The Ultimate Guide to Canning Tomatoes for Beginners

Tomatoes are one of the easiest and most satisfying foods to can at home. Whether you’ve got an overflowing garden or scored a great deal at the farmers’ market, canning tomatoes helps you enjoy that summer flavor all year long.

This guide will walk you through everything you need to know from tools to step-by-step instructions so you can confidently can your own tomatoes, even if it’s your very first time.

What You’ll Need

Ingredients:

1. Fresh, ripe tomatoes (Roma or paste varieties work best)
2. Bottled lemon juice or citric acid
3. Salt (optional)

Equipment:

1. Large pot for boiling
2. Jar lifter or tongs
3. Canning funnel
4. Quart or pint-sized canning jars with lids and bands
5. Water bath canner (or a deep pot with a rack)
6. Large mixing bowl
7. Slotted spoon
8. Ladle

Step 1: Prepare the Tomatoes

Start by washing your tomatoes thoroughly under cold water. Remove any bruised or damaged spots.

To peel the skins easily:

1. Bring a pot of water to a boil.
2. Score a small “X” on the bottom of each tomato.
3. Drop tomatoes in boiling water for 30–60 seconds.
4. Transfer to a bowl of ice water.
5. Skins should slide off easily.
6. Cut out the core and chop or leave whole, depending on your canning method.

Step 2: Sterilize the Jars

Place clean jars in a pot of simmering water (not boiling) or run them through the dishwasher on a hot cycle. Boil the lids and bands separately for a few minutes and keep everything hot until ready to use.

Step 3: Add Acid

1. To safely can tomatoes, you must add acid to each jar.
2. Add one of the following to each pint jar:
3. 1 tablespoon bottled lemon juice
4. OR 1/4 teaspoon citric acid
5. For quart jars, double the amounts.
6. Optional: Add 1/2 teaspoon of salt per pint for flavor.

Step 4: Fill the Jars

Using a funnel, fill each hot jar with tomatoes, leaving about 1/2 inch of headspace at the top. Press down gently with a spoon to release air bubbles.

Top off with tomato juice or hot water if needed to maintain the 1/2-inch headspace.

Step 5: Seal and Process

1. Wipe the rims clean with a damp cloth.
2. Place lids on and screw bands until fingertip-tight.
3. Place jars in a water bath canner with water 1–2 inches above the jars.
4. Bring to a boil and process:
5. 40 minutes for pints
6. 45 minutes for quarts
7. Adjust for altitude if needed.

Step 6: Cool and Store

Carefully remove jars using a jar lifter and place them on a towel. Let them cool undisturbed for 12–24 hours. You’ll hear the lids “pop” as they seal.

Check seals by pressing down on the center of each lid. If it doesn’t pop back, it’s sealed. If it does, refrigerate and use within a few days.

Label jars with the date and store in a cool, dark place for up to a year.

Quick Tips for Beginners

1. Don’t skip the lemon juice—tomatoes need the extra acid for safe canning.
2. Always use clean, rust-free lids and jars.
3. Don’t reuse old lids for canning—use a fresh one each time.
4. Start with small batches to build confidence.
5. If you see mold or if the seal is broken, toss it—better safe than sorry.

Canning tomatoes may seem intimidating at first, but once you try it, you’ll see how simple and rewarding it really is. It’s a great way to reduce waste, stretch your harvest, and enjoy garden-fresh taste year-round.

Start with this guide, take your time, and before you know it, you’ll be stocking your pantry with jars of homemade goodness.