Canning Zucchini in Tomato Sauce, a great basic for your pantry. 

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You’ll need to weigh your produce before you start. The measurements are by weight not by volume. It is a specific ratio of zucchini to tomatoes.

  • For 7 quarts / you’ll need about 12 pounds of tomatoes and about 4 pounds of okra or zucchini.
  • For 9 pints / you’ll need about 7 pounds of tomatoes and 2-1/2 pounds of okra or zucchini.

If you just have a counter full of produce and want to keep canning until what you have is gone, keep to this ratio;  3 pounds tomatoes to 1 pound zucchini or okra.

During the harvest when the garden is producing…. I harvest what I’ve got and pile it all on the counter and start weighing what I’ve got and filling jars.  Weighing each batch as I go.

Know your Canner

Before you start this project, if you are not familiar with using a pressure canner I recommend reading – How to use a pressure canner.   This will familiarize you with how your canner works and what steps to take to get set up for any canning project.  

Canning Zucchini in Tomato Sauce Recipe 

Get all your canning supplies out.  (A full list can be found in the recipe card below.)

The goal is that when your zucchini tomato mixture is ready to go in the jars.  The jars and canner will be hot but not boiling.  Hot food, into hot jars, into hot canner.

Prepare the Tomatoes and Zucchini

The first step is to weigh your tomatoes and zucchini for one batch. Remember about 3 pounds tomatoes to 1 pound vegetable. 

Stainless steel bowl with whole tomatoes and fresh zucchini

After you’ve set aside what you’ll need, wash tomatoes and zucchini. Just give them a good rinse with cool water.  

Peel the tomatoes.  

Yes you really do need to peel them.  This is something people always want to skip. And some do… I don’t recommend it.

The way this recipe was tested is with peeled tomatoes.  If you keep the peels, you change up the recipe.  The easiest way to peel your tomatoes is to blanch the tomatoes in boiling water until the skins split then slip off the peels.  

Using a blancher or a large strainer basket, dip tomatoes in a pot of boiling water for about 30 – 60 seconds.  You will usually see the skins split but if not pull them out at 60 seconds and check them. 

The skins should just slip off the tomato with a little tug.  Sometimes if the tomato is a little green, the less ripe areas won’t peel as easily. If they seem a little stubborn you can use a knife to get the last bits of peel or or if needed dip another 30 seconds.  

Don’t boil longer than that or you’ll just end up cooking the tomatoes. Over cooked tomatoes isn’t the end of the world but it isn’t needed either.

I use a tomato corer to remove the stem but a knife works fine too.  Then slice the peeled tomatoes into a large pot.   Depending on the size of the tomato, quarters is usually fine, larger can be cut into more pieces. If you’ve got smaller tomatoes you can just slice in half.

Preparing the Zucchini or Okra

If you are using zucchini, cut into bite size cubes. You can peel them if you like but it is not required for this recipe.  Peels on or off is fine.

If you are using okra, cut off the stems and slice into 1 inch pieces.  (You can leave them whole if desired.) 

Combine Tomatoes and Zucchini 

Pot with mixture of zucchini and tomatoes ready to be cooked.
Mixing tomatoes and zucchini together.

The tomatoes need to be simmered first. Then the zucchini needs to be added cooked long enough to be hot throughout.  

  • Bring tomatoes to a boil and simmer for 10 minutes.
  • Then add zucchini (or okra) and boil gently 5 minutes.

Processing in a Pressure Canner

Now that you’ve got your zucchini tomato mixture ready, it is time to fill jars!  Your canner and jars should be hot but not boiling.

Filling Canning Jars

Add salt to your jars, 1 teaspoon per quart, 1/2 teaspoon per pint.  Although salt is optional, it really adds to the flavor so I do recommend adding salt.  But if you need to lower sodium it can be reduced or left out.  

Optional…. You can add a bit of onion if you like.  NCFHFP says 4-5 pearl onions or 3 slices per jar.  I didn’t do this but I’ll likely add this next time.  I think the onion would add a lot of good flavor.   

Fill a jar with tomato zucchini mixture.  Leave 1 inch headspace.  Headspace is the space between the jar lid and the food.  It is important to the canning process.  Air is expelled from the jar as the food swells as it is heated.  You want that expansion space.  

Remove air bubbles with a bubble tool.   Any small plastic utensil works.  I’ve often used an orange peeler.  A plastic picnic knife would work too.  Just put it down in the jar, slide it around the edge and move things around. Any trapped air bubbles will rise to the surface.  

Check your headspace again.  Sometimes the air bubble step will change the level of the food.  Add more if needed.

Wipe rims of jar clean with damp towel or paper towel.  This is important because any residue on the rim might interfere with the seal. 

Add your canning lids and rings, finger tight. That simply means you don’t have to crank down hard. Just close it like you are closing a jar to put it in the fridge. I’ve got a video on just what finger tight means here.

Pressure Canning

Place jars in the hot (not boiling yet) canner.  When all jars are filled, process according to the instruction and chart in the recipe card below.  Be sure and check the right chart for your canner style, and for your altitude. 

