How to Make Sauerkraut in Quart Jars

Sauerkraut is cabbage fermented with salt until it turns tangy and pleasantly crisp; it is commonly served as a side, topping, or ingredient in Central and Eastern European cooking. Making it in quart jars requires only cabbage, non-iodized salt, clean jars, and time at a cool room temperature. Use a kitchen scale for the most reliable salt ratio, and keep the cabbage submerged throughout fermentation.

What You’ll Need

1 medium green cabbage, about 2 lb (900 g), yielding roughly 1½ lb (680 g) trimmed cabbage
Salt equal to 2% of the trimmed cabbage’s weight: 14 g salt for 680 g cabbage, about 2¼ teaspoons fine salt (volume varies by salt type). Use non-iodized pickling or fine sea salt.
One clean, wide-mouth quart jar (32 fl oz / 946 ml), plus a second jar if needed for the cabbage
A kitchen scale, knife, cutting board, and large bowl
A fermentation weight or a small, clean food-safe glass weight that fits inside the jar
A loose-fitting lid or fermentation lid with an airlock; a small plate or tray to catch overflow

Step-by-Step

Clean and prepare. Wash your hands, work surface, knife, bowl, jar, and weight with hot soapy water, then rinse well. Clean equipment helps avoid unwanted contamination, but fermentation does not require sterile canning equipment. Remove any damaged outer cabbage leaves and set aside one clean, intact leaf if you want to use it as a cover.
Weigh the cabbage. Quarter the cabbage, cut out the core, and finely shred it into a bowl. Weigh the shredded cabbage; use salt equal to 2% of its weight. For example, 680 g cabbage needs 14 g salt. This weight-based ratio is more dependable than measuring salt by spoon, since crystal size and density differ.
Salt and massage. Sprinkle the salt evenly over the cabbage. Massage and squeeze it firmly for about 5–10 minutes, then leave it for 15 minutes. The cabbage should soften and release enough liquid to form a brine. If it still seems dry, massage it a little longer before adding anything; do not rinse it.
Pack the jar. Transfer the cabbage to the quart jar in small handfuls, pressing each layer down firmly to remove air pockets. Pour in all the liquid from the bowl. Leave about 1–2 inches (2.5–5 cm) of headspace for bubbling. The cabbage must sit below its brine. If one quart jar will not hold it with enough headspace, divide the batch between two clean jars.
Keep it submerged. Place the fermentation weight on top of the cabbage. If needed, tuck the reserved cabbage leaf beneath the weight to keep shreds from floating. If the brine does not cover the cabbage after packing, wait another 30–60 minutes and press again. If it remains short, top up with a little 2% brine—20 g salt dissolved in 1 liter water (about 4 teaspoons salt in 4¼ cups water, depending on salt)—rather than plain water.
Cover and ferment. Fit a fermentation lid or set a regular lid on loosely so gas can escape. Place the jar on a tray away from direct sunlight, ideally at 65–72°F (18–22°C). Ferment for about 1–3 weeks, checking daily at first that the cabbage stays beneath the brine. With an ordinary screw lid, do not tighten it firmly; carefully loosen it once a day to release built-up gas, then close it loosely again.
Check for readiness and refrigerate. After about a week, taste a clean sample. Continue fermenting until the cabbage is pleasantly sour and the texture suits you; cooler rooms take longer, while warmer rooms ferment faster. When ready, remove the weight, make sure the cabbage is covered by brine, seal the jar, and refrigerate at 40°F (4°C) or colder. Keep it refrigerated; this method is not shelf-stable canning.

Common Mistakes

Using too little or too much salt: Too little can make fermentation less dependable and the cabbage softer; too much can slow fermentation and taste harsh. Weigh the cabbage and calculate salt at 2%.
Letting cabbage sit above the brine: Exposed shreds are more likely to dry out or develop surface growth. Pack firmly, use a weight, and check the liquid level.
Filling the jar to the rim: Active fermentation produces gas and can push brine out. Leave headspace and set the jar on a tray.
Closing a standard lid tightly: Gas pressure can build. Use an airlock or keep a regular lid loose and release gas daily.
Expecting a fixed finish date: Temperature affects fermentation speed. Taste and judge the cabbage rather than relying on a calendar alone.

Tips

Use fresh, firm cabbage; older or wilted cabbage may release less liquid and finish softer.
Weigh salt in grams when possible. If using a spoon, remember that coarse kosher salts vary substantially in volume; do not assume every brand measures like fine salt.
Keep the jar out of direct sun and away from a stove or other heat source. A stable, cool room temperature encourages a steadier ferment.
During the first few days, bubbling, cloudy brine, and a clean sour smell are normal. Wipe overflow from the tray and jar promptly.
For flavor, you can mix in a small amount of caraway seed or thinly sliced onion. Keep the cabbage-to-salt ratio unchanged, and ensure any additions stay under the brine.
Use a clean utensil to take servings, then return the jar promptly to the refrigerator. Refrigeration slows fermentation but does not stop it completely.

Troubleshooting

There is not enough brine. Press the cabbage firmly and wait; salt draws out liquid over time. If it is still not submerged, add only enough 2% brine to cover it. Do not add plain water, which dilutes the salt concentration.

The brine is bubbling or cloudy. These are common signs of active fermentation. Keep the cabbage weighted below the liquid, clean up overflow, and let the process continue.

A thin white film appears on top. A flat, pale film can be surface yeast. Remove it and any cabbage that was exposed, clean the jar rim, and confirm the remaining cabbage is submerged. If you are uncertain what the growth is, discard the batch rather than tasting it.

You see fuzzy mold or unusual colors. Discard the entire batch if growth is fuzzy, or if you see pink, orange, or black discoloration, or notice a rotten, putrid, or otherwise foul odor. Do not scrape off mold and eat the cabbage underneath. When in doubt, throw it out.

The cabbage is still mild or too crunchy. It may need more time, especially in a cool room. Keep it submerged and continue fermenting, tasting periodically with a clean utensil. If it becomes sour enough, refrigerate it to slow further change.

The cabbage is soft. Warm conditions, insufficient salt, or cabbage that was not fresh can contribute. A soft batch with no signs of spoilage may be safe but will have a less appealing texture; refrigerate it if the flavor is acceptable. Discard it if there are spoilage signs.

Frequently Asked Questions

How much salt do I need for a quart jar?
Measure the trimmed cabbage, not the jar capacity. Use 2% of its weight: 14 g salt for 680 g cabbage. A quart jar may hold more or less cabbage depending on how finely it is shredded and packed.

Can I make sauerkraut without a fermentation weight?
Yes, if you can keep the cabbage below the brine. A clean, small food-safe glass weight that fits the jar can work. Check often and remove floating shreds; never use a stone or other object that may be dirty or unsuitable for food.

How long should sauerkraut ferment?
Often 1–3 weeks at 65–72°F (18–22°C), but temperature and personal taste matter. Begin tasting after about a week and refrigerate when it is as tangy as you like.

Does the jar need to be airtight?
No. Fermentation releases gas, so use an airlock or leave a regular lid loose enough for gas to escape. A tightly sealed ordinary jar can build pressure.

How long does homemade sauerkraut keep?
Store it continuously refrigerated at 40°F (4°C) or colder, with the cabbage under brine, and use a clean utensil. For best quality, aim to use it within about 3 months; discard it if you notice mold, unusual color, or a foul odor.

Can I store this jar at room temperature after it is fermented?
No. This is a refrigerator-fermentation method, not a tested canning recipe. Keep the finished sauerkraut refrigerated or freeze it; do not treat a sealed jar as shelf-stable.

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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes

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