To can tomato soup, use a tested recipe: fill hot jars with 1-inch headspace and pressure-process for the stated time; add dairy or thickeners only when serving.
Here’s the straight path to pantry-ready tomato soup that stays safe on the shelf. You’ll prep a simple tomato base, pack it hot, keep the texture thin for canning, and run a full pressure-canner cycle based on jar size and altitude. Cream, flour, pasta, and other thickeners wait until you open the jar later. The steps and times below come from research-based guidance so you can work with confidence.
How Do You Can Tomato Soup? Step-By-Step Overview
Start with ripe tomatoes, clear your work area, and warm your jars. Simmer a smooth tomato base, season lightly, and keep solids in balance with liquid. Load hot jars, leave 1-inch headspace, remove bubbles, and wipe rims. Fit lids and process in a pressure canner for the exact time and pressure your setup calls for. Cool the jars undisturbed, check seals the next day, and label for storage.
| Step | What To Do | Why It Matters |
|---|---|---|
| 1) Prep Tomatoes | Wash, core, and blanch to slip skins; crush or puree as preferred. | Clean produce and uniform pieces improve heating. |
| 2) Cook Base | Simmer tomatoes with onion, garlic, herbs; keep mixture thin. | Thin liquid heats evenly; thick mixes can be unsafe. |
| 3) Season Lightly | Use salt and dried herbs; skip cream, flour, and pasta. | Dairy and thickeners are not safe for canning. |
| 4) Heat Jars | Keep clean jars hot; prepare new lids per maker’s directions. | Reduces breakage and helps sealing. |
| 5) Fill Hot | Ladle soup into jars, leave 1-inch headspace; de-bubble. | Correct headspace prevents siphoning and seal issues. |
| 6) Wipe & Lid | Wipe rims with vinegar-damp cloth; center lids, add rings fingertip-tight. | Clean rims support a strong seal. |
| 7) Process | Set jars on rack in pressure canner; vent 10 minutes; process at proper pressure/time. | Full vent and correct pressure drive heat through the jar. |
| 8) Cool & Check | Let pressure return to zero naturally; rest 5 minutes; remove jars; cool 12–24 hours. | Prevents liquid loss and shock; sealing happens during cool-down. |
Tested Soup Rules That Keep You Safe
Tomato soup is a mixed dish. That means it gets processed as a low-acid soup, which calls for a pressure canner. The science-based soup directions also say not to add noodles, rice, flour, cream, or milk to jars. Those items change heat flow and storage stability. If you want a creamy bowl later, add dairy after you open the jar and reheat it on the stove. The same goes for roux-style thickeners—stir them in right before serving.
Tomatoes ride the line on acidity, so tomato products often include acidification. When you’re canning tomato-only products like juice or sauce, tested methods add bottled lemon juice or citric acid to each jar. For soup, follow the tested soup directions and keep the texture thin. If you choose a tomato-forward “plain” soup base, you can still add the standard acid amounts many tomato recipes use; it brightens flavor and supports safe processing. See the official directions on canning soups and the page on acidifying tomatoes.
Gear You’ll Need
- Pressure canner with rack (dial-gauge or weighted-gauge)
- Pint or quart canning jars with new two-piece lids
- Jar lifter, bubble remover, headspace tool, wide-mouth funnel
- Large nonreactive pot, ladle, clean towels, and vinegar for wiping rims
Ingredients That Work Well
- Fresh tomatoes (paste types give body; slicing types add juice)
- Onion and garlic, sautéed in a little oil then simmered into the base
- Dried basil or oregano; black pepper; a pinch of sugar if the tomatoes taste sharp
- Salt to taste (non-iodized canning salt gives the cleanest flavor)
Ingredients To Leave Out Of The Jar
- Cream, milk, half-and-half, or cheese
- Flour, cornstarch, arrowroot, or other thickeners
- Pasta, rice, dumplings, or quinoa
- Butter-and-flour roux bases
Why Acid Shows Up In Tomato Directions
Modern tomatoes vary in pH by variety, growing conditions, and ripeness. The standard fix for tomato-only products is to add bottled lemon juice or food-grade citric acid to each jar. The usual rates: 2 tablespoons bottled lemon juice or 1/2 teaspoon citric acid per quart (half those amounts for pints). Vinegar at 5% acidity is another option, though the flavor is sharper. If you acidify a tomato-heavy soup base, keep the amounts consistent across jars. These rates are outlined on the official tomato canning page linked above.
Processing Times And Pressures For Tomato Soup
Here’s the research-based processing schedule for plain vegetable/meat soups in a pressure canner, which also covers thin tomato soup bases. Keep the mixture thin, pack solids only halfway, and top with liquid. Always vent the canner for 10 minutes before you build pressure.
| Gauge Type & Jar | Process Time | Pressure By Elevation |
|---|---|---|
| Dial-Gauge, Pints | 60 minutes | 0–2,000 ft: 11 psi; 2,001–4,000 ft: 12 psi; 4,001–6,000 ft: 13 psi; 6,001–8,000 ft: 14 psi |
| Dial-Gauge, Quarts | 75 minutes | Same pressures as above by elevation |
| Weighted-Gauge, Pints | 60 minutes | 0–1,000 ft: 10 lb; Above 1,000 ft: 15 lb |
| Weighted-Gauge, Quarts | 75 minutes | 0–1,000 ft: 10 lb; Above 1,000 ft: 15 lb |
| Any Soup With Seafood | 100 minutes | Follow the same gauge and altitude rules |
| Boiling-Water Canner | Not for mixed soups | Use only for tomato-only products with acidification |
Altitude Adjustments In Plain Terms
At higher elevations water boils at a lower temperature, so you increase pressure (or time where a method says so) to keep heat high enough. Pick the line for your jar size and gauge, then match your altitude. If you use a weighted-gauge canner and live above 1,000 feet, run 15 lb weight for the full time. If you’re using a dial-gauge canner, set the exact psi for your elevation band.
