Cabbage soup cannot be safely home canned under current USDA and National Center for Home Food Preservation (NCHFP) guidance. There is no tested process for plain cabbage or for cabbage in soup, so a pressure canner time, water-bath method, or blog recipe cannot be treated as an approved substitute. The practical options are to freeze the finished soup, or to pressure-can a tested vegetable soup without cabbage and add cooked cabbage when you open the jar.
That limit is not a minor quality note. Cabbage is a low-acid vegetable. In a sealed jar, Clostridium botulinum spores can survive ordinary boiling and produce toxin that cannot be seen, smelled, or tasted. Tested process times exist only for foods whose density and heat penetration have been measured. Cabbage has not cleared that bar.
Why cabbage is excluded from canned soup
The NCHFP soup procedure is not an open recipe. Every vegetable in the jar must already have its own USDA hot-pack canning recommendation. Cabbage does not. In a 2015 clarification, NCHFP specifically named cabbage (and cured meats such as ham) as ingredients it cannot recommend adding to canned soup for that reason.
Two problems sit behind that exclusion:
- Safety. Cabbage is denser and more rigid than greens such as spinach. NCHFP has said the process time for spinach and other greens would not necessarily destroy pathogens in cabbage, and that guessing a longer time is not acceptable for a low-acid food with a botulism risk. University Extension answers in 2024 and 2025 restated the same point: vegetable soup directions do not allow cabbage, and both quality and safety led researchers not to support home canning it.
- Quality. Even if heat penetration were solved, canned cabbage tends to discolor and develop a stronger, sometimes bitter flavor. Mid-century preservation research largely abandoned plain canned cabbage because the product was considered unpalatable. Fermented or pickled forms are the exception, because acidification changes the preservation method.
Filling the jar with extra broth does not fix this. The half-solids rule in the soup procedure was validated only for ingredients that already have individual canning recommendations. It was not tested as a way to make unapproved vegetables safe.
What a tested canned soup is allowed to contain
USDA and NCHFP allow a free-choice soup built only from ingredients that already have canning directions: selected vegetables prepared as for a hot pack, dried beans or peas that have been soaked and boiled, and pieces of meat, poultry, or seafood handled by their own canning methods. Broth, water, tomato juice, or tomatoes can cover the solids.
Do not add any of the following before processing:
- Cabbage, broccoli, cauliflower, celery, or summer squash
- Noodles, pasta, rice, flour, cornstarch, or other thickeners
- Milk, cream, cheese, or other dairy
- Pureed soup used as a thickener
- Cured meats such as ham or smoked sausage, which also lack a matching canning recommendation for this use
Pack hot. Fill jars only halfway with solids, then add boiling liquid to 1 inch of headspace. That 1:1 ratio is part of the safety process: heat moves through liquid faster than through a dense mass of vegetables, and the tested time assumes that circulation. Process only in a pressure canner, never a boiling-water canner and never an electric multi-cooker. NCHFP does not consider electric pressure cookers reliable for home canning because they may not hold the required temperature for the full process.
For the approved soup procedure (not for cabbage soup), NCHFP lists these times. If the soup contains seafood, use 100 minutes.
| Canner type | Jar size | Time | Pressure |
|---|---|---|---|
| Dial gauge | Pints | 60 min | 11 lb at 0–2,000 ft; 12 lb at 2,001–4,000 ft; 13 lb at 4,001–6,000 ft; 14 lb at 6,001–8,000 ft |
| Dial gauge | Quarts | 75 min | Same altitude pressures as pints |
| Weighted gauge | Pints | 60 min | 10 lb at 0–1,000 ft; 15 lb above 1,000 ft |
| Weighted gauge | Quarts | 75 min | Same altitude pressures as pints |
Those figures apply only when every solid is an allowed ingredient and the jar is packed half full of solids. They are not a tested time for cabbage soup.
Freezing cabbage soup
Freezing is the method Extension services recommend when a soup contains cabbage, smoked sausage, or other ingredients without a canning process. Cooked cabbage freezes well enough for later soup or stew, though the texture softens and it is no longer suitable for slaw.
Cool the soup quickly in shallow containers, then pack it in freezer-safe jars, boxes, or bags. Leave headspace so the liquid can expand. Smaller portions thaw more evenly and avoid the mushiness that comes from thawing and refreezing a large tub. Label with the date. Quality is best within a few months; many Extension guides treat about 2 to 6 months as the practical window for frozen soup, depending on packaging and freezer temperature.
Thaw in the refrigerator, under cold running water, or in the microwave, then reheat to a full boil. Frozen cabbage can darken or smell stronger than fresh, so taste a small batch of your recipe before you freeze a stockpot of it.
A shelf-stable workaround that stays inside the rules
If you want jars on the shelf and cabbage in the bowl, split the recipe.
Pressure-can a tested vegetable or vegetable-beef soup using only allowed ingredients and the NCHFP pack and process above. When you open a jar, cook shredded cabbage separately until just tender and stir it into the hot soup. Smoked sausage, noodles, rice, or a splash of cream belong at this stage too, not in the canner. The jar stays inside a tested process. The cabbage keeps a better texture and flavor because it never goes through a long pressure process.
This is the approach Michigan State University Extension has given readers who asked specifically about canning cabbage soup with tomato and smoked sausage.
Canning methods that do exist for cabbage
Cabbage is approved only when acid preserves it:
- Sauerkraut, fermented and then canned by the tested NCHFP process, with the salt level left as written
- Pickled relishes such as piccalilli, again from a tested recipe
Those products are sour and salty. They are not a substitute for a bowl of cabbage soup, and their processing times cannot be borrowed for soup.
Mistakes that show up in canning-cabbage-soup advice
Water-bath canning. Boiling water reaches 212°F (100°C). Botulinum spores in low-acid food need the higher temperature of a pressure canner, about 240°F (116°C). A long boil does not close that gap.
Untested blog times. Some homestead recipes pressure-can cabbage soup for 75 to 90 minutes and treat the missing USDA test as a paperwork gap. Extension specialists have said there is no research supporting that use, and that a higher liquid ratio has not been shown to solve the heat-penetration problem. Following an untested time is a personal risk decision, not a validated process.
Electric multi-cookers. Even when a machine has a “canning” button, USDA and NCHFP advise against using it for home canning. The issue is whether the jar interior stays at the required temperature for the full time, not whether the pot reaches pressure.
Thickened or overpacked jars. Flour, pasta, rice, or a jar packed mostly with cabbage slows heat. The soup procedure forbids those changes for that reason.
Assuming smell will warn you. Botulinum toxin does not reliably change odor, appearance, or taste. A jar that looks normal can still be unsafe if the process was never validated. If a home-canned low-acid food was not made by a current tested method, Extension guidance is not to taste it. Discard it where people and animals cannot eat it.
How to decide
Choose freezing when the soup you actually want includes cabbage, sausage, noodles, or cream. Choose pressure canning when you can build the jar from allowed vegetables and meat, then finish the bowl with cabbage after opening. Choose sauerkraut or relish only if a pickled product is what you want on the shelf.
Until a laboratory process for cabbage soup is published by USDA or NCHFP, there is no research-backed home-canning time for it. Freezing, or canning the base and adding cabbage at serving, is the route that matches current guidance.