Slow Cooker Leek Soup is the perfect comfort soup, especially during colder weather. The soup is creamy, hearty and combines potatoes, leeks, bacon and broth. Easily made in the slow cooker for the whole family to enjoy!

We love hearty and delicious soups made in the slow cooker. You can also check out the delicious Slow Cooker Chicken Wild Rice Soup and Slow Cooker Chicken Soup. They are incredibly easy to make and full of flavor.

Slow Cooker Leek Soup ingredients in a crock pot

Slow Cooker Leek Soup


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Slow Cooker Leek Soup is flavorful, nutritious and pretty easy to make. This soup is a staple in our house, and every family member loves it. If you haven’t tried leeks before, this is a perfect opportunity to start and experiment its flavor.

Leeks have the look of a green onion, but are large in size. They also taste pretty similar; however leeks have a milder flavor. Mixing leeks with potatoes in a soup is a winning combination. 

This leek soup calls for heavy cream to balance off the flavors nicely. It is what gives this soup a hearty and creamy texture. If you are short on heavy cream, you can use whole milk as well. The bacon is optional, but it add a deep smoky flavor that is absolutely beautiful.

Slow Cooker Leek Soup in a ladle with a Crock-Pot in the background

Are leeks good for you?

Leeks are vegetables from the allium family. Other types of vegetables that are related to the leek are onions and garlic, as well as shallots, scallions and chives.

While they resemble the green onion, leeks are larger in size. In addition, they have a milder flavor which makes them a perfect ingredient to many dishes. You can use leeks in salads, soups, or in sandwiches. They are full of vitamins and minerals. 

What kind of potatoes should I use in this potato leek soup recipe?

We recommend using russet or yukon gold potatoes in this leek and potato soup because they have a high starch content. The starch helps the soup to thicken during cooking so they are ideal for creamy soups.

If however you can’t find either of these potatoes in your store, you can use any other potatoes. This leek and potato soup will taste just as good either way! 

What is the best way to clean leeks?

  • Start by slicing off the top dark green part, leaving only the white and light green part. This is the main part used in soup.
  • Then, slice off the bottom where the root ends. It is usually dirty, so you want to avoid using this part in cooking.
  • Next, slice the stalk lengthwise in half, and rinse under cold water.
  • Cut in small cubic shaped sizes.

Slow Cooker Leek Soup in a bowl garnished parsley and bacon

How long does potato leek soup last in the fridge?

To store the soup in the fridge, make sure it is completely cooled down. Then, transfer to a container that has a good seal. It is best to keep refrigerated for up to 3 days. 

Can I freeze leek and potato soup?

  • Absolutely! It is best to freeze this potato leek soup before the cream is added because it will become soggy once frozen. Transfer the soup to an airtight container, and freeze it for up to 3 months. 
  • Defrost the soup in the refrigerator for 12 hours before serving. Then reheat it on the stovetop over medium heat for 10-15 minutes, or until hot. Once the soup is heated, add the heavy cream to it, and bring the soup to a simmer before serving. 

Slow Cooker Leek Soup in a bowl with a spoon

Enjoy making this delicious and creamy potato leek soup recipe! It is a heartwarming and home cooked delight that is comfort food at it’s best!

More Soup Recipes to Enjoy!

Minestrone Soup

Ham and Potato Soup

Beef and Tomato Macaroni Soup

Chicken Pot Pie Soup

Crockpot Corn Chowder with Potatoes and Bacon

Slow Cooker Leek Soup in a ladle with a Crock-Pot in the background
5 from 8 votes↑ Click stars to rate now!
Or to leave a comment, click here!

Slow Cooker Leek Soup

Slow Cooker Leek Soup is the perfect comfort soup, especially during colder weather. The soup is creamy, hearty and combines potatoes, leeks, bacon and broth.
Prep Time 20 minutes
Cook Time 2 hours 30 minutes
Total Time 2 hours 50 minutes
Servings 6 servings
Author Catalina


  • 8 slices cooked bacon finely chopped
  • 2 leeks chopped
  • 1 medium onion diced
  • 4 cloves garlic minced
  • 1.5-2 lbs russet potatoes peeled and cubed
  • 1 cup diced carrots
  • 1 cup diced celery
  • 1 teaspoon dried thyme
  • ¼ teaspoon salt or to taste
  • ¼ teaspoon ground black pepper or to taste
  • 4 cups chicken broth low sodium - use veggie broth for a vegetarian version
  • 2 cups cream
  • ½ cup sour cream

Cornstarch Mix:

  • 2 tablespoons cornstarch
  • 4 tablespoons water


  • Cheddar cheese shredded
  • Bacon chopped
  • Parsley chopped


  • Clean, wash and chop leeks. Peel, wash and cube the potatoes. Prepare the rest of the veggies.
  • Add chopped bacon, chopped leeks, cubed potatoes, diced onion, chopped carrots, chopped celery and minced garlic to a 6qt slow cooker.
  • Add seasoning: salt, pepper and thyme. Add broth. Stir to combine.
  • Cover and cook on low for 4 hours or on high for 2 hours.
  • Add cream and sour cream. Stir to combine.
  • Use a potato masher, to mash some of the potatoes, still leaving some chunks for texture.
  • Taste and adjust for salt and pepper.
  • Mix cornstarch with water until cornstarch is fully dissolved and add the mixture to the soup. Stir to combine. If the soup is too thick, add more cream or broth.
  • Cover and cook for another 30 minutes on high.
  • Serve with favorite toppings.
5 from 8 votes↑ Click stars to rate now!
Or to leave a comment, click here!

Nutrition Information

Calories: 509kcal | Carbohydrates: 35g | Protein: 9g | Fat: 37g | Saturated Fat: 21g | Cholesterol: 129mg | Sodium: 940mg | Potassium: 938mg | Fiber: 3g | Sugar: 4g | Vitamin A: 5420IU | Vitamin C: 25.4mg | Calcium: 139mg | Iron: 2.4mg

Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.

Course Main Course
Cuisine American

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About the author

Catalina thinks that time in the kitchen should be fun, and we should spend less time cooking and more time eating! As a successful business woman, with a busy career on Wall Street, she develops easy weeknight meals that you can make in 30 minutes or less!. Catalina lives in the NYC metro area with her husband, who is also a great cook, and their 4 year old boy, who gladly helps in the kitchen. Catalina will inspire you to experiment with flavors, try new ingredients and create easy meals with less effort. You can visit her blog Sweet & Savory Meals for more inspiration.
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Recipe Rating


  1. 5 stars
    This soup was yummy. I followed the recipe exactly and it turned out perfectly. While it was cooking the thyme was very permeating and a little overpowering. I was afraid that it was too much and had ruined the soup after all that time chopping. But, lo and behold, when it was finished, it was perfect, not overpowering at all. I highly recommend this soup.