turns out juicy and well seasoned every time.

Using a slow cooker is one of the simplest ways to make this classic comfort-dinner. Let the slow cooker do the work while you go about your day — the meat becomes melt-in-your-mouth tender and absorbs the pickling spices for a rich flavor.

Sliced corned beef on a white plate next to a fork, with cooked onions in the background.

This method works great for holidays or a cozy weeknight dinner. Serve with potatoes, carrots, and cabbage for a traditional plate, or use leftovers for sandwiches, sliders, or corned beef hash.

Sliced corned beef next to cooked onions on a wooden cutting board.

Ingredients You’ll Need

Scroll to the recipe card below for the full printable version.

Corned beef brisket
Onion
Potatoes

Sliced corned beef on a wooden cutting board.

Slow Cooker Corned Beef

Enjoy rich, succulent slow cooker corned beef served with tender potatoes and savory onions. This simple recipe uses just a few ingredients and requires only minutes of hands-on prep.

Prep: 5 mins |
Cook: 8 hrs |
Total: 8 hrs 5 mins |
Servings: 8

Ingredients

3–4 pound corned beef brisket (with seasoning packet)
1 ½ cup water (or beef broth for richer flavor)
1 onion, cubed
1 pound potatoes, peeled and chopped (or baby potatoes, halved)

Instructions

Remove the corned beef brisket from its packaging and discard the liquid. Keep the seasoning packet and do not rinse the meat. Place the brisket in the slow cooker, fat-side up.
Sprinkle the seasoning packet over the brisket. Pour the water (or broth) around the edges of the meat so the seasoning stays on top. Add the chopped onion to the cooker. Cover and cook on low for 8 hours.
After about 4 hours, add the potatoes to the slow cooker so they can finish cooking with the meat.
If you’d like to include cabbage, coarsely chop it and add it during the last 30 minutes of cooking.
When cooking is complete, transfer the meat and vegetables to a cutting board or serving platter. Slice the brisket against the grain and serve with the potatoes and onions.

Notes

For a deeper, beefier flavor, use beef broth instead of water.
Baby or waxy potatoes hold their shape best in slow cooking. If using russets, peel and chop them carefully to avoid them breaking down.

Nutrition

Approximate per serving: Calories 713 • Carbohydrates 13 g • Protein 67 g • Fat 42 g • Saturated Fat 17 g • Cholesterol 240 mg • Sodium 117 mg • Fiber 1 g • Sugar 1 g

Nutrition information is an estimate and should be used as a guideline only.

How to Make Slow Cooker Corned Beef

Prepare the brisket. Remove the meat from the package, keep the seasoning packet, and place the brisket in the slow cooker. Do not rinse.
Combine and cook. Sprinkle the seasoning over the meat, pour the water or broth around the edges, add chopped onion, cover, and cook on low for 8 hours. Add potatoes at the 4-hour mark.
Optional cabbage. Add chopped cabbage for the final 30 minutes if desired.
Serve. Remove the brisket and vegetables, slice the beef against the grain, and plate with the potatoes and onions.

Corned beef brisket inside the slow cooker.

Chopped onions added over top of corned beef brisket in the slow cooker.

Recipe Tips & Suggestions

Don’t rinse the beef. Place the brisket straight from the package into the cooker after discarding the brine; rinsing washes away seasoning and flavor.
Slice against the grain. Cutting across the muscle fibers gives the most tender slices.
Choose waxy potatoes. Varieties like baby potatoes hold their shape during long, slow cooking better than starchy russets.

Cooked corned beef, onions, and potatoes inside the slow cooker.

Frequently Asked Questions

Should I place the beef fat-side up or down in the slow cooker?

Place the brisket fat-side up so the melting fat bastes the meat as it cooks.

Do I need to cover corned beef with water in the slow cooker?

Yes. Use enough water or broth so the brisket is mostly submerged and flavors can circulate around the meat.

Why is my slow cooker corned beef tough?

Toughness can result from undercooking or overcooking. A 3–4 pound brisket typically needs about 8 hours on low; start checking for tenderness after 7 hours and adjust as needed.

Storing and Reheating Leftovers

Store meat and vegetables together or separately in airtight containers. Refrigerate for up to 3–4 days. Reheat gently in the oven or microwave. Sliced leftover brisket is excellent in sandwiches, or dice it for a corned beef hash.

Freezing

Leftovers freeze well for 2–3 months when stored airtight. Thaw overnight in the refrigerator before reheating.

More Easy Slow Cooker Recipes

Mississippi Pork Roast
Slow Cooker Chicken Drumsticks
Crockpot Chicken and Gravy
Slow Cooker Pork Roast
Crockpot Potato Soup
Slow Cooker Italian Beef Sandwiches