Detailed Method: How Do You Can Tomato Soup? Now By The Clock
1) Make The Base
Bring a large pot of tomatoes to a simmer with onion and garlic. Purée for smooth soup or crush for a rustic style. Keep liquid in balance so the mixture pours easily. If the tomatoes taste sharp, add a pinch of sugar. Salt lightly; flavors concentrate during storage.
2) Ready The Canner
Set the rack in the pressure canner. Add the amount of water your canner manual calls for. Place the lid nearby; leave it off for now. Warm clean jars so hot soup won’t shock them.
3) Pack The Jars
Using a funnel, fill jars to 1-inch headspace. If solids are chunky, fill jars no more than halfway with solids, then top with liquid. Slide a bubble remover along the sides of the jar. Check headspace again and adjust if needed.
4) Lid And Load
Wipe rims with a vinegar-damp cloth. Center lids and add bands just until they stop, then a slight snug turn. Load jars on the rack, spacing them evenly.
5) Vent, Pressurize, Process
Lock the lid. Bring the canner to a strong vent of steam and vent 10 minutes. Add the weight or close the petcock. When you reach target pressure, start the timer. Keep pressure steady for the full time.
6) Cool Down Correctly
Turn off the heat and let pressure return to zero on its own. Wait 5 minutes, open the lid away from you, and lift out jars with the lifter. Set them on a towel with space between each one. Don’t retighten bands or tilt the jars.
7) Next-Day Checks
After 12–24 hours, remove bands and test seals by lifting lids gently with fingertips. A good seal holds. Wash jars, label with the contents and date, and store in a cool, dark place. For the best flavor, use within a year.
Flavor Moves That Still Keep Jars Safe
Want a silky bowl later? Blend in a splash of cream or a spoon of pesto when you open the jar. Prefer a thicker body? Whisk a small cornstarch slurry into the reheated soup right before serving. Croutons, grilled cheese, or cooked pasta can go straight into the bowl for texture without touching the canning step.
Common Pitfalls And Easy Fixes
Jars Lost Liquid During Processing
That’s siphoning. Causes include skipping the 10-minute vent, dropping pressure, or yanking jars too soon. Keep a steady gauge, wait for full cool-down, and rest jars 5 minutes in the canner before lifting them out.
Texture Came Out Too Thick
Add broth or tomato juice to thin before canning. Save thick finishes for serving day. Thick soup can trap heat and lead to unsafe jars.
A Jar Didn’t Seal
Refrigerate and eat within a few days, or re-process within 24 hours with a new lid and fresh headspace. If multiple jars didn’t seal, check your headspace, rim cleaning, and ring tightness.
Metallic Taste Or Dark Color
Acidic tomato soup in reactive pots can pick up off-notes. Use stainless steel or enamel. Keep storage out of light to protect color.
Storage, Shelf Life, And Reheating
Store sealed jars in a cool, dark place, ideally 10–21 °C. Skip garages that swing hot and cold. For the best quality, enjoy within 12 months. When opening, listen for the seal pop, check aroma, and scan the surface. If anything looks or smells off, discard the contents without tasting. Reheat the soup to a gentle boil, then stir in cream or thickeners off the heat.
Where This Method Comes From
The processing times and safety notes here follow the science-based soup directions from the National Center for Home Food Preservation. Their page lays out the no-thickener rule, headspace, venting, and exact pressure schedules. Tomato acid guidance also comes from their tomato products section. Those sources are the public reference many Extension services point to, and they’re kept current on process times and rules.
Keyword Variant: Canning Tomato Soup Rules And Times
Searchers often ask the same core question in different words: canning tomato soup times, pressure vs. water-bath, headspace, and altitude. The short version: thin soup base only, 1-inch headspace, full 10-minute vent, then 60 minutes for pints or 75 minutes for quarts at the proper pressure. Add cream or thickeners after opening. The phrase “how do you can tomato soup?” shows up a lot, and the answer stays the same—follow tested steps and you’ll be set.
Your Make-Ahead Plan For Busy Nights
Build a base day, a canning day, and a serving day. On base day, cook a big batch of tomato soup base and chill it overnight. On canning day, bring it back to a boil and run the pressure canner. On serving day, open a jar, reheat, and finish it your way—cream, a pat of butter, or a swirl of pesto. That rhythm keeps the canning step smooth and gives you quick dinners on the shelf.
If you came here wondering, “how do you can tomato soup?” you now have a clear plan that tracks real safety standards, keeps the flavor bright, and leaves plenty of room for your own finish at the table.