Frequently Asked Questions

Can I add spices to zucchini tomato sauce?

Yes, Home canning recipes can be adapted with spices to add more flavor. Keep in mind this should be dried spices. Do not add fresh. Dried oregano or basil might be good additions!

Can I add peppers or garlic to this?

No, in this case this recipe is specifically for zucchini or okra. Do not add peppers, celery or any other vegetables. I do have a stewed tomato recipe that might serve better if you want those other vegetables.
Stewed Tomatoes

How do you use zucchini tomatoes?

This can just be heated up and eaten as a side dish just as it is. Or add a few ingredients and it makes a meal. The taste is fresh and delicious.

It makes a great base for many recipes. Soups, stews, casseroles, anything that has a tomato and vegetable base to it.

Add some garlic, and spices like parsley, oregano, or basil, pour it over pasta and top with parmesan cheese. Add some red pepper flakes if you like a bit of spice.

Can I use a water bath canner for this recipe if I add lemon juice?

No, this recipe has been tested for a pressure canner only. Adding lemon juice doesn’t change that.

Recipe Card 

Canning Zucchini in Tomato Sauce (Okra Too!)

Canning zucchini in tomato sauce is a great way to preserve the summer harvest. Learn how to can zucchini (or okra) to a tomato-based sauce. 
Print Recipe
Three finished pint jars of zucchini in tomato sauce sitting on a deck railing.
Prep Time:1 hour 15 minutes
Processing Quarts (adjust for altitude):35 minutes
Total Time:1 hour 50 minutes


  • 12 pounds Tomatoes approximate amount
  • 4 pounds Zucchini or okra, approximate amount
  • Canning Salt
  • Zucchini or okra, optional – 2 slices per jar


Tomato Zucchini 

  • First step is to measure your tomatoes and zucchini.  Remember about 3 pounds tomatoes to 1 pound vegetable. 
  • Wash your produce. Just give them a good rinse.
  • Peel tomatoes by blanching in boiling water until skins split, then slip off peels.  Remove stem and slice tomatoes in quarters.
  • If using Okra, cut off stems and slice into 1 inch pieces.  (You can leave them whole if desired.) 
  • If using zucchini cut into bite size cubes. Peel if desired.  

Combine tomatoes and vegetables. 

  • Bring tomatoes only to a boil and simmer 10 minutes. 
  • Then add zucchini (or okra) and boil gently 5 minutes. 

Packing the Jars

  • Add salt to your jars, 1 teaspoon per quart, 1/2 teaspoon per pint. 
  • Fill jar with tomato zucchini mix.  Leave 1 inch headspace. 
  • Remove air bubbles and check your headspace again.  Adjust if needed.
  • Wipe rims of jar clean with damp towel or paper towel. 
  • Add your canning lids and rings, finger tight. 
  • Place jar in the canner.  When all jars are filled, process according to the instruction and chart in the notes area below. 

Processing with a Pressure Canner

  • Put the lid on the canner leaving the weights off.  Bring to a boil. Watch for  steam to start coming out the vent pipe in the lid.
  • Allow the steam to ‘vent’ for 10 minutes then put the weights on. Use the proper weight for your altitude (check the chart) This is when pressure will start to build. 
  • When the pressure reaches your requirements, start your time.  Process for the full time indicated, adjusting the heat as needed to maintain the correct pressure for the entire time.
  • When processing time is completed turn off the heat. Do not remove weights yet. Let the canner sit undisturbed until pressure comes back to zero. Do not try to speed up the cooling process.
  • Remove the weight and wait 5 minutes.
  • Open the lid to allow steam to escape. (carefully don’t let it hit your face or arms!) Leave the lid setting on top of the canner slightly ajar and wait 5 minutes again. 
  • Take the lid off the canner and remove your jars. (optionally you can wait another 5 minutes if the contents appear to be bubbling so hard it is coming out of the jars).
  • Put the jars a few inches apart on a thick towel and allow them to cool to room temperature undisturbed. 12 hours is suggested.
  • When the jars are cool, remove the metal bands, check the seals, wash jars, dry completely, and store in a cool dark place.


Optional –  You may add four or five pearl onions or two onion slices to each jar.
Pressure canning instruction.  Pay attention to the proper time for the proper equipment.  
Processing in a Pressure Canner.  
Pints are processed for 30 minutes 
Quarts are processed for 35 minutes.
Step one – use the chart for the style of pressure canner you are using.  
Step two – check the altitude adjustments for your altitude.
Dial Gauge – Watch the dial on your canner to determine pressure.
Altitude  Weight (pounds pressure)
0-2000 11 lbs
2001-4,000 12 lbs 
4,001-6,000 13 lbs
6,001-8,000 14lbs
Weighted Gauge – Watch for the weight to ‘jiggle’ to determine pressure.
Altitude Weight (pounds pressure)
0-1000 ft 10 lbs 
Above 1000 15 pounds
Servings: 7 quart jars
Pint jars of zucchini lined up on a deck railing in the sun.

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