Last updated on May 13th, 2026 at 12:19 am

If your garden is overflowing with fresh tomatoes, this canned spaghetti sauce is one of the best ways to preserve that harvest into a shelf-stable, ready-to-use meal.

This recipe walks you through exactly how to make spaghetti sauce from fresh tomatoes and safely can it using a water bath canner. It’s thick, rich, and perfectly seasoned so you can open a jar months from now and have a homemade dinner on the table in minutes.

On our one-acre homestead, this is one of those recipes I make in big batches during peak tomato season because it saves so much time later. Instead of starting from scratch on busy nights, I can just grab a jar and dinner is halfway done.

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How To Turn Tomato Sauce Into Spaghetti Sauce

Start by processing your fresh tomatoes into a simple tomato sauce first. If you haven’t done that yet, follow my tomato sauce recipe for the fastest and easiest way to go from fresh tomatoes to a smooth tomato puree.

Once your tomato sauce is ready, this is where we build it into a rich, homemade spaghetti sauce.

Pour the tomato sauce into a large pot and bring it up over medium heat. Let it simmer and reduce so the sauce thickens before adding seasonings. This step is what takes it from a basic tomato sauce to a thicker, more developed pasta sauce.

From there, you’ll add tomato paste, onion powder, and Italian seasoning to create that classic flavor and continue simmering until it reaches the consistency you want.

Why I Make This Every Year

I make this canned spaghetti sauce every year during tomato season using fresh garden tomatoes and a simple water bath canning method. Over time, I’ve adjusted the cooking process to get a thicker sauce, better flavor, and consistent results in sealed jars. This is the same method I use in my own kitchen for long-term pantry storage.

What You’ll Need

Large pot or dutch oven
Wooden spoon
Water bath canner or water-bath canner
Jar lifter
Mason jars (pint or quart jar)
Lids and rings
Canning funnel
Large saucepan (optional for smaller batches)

Ingredients For Homemade Spaghetti Sauce

Tomato puree or canned tomato sauce
Tomato paste
Olive oil (optional)
Garlic powder
Onion powder
Italian seasoning
Black pepper
Fresh herbs like fresh basil (optional)
Dried herbs
Bell peppers or green peppers (optional)
Tablespoons lemon juice or citric acid
Sugar (optional, to balance acidity)

How To Make Spaghetti Sauce From Tomato Sauce

Add your tomato puree or tomato sauce to a large pot and begin heating over medium heat. This is where the cooking process starts to build depth and flavor.

Allow the sauce cook to slowly reduce, stirring occasionally, until it thickens into a more concentrated base. This step is key for developing a thicker sauce and preventing a watery finished product.

Add tomato paste, onion powder, Italian seasoning, and black pepper. If you like a chunkier kind of sauce, you can add smaller pieces of bell peppers or green peppers. Fresh herbs like fresh basil can be added toward the end for the best flavor, while dried herbs hold up well during longer simmering.

Let the sauce continue simmering over medium high heat until it reduces by about half. If needed, add a little bit of sugar to balance acidity. This creates a perfect recipe for a hearty sauce that tastes like it simmered all day.

Can You Use Frozen Tomatoes?

Yes, frozen tomatoes work just as well as fresh tomatoes for this spaghetti sauce recipe.

After thawing to room temperature, the skins will slip off easily. You can run them through a food processor or food mill to create a smooth tomato puree.

Frozen tomatoes tend to release more liquid, so expect less time saved during prep but more time needed to reduce the sauce. Once reduced, the flavor is just as rich and works beautifully for tomato-based sauces.

How To Can Spaghetti Sauce (Water Bath Canning)

Prepare hot jars by washing them and keeping them warm until ready to fill.

Add acid directly to each jar before filling:
1 tablespoon lemon juice for pints
2 tablespoons lemon juice for quarts

Ladle hot spaghetti sauce into jars, leaving ½ inch headspace.

Use a butter knife to remove air bubbles, then wipe rims clean and apply lids and rings.

