Slow Cooker Split Pea Soup with Ham (Thick, Smoky, Old Fashioned)

Slow cooker split pea soup with ham is the definition of a low effort, high reward dinner. Dried split peas, a smoky ham bone, carrots, celery and onion go into the pot in the morning, and by evening you have a thick, savory soup that tastes like it took real work.

Split peas need no soaking, which makes them perfect for the slow cooker. Over 8 hours on LOW they collapse into a naturally creamy base without any dairy or thickener.

This is also one of the best uses for a leftover holiday ham bone. The bone gives the broth body and a deep smoky flavor while the meat clinging to it becomes tender shreds.

If you do not have a bone, a smoked ham hock or diced ham steak gets you there too.

Why this recipe works

• Split peas break down completely over a long cook, so the soup thickens itself.
• A ham bone or hock releases collagen and smoke into the broth, giving it richness that diced ham alone cannot.
• Carrots, celery and onion are cut small so they soften into the soup rather than staying as chunks.
• A bay leaf and thyme add depth without competing with the ham.
• A splash of vinegar at the end brightens a soup that is otherwise very earthy.

Ingredients you’ll need

Dried green split peas are the star. One pound, sorted and rinsed, makes a generous pot. A ham bone with some meat on it, or a smoked ham hock plus diced ham, provides the smoky backbone.

Onion, carrots and celery are the aromatic base. Garlic, bay leaf and dried thyme season the pot. Low sodium chicken broth and water make up the liquid.

At the end, a little black pepper and a teaspoon of apple cider vinegar or lemon juice pull it all together. Salt goes in last, because ham varies so much in saltiness.

The shopping list is short and cheap. A bag of split peas costs a couple of dollars and the vegetables are pantry basics. If you already have a ham bone in the freezer, the whole pot costs very little to make.

Ingredient notes and smart substitutions

Split peas

Green split peas give the classic color and a slightly sweet, earthy flavor. Yellow split peas work the same way and taste a touch milder. Use 1 pound, about 2 1/4 cups. Pick through them for small stones and rinse well. Do not soak. Check the package date. Peas that are more than two years old can stay stubbornly firm.

Ham bone or hock

A leftover bone from a spiral or baked ham is ideal. It should have at least a cup of meat still attached. If you do not have one, use one or two smoked ham hocks plus 1 1/2 cups of diced cooked ham. The hocks give the smoke and the diced ham gives you meat in every bowl. Ham hocks and bones are already cooked, but if you use raw pork of any kind, it must go in fully thawed.

Broth and water

Use 4 cups of low sodium chicken broth and 2 to 3 cups of water. All broth makes the soup too salty once the ham releases its seasoning. All water makes it a little flat.

Vegetables

Two carrots, two celery stalks and one onion is the standard mirepoix. Dice them 1/4 inch so they melt into the soup. A diced Yukon Gold potato is a traditional addition that adds body.

Herbs and seasonings

One bay leaf and 1 teaspoon of dried thyme is all this soup needs. Fresh thyme sprigs work too. A pinch of smoked paprika is a good addition if your ham is mild.

Finishing acid

One to two teaspoons of apple cider vinegar or fresh lemon juice at the end make the soup taste brighter and less heavy. It is not optional if you want the flavor to pop.

How to make it

1. Sort and rinse the peas

Spread the split peas on a sheet pan and pick out any stones or shriveled peas. Rinse in a fine mesh strainer under cold water until the water runs clear.

2. Load the slow cooker

Add the peas, diced onion, carrots, celery, garlic, bay leaf and thyme to a 6 quart slow cooker. Nestle the ham bone or hocks into the center. Pour in the broth and water. Do not add salt yet.

3. Cook low and slow

Cover and cook on LOW for 8 to 9 hours or on HIGH for 4 1/2 to 5 1/2 hours. Leave the lid alone. Each lift lets out heat and adds time. The soup is done when the peas have completely broken down and the soup is thick enough to coat a spoon.

