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Crockpot Spaghetti Sauce

5 from 4 votes

posted: 08/20/23

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This post may contain affiliate links. Please read my disclosure policy

This Crockpot Spaghetti Sauce isn’t just easy to make. It is also absolutely delicious, and makes your house smell amazing.

overhead of a bowl of spaghetti with crockpot spaghetti sauce on it

I remember going to my grandparents’ house and walking in to the amazing smell of a simmering sauce. It was made with tomatoes they had grown in their garden and was bubbling away most the day.

In a world where I want something reminiscent of my grandparents’ sauce but where the time to make it doesn’t exist for me, this Crockpot Spaghetti Sauce is the perfect answer. It simmers away in the slow cooker, allowing me to come and go, but it is has that deep rich flavor.

How to Make Crockpot Spaghetti Sauce

This is just a brief overview of how to make this delicious sauce. For the full recipe with all of the measurements, see the recipe card at the bottom of the post.

  1. Combine all of the ingredients in the slow cooker. Cook on low for three to four hours.
  2. Taste and adjust. At the end of the cooking time, taste your sauce and decide if it needs more salt, pepper, sugar, or red pepper flakes.
overhead of a slow cooker full of ingredients to make spaghetti sauce before they are mixed together

Sugar in Spaghetti Sauce

I often get asked why I put sugar in my spaghetti sauce. Tomatoes, by nature, have a lot of acidity to them. This is especially noticeable with canned tomatoes. Just a little bit of sugar helps to balance the acid.

Try to think of it like the scale that Lady Justice is holding. One one side is the acidity of the tomatoes – almost a bitterness. We are adding just enough sugar to the other side of the scale so that both sides are level with each other. Too much sugar and it will weigh down the sugar side and make the sauce sweet. Not enough sugar, and the acidic tomatoes win out. When you add just the right amount, you don’t taste sweetness or acidity, just the wonderful flavors of the sauce.

This recipe calls for 2 teaspoons of sugar, but if at the end of the cooking time you still taste that bitterness from the tomatoes, add another 1/2 teaspoon in.

overhead of a slow cooker with crockpot spaghetti sauce recipe in it

Using Canned Tomatoes

We are using canned tomatoes in this recipe. While I do not believe they are as good as fresh tomatoes from my garden, I think they can still make a delicious sauce. And using canned saves so much time.

Draining Diced Tomatoes

You will notice that in this recipe we are draining the diced tomatoes. This is different from my easy Homemade Spaghetti Sauce, where nothing gets drained. The reason behind this difference is that in the slow cooker there will be much less moisture lost. So we want to start the recipe with less.

If your family doesn’t like chunky tomato sauce, consider that the pieces of tomato break down quite a bit during cooking. If it is still too chunky, you could transfer the finished sauce to a blender or use an immersion blender.

Variations on Crockpot Spaghetti Sauce

  • Add in onions. Most spaghetti sauce has a diced onion in it. It’s just that it was in my marriage vows not to use onions. But simply add one at the beginning. A raw onion will cook away in the sauce and come out perfectly.
  • Add other vegetables. In addition to onion, you could add other great vegetables. I would consider adding carrots and red bell peppers. Keep in mind that vegetables like zucchini will add a lot of water to the recipe. You may want to sauté it before adding it.
  • Make it a meat sauce. You can brown some ground beef or Italian sausage before making this and add it to the crockpot at the beginning of the cook time for a great spaghetti meat sauce.
  • Spice up the spaghetti sauce. We are already calling for 1/8 of a teaspoon of red pepper flakes. I you want to take it up a notch you could add more.


How do you thicken spaghetti sauce made in the crockpot?

This sauce was specifically designed to be as thick as sauce made on the stovetop. Since we don’t have the simmering to remove liquid, we are starting with less by draining the diced tomatoes.

Can this recipe be doubled?

Yes! Double all of the ingredients, drain the diced tomatoes well, and add one hour to the cooking time.

How much spaghetti sauce does this recipe make?

This recipe makes 3 cups.

Can I can this spaghetti sauce?

Yes! But I don’t have enough canning knowledge to tell you how to do it safely. I recommend following the canning guidelines put out by the USDA.

Can I make this spaghetti sauce in my Instant Pot?

Honestly, I tried so many times to make this in the Instant Pot, and I just wasn’t satisfied with the taste. The tomato sauce scorches so easily leaving the whole sauce with a very bitter taste.

mason jar with slow cooker spaghetti sauce

Recipes to Use Slow Cooker Spaghetti Sauce

If you make this Crockpot Spaghetti Sauce recipe or any of my other recipes, leave me a comment and let me know what you think.

overhead of a slow cooker with crockpot spaghetti sauce recipe in it
5 from 4 votes

Crockpot Spaghetti Sauce Recipe

Serves: 3 cups
(tap # to scale)
Prep: 5 minutes
Cook: 3 hours
Total: 3 hours 5 minutes
This Crockpot Spaghetti Sauce isn't just easy to make. It is also absolutely delicious, and makes your house smell amazing.


  • 4 garlic cloves minced
  • 28 ounces crushed tomatoes
  • 15 ounces diced tomatoes drained
  • 2 tablespoons tomato paste
  • 2 teaspoons granulated sugar read here about why we add sugar to spaghetti sauce
  • 1 teaspoon kosher salt
  • 1 teaspoon dried oregano
  • 1 teaspoon dried basil
  • 1/8 teaspoon crushed red pepper flakes optional
  • dash of freshly ground black pepper


  • Combine all of the ingredients in your slow cooker and cook on low for three to four hours. Taste at the end and adjust the sugar, salt, or pepper as needed.
  • Use immediately or store in the refrigerator for 4 to 5 days.


The diced tomatoes make for a nice chunky sauce.  If your family doesn’t dig on chunks, replace the diced tomatoes with a second can of crushed tomatoes.
Author: Lisa Longley
Course: Main Course
Cuisine: American
overhead of a slow cooker with crockpot spaghetti sauce recipe in it

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Crockpot Spaghetti Sauce Recipe

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Hi! I'm Lisa Longley, and I am committed to giving you simple dinner ideas and recipes that are easy to make; recipes that will fill your home with joy. I am the owner and author of SimpleJoy.com and I'm so glad that you are here.

Reader Interactions


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    I would like to know. Can this be frozen after being made? How do I do it?

    • Lisa Longley says

      Yes! This is a great recipe to freeze. Put it in a container with at least 1 inch at the top for it to expand. Then you can store it in the freezer for up to three months.

  2. Laurie says

    This sounds easy as can be. I love new crockpot ideas. Thank you. Will try! We love pepper/onions/mushrooms. I’ll be adding that as well

    • Lisa Longley says

      I hope you enjoy it!

  3. Jackie says

    I can’t rate your recipe because I have not made it, but it sounds great. I have been making my sauce in the crock pot for years. You don’t have to watch it or stir it. I use fire-roasted tomatoes, tomato sauce & paste & both regular sugar & brown sugar. I also use my crock pot to make the sauce for mostaccioll, soups, stew, anything that needs to simmer & I let it cook most of the day.

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5 Secrets to Stress Free Dinners