Place jars into a water bath canner, ensuring they are covered with hot water by at least 1 inch.

Once the hot water bath returns to a full boil:
Process pints for 35 minutes
Process quarts for 40 minutes

Adjust processing time based on altitude if needed.

When complete, remove jars with a jar lifter and allow them to rest undisturbed. After cooling, check that all jars are sealed.

Storage

Store sealed jars in a cool dark place for up to 12 months for best quality. Properly stored jars from last year are still safe if seals remain intact, but flavor is always best within the first year.

Canning Safety

This canning recipe follows safe home canning practices for acidified tomato products. Tomatoes can vary in acidity, which is why adding tablespoons lemon juice or citric acid is required.

Tomatoes are borderline low-acid foods, so proper acidification ensures they are safe for water bath canning. Never skip this step.

Always follow a tested recipe and refer to trusted sources like the national center or your local extension office if you have questions. A master food preserver or master gardeners group can also be a helpful resource, especially if this is your first time.

Common Mistakes To Avoid

Not reducing the sauce enough before canning
Skipping acid like lemon juice or citric acid
Overfilling jars or not removing air bubbles
Not following proper processing time
Confusing low acid foods with properly acidified recipes

Canned Spaghetti Sauce Recipe

The first step in making homemade spaghetti sauce is processing the fresh tomatoes into tomato sauce. Check out the fastest and easiest way to process tomatoes in this blog post.

Heat tomato puree on low-medium heat until it has reduced by about one-third. Add the spices and bring the sauce to a boil over medium heat, stirring frequently to avoid burning. Boil until the sauce has reduced by half of its original volume for a thicker sauce.

Add 1 Tbsp. (pint jar) or 2 Tbsp. (quart jars) bottled lemon juice to prepared jars before ladling in hot spaghetti sauce.

I recommend a canning ladle and funnel like these because they will last much longer than the plastic versions.

Leave ½ in headspace, remove air bubbles, and wipe the rim of the jar with a clean lint-free towel.

Center prepared lid on the jar and finger-tighten the screw band.

Place jars evenly in the rack and carefully lower the rack into the boiling water.

Ensure there is 1 inch or more of water above the jar lid.

Water Bath process for 35 minutes once the water returns to a roaring boil.

Remove the lid and turn off the heat when the processing time is complete. Lift the jar rack to the resting position and wait 5 minutes before removing jars with a jar lifter. Allow each jar to cool undisturbed. Check that each jar has been sealed after 24 hours.

Label jars and store them in a cool dark place for best quality use within 12 months.

Recipes Using Homemade Spaghetti Sauce:

This homemade pasta sauce also works as a quick marinara sauce, pizza sauce, or base for tomato-based casseroles and freezer meals.

• Fresh milled flour pasta
• Instant Pot Ravioli
• Baked pasta
• Homemade Pizza (fresh milled flour)
• Spaghetti squash
• Italian Meatballs

Canning Safety

This recipe follows the canning safety guidelines for Tomatoes Processed in a Boiling Water Canner as outlined in The Ball Complete Book of Home Preserving. If you are still unsure about using a canning recipe call your local extension office or visit The National Center For Home Food Preservation for guidance.

Following tested canning recipes and instructions is of the utmost importance to avoid unsafe canned food. Tomatoes don't always measure at 4.6 or lower on the pH scale, which is why we always add acid when we are canning tomato sauce and tomato products. Do not skip adding citric acid or lemon juice when canning spaghetti sauce and follow all home canning guidelines.

Mandatory Disclaimer: These recipes have been tested in my kitchen. They have not been tested for USDA approval, therefore, use them at your own risk. Hollishomestead.com is not responsible for unsafe canning practices or recipes used by the consumer. Please refer to the Ball Complete Book of Home Preserving for all canning safety, home canning formation as well as step-by-step instructions on how to get started with home preserving.

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Can I pressure can spaghetti sauce
Pressure canning is required if adding low acid foods like ground beef or italian sausage. This version is designed for water bath canning only.