4. Remove the bone and shred the meat

Lift out the ham bone or hocks and set them on a cutting board to cool for 10 minutes. Pull off all the meat, discard the bone, skin and fat, and chop or shred the meat into bite sized pieces.

5. Adjust the texture

Stir the soup well. The peas usually collapse on their own, but if you want it smoother, mash with a potato masher or pulse an immersion blender a few times. If it is thicker than you like, stir in hot water 1/2 cup at a time.

6. Season and finish

Return the ham to the pot along with any diced ham you are adding. Stir in the vinegar and black pepper, then taste. Add salt 1/4 teaspoon at a time until the flavor is rounded. Remove the bay leaf.

7. Serve hot

Ladle into bowls and finish with a drizzle of good olive oil, a few croutons or a little extra black pepper. The soup will thicken further as it sits.

If you have the time, let the soup rest with the lid off for 10 minutes before serving. It settles slightly, the surface loses its foam, and the flavor of the ham comes forward as it cools a few degrees from piping hot.

Homemade croutons are a nice touch. Cube two slices of stale bread, toss with a tablespoon of olive oil and a pinch of salt, and toast in a skillet for 5 minutes while you shred the ham.

Common mistakes and how to fix them

The peas are still firm after the full time. The peas may be old, or the pot may have been opened too often. Keep cooking on HIGH in 30 minute increments, and buy a fresh bag next time. Hard water can also slow softening.

The soup is too salty. Ham bones vary widely. Stir in a peeled, diced potato and cook on HIGH for 30 minutes to absorb some salt, or dilute with water. Always wait until the end to add salt.

The soup is too thick. This is normal, especially the next day. Thin with hot water or broth until it reaches the consistency you want.

The soup is thin. It needs more time. Cook uncovered on HIGH for 30 to 45 minutes, or mash a portion of the peas to release more starch.

The flavor is dull. Add the vinegar. Then add salt and pepper. Split pea soup needs acid to taste like more than the sum of its parts.

Timing and make ahead plan

Prep takes about 15 minutes: rinse the peas, dice the vegetables and mince the garlic. Everything can be prepped the night before and stored in the refrigerator.

Do not combine the peas with the liquid ahead of time. Long soaking is not needed and can make them cook unevenly. Add the liquid in the morning right before you turn the slow cooker on.

The soup holds well on WARM for up to 2 hours. Stir occasionally and thin with water if it thickens too much.

This is an excellent make ahead meal. The flavor improves overnight in the refrigerator, and it reheats gently with a little water. Plan to make it a day before you serve it if you can.

For a full workday, set a programmable slow cooker for 9 hours on LOW before leaving. It will hold on WARM until you return. Pulling the meat from the bone and seasoning takes about 15 minutes, which is just enough time to warm some bread and set the table.

Tips for the best slow cooker split pea soup

• Buy fresh split peas. Check the date on the bag and skip anything that has been in the pantry for years.
• Dice the vegetables small. Big chunks stay chunky while the peas turn to velvet, and the texture ends up uneven.
• Salt last. Ham releases a lot of seasoning over 8 hours and you cannot take salt back out.
• Skim the surface if a layer of fat rises from the bone. A spoon or a folded paper towel does the job.
• Finish with acid and pepper. These two ingredients are the difference between a fine soup and a great one.

Variations

• Vegetarian: Skip the ham and use vegetable broth. Add 1 teaspoon of smoked paprika and a tablespoon of soy sauce for depth.
• Smoked sausage: Replace the ham with 12 ounces of sliced smoked kielbasa added for the last hour.
• Yellow pea and curry: Use yellow split peas and add 1 tablespoon of curry powder with the thyme. Finish with lemon instead of vinegar.
• Potato and leek: Add one diced Yukon Gold potato and swap the onion for two sliced leeks.
• Extra smoky: Add 4 slices of chopped bacon with the vegetables at the start.

Equipment that makes this easier

A 6 quart slow cooker gives the peas room to expand and the bone room to sit in the liquid. A programmable model that switches to WARM is ideal for a full workday cook.

A fine mesh strainer makes rinsing the peas fast. A potato masher or an immersion blender lets you adjust the final texture in seconds.

Tongs are useful for lifting a hot ham bone out of the pot, and a fat separator or a wide spoon helps skim any grease that rises.

None of these are strictly necessary. A colander rinses peas well enough, a fork can mash them, and a large spoon lifts the bone out safely if you go slowly.

Scaling up or down

To halve the recipe, use 1/2 pound of peas, one ham hock or 1 1/2 cups of diced ham, and half the vegetables and liquid in a 3 or 4 quart slow cooker. Timing stays roughly the same.

To double it, use an 8 quart slow cooker and keep the pot no more than two thirds full. Add about an hour on LOW because the larger mass heats slowly. Two ham hocks or one large bone is plenty for a doubled batch.

As written, the recipe makes about 8 servings of 1 1/2 cups. It is a thick soup, so portions feel generous.

What to serve with it

Crusty bread, buttered toast or warm cornbread are the natural partners. A crisp green salad with a mustard vinaigrette cuts the richness.

For a cozy soup week, rotate this with hearty lentil soup and slow cooker loaded potato soup. If you are working through a holiday ham, the leftover meat also goes into red beans and rice.

How to store, freeze and reheat

Refrigerator: Cool within 2 hours and store in airtight containers for up to 5 days. It will set up almost like a purée when cold. That is normal.

Freezer: Split pea soup freezes extremely well for up to 3 months. Portion into containers or freezer bags, leaving room for expansion. Freeze flat for easy stacking.

Reheating: Warm on the stovetop over medium low heat with a splash of water or broth, stirring often, until it reaches 165°F throughout. In the microwave, heat in 90 second bursts and stir between each. Thaw frozen soup overnight in the refrigerator first.

Reheated soup often needs a fresh pinch of salt and a few drops of vinegar to taste as bright as it did on day one.

Leftover ideas

Thick leftover split pea soup makes a surprisingly good sauce for roasted potatoes or a bed for a fried egg. Thin it slightly and pour it over toasted bread for a rustic open faced lunch.

You can also stir a cup into cooked rice with a little butter, or use it as a filling for savory hand pies with a sheet of store bought pie dough.

Nutrition notes

One 1 1/2 cup serving lands roughly between 300 and 380 calories, with about 20 grams of protein and 14 to 18 grams of fiber from the peas. Split peas are one of the highest fiber legumes, which is why this soup is so filling.

The numbers vary with how much ham you use and how salty it is. Sodium can be high with a cured ham bone, so use low sodium broth and salt sparingly if that is a concern.

Frequently asked questions

Do split peas need to be soaked before slow cooking?

No. Split peas are small and cook to tenderness in 8 to 9 hours on LOW without soaking. Just sort out any stones and rinse them well.

Why are my split peas still hard?

The peas are probably old. Dried peas that have sat for years lose the ability to soften. Keep cooking on HIGH in 30 minute increments, and buy a fresh bag next time. Very hard water can also slow things down.

Can I make split pea soup without a ham bone?

Yes. Use one or two smoked ham hocks for the smoky flavor plus 1 1/2 cups of diced cooked ham for meat in every bowl. You can also use sliced kielbasa or skip the meat entirely and add smoked paprika.

How do I fix split pea soup that is too salty?

Stir in a peeled, diced potato and cook on HIGH for 30 minutes to absorb some of the salt, or dilute with water. Always add salt at the end, because ham bones vary widely in saltiness.

Can I freeze split pea soup?

Yes. It freezes very well for up to 3 months. Thaw overnight in the refrigerator, then reheat gently with a splash of water and a fresh pinch of salt and vinegar.