Plan any canning batch — jars, lids, rings, and brine amounts — plus a processing time reference for water bath and pressure canning.
Times are for altitudes at or below 1,000 ft. Add time for higher elevations (see notes below). Always use USDA-tested recipes.
| Food | Jar Size | Method | Process Time | Pressure (lbs) |
|---|---|---|---|---|
| Tomatoes (crushed) | Pint | Water Bath | 35 min | — |
| Tomatoes (crushed) | Quart | Water Bath | 45 min | — |
| Tomatoes (whole) | Pint / Quart | Pressure | 10 min | 10 lbs |
| Green Beans | Pint | Pressure | 20 min | 10 lbs |
| Green Beans | Quart | Pressure | 25 min | 10 lbs |
| Salsa (USDA tested) | Pint | Water Bath | 15 min | — |
| Jam / Jelly | Half-Pint | Water Bath | 10 min | — |
| Dill Pickles | Quart | Water Bath | 15 min | — |
| Applesauce | Pint | Water Bath | 15 min | — |
| Applesauce | Quart | Water Bath | 20 min | — |
| Peaches (halved) | Pint | Water Bath | 20 min | — |
| Peaches (halved) | Quart | Water Bath | 25 min | — |
| Corn (whole kernel) | Pint | Pressure | 55 min | 10 lbs |
| Corn (whole kernel) | Quart | Pressure | 85 min | 10 lbs |
| Chicken (boneless) | Pint | Pressure | 75 min | 10 lbs |
| Ground Beef | Pint | Pressure | 75 min | 10 lbs |
Altitude adjustment: Add 5 min processing time for water bath canning at 1,001–3,000 ft; add 10 min at 3,001–6,000 ft. For pressure canning, increase to 15 lbs above 1,200 ft when using a weighted-gauge canner.
The single most important rule in home canning is this: high-acid foods can be water bath canned; low-acid foods must be pressure canned. Botulism toxin — produced by Clostridium botulinum spores — is destroyed at 240°F, a temperature only achievable in a pressure canner. A boiling water bath reaches only 212°F, which is insufficient to kill spores in low-acid environments. The consequences of getting this wrong can be fatal.
Water bath canning is safe for: fruits, jams, jellies, pickles (with adequate vinegar), tomatoes with added acid (lemon juice or citric acid), and salsa made from USDA-tested recipes.
Pressure canning is required for: all vegetables (green beans, corn, beets, carrots, potatoes), all meats and poultry, seafood, soups, stews, and any mixed recipe with low-acid ingredients.
Headspace is the empty space between the top of your food or liquid and the underside of the lid. Too little headspace and food expands during processing, preventing a proper seal. Too much and you trap excess air that can compromise the seal and accelerate quality loss. Standard headspace rules: jams and jellies use ¼ inch; fruits, tomatoes, and pickles use ½ inch; low-acid vegetables and meats use 1 inch. Always wipe jar rims with a clean damp cloth before applying lids — residue from food or brine breaks the seal.
Discard any jar where: the lid bulges up, makes a hollow sound when tapped (rather than a high ping), or is not concave in the center. Discard if you see spurting liquid when opening, any off smell, cloudiness in brine that was clear when packed, or any mold. When in doubt, throw it out — never taste-test to check for spoilage. Botulism toxin has no smell, taste, or visible sign in many cases.
For best quality, use home-canned foods within 12–18 months. The food remains safe indefinitely as long as the seal is intact, but flavor, texture, color, and nutritional value decline with time. Store canned goods in a cool (50–70°F), dark, dry location. Once opened, refrigerate and use within 3–5 days for most products. Jams and pickles last longer in the refrigerator after opening — 2–4 weeks is typical.
Home canning safety depends on tested pH levels, jar sizes, fill densities, and processing times. Altering the proportions of low-acid ingredients in a salsa or adding extra vegetables to a tested soup recipe changes the heat penetration time and may leave the center of dense jars under-processed. The USDA Complete Guide to Home Canning and the Ball Blue Book are the two authoritative sources. These recipes have been tested in laboratory conditions to ensure every part of every jar reaches safe temperatures during processing.
A standard 7-quart canner load of whole or crushed tomatoes requires approximately 21 pounds of fresh tomatoes. For pints, figure about 13–14 pounds for a 9-pint load. These amounts assume you've removed skins, cores, and bad spots — starting weight is always higher than finished yield.
Standard flat metal lids with sealing compound (Ball, Kerr, etc.) are designed for single use only. The sealing compound compresses once and will not reliably re-seal. Rings (bands) can be reused as long as they're not rusty, dented, or warped. Tattler reusable rubber-ring lids are an exception — they can be reused if inspected carefully between uses.
Modern tomato varieties have been selectively bred for lower acidity than older heirloom types, meaning their pH can sometimes be above the 4.6 threshold that makes water bath canning safe. Adding 2 tablespoons of bottled lemon juice per quart (1 tablespoon per pint) or ½ teaspoon of citric acid per quart ensures consistently safe acidity regardless of tomato variety or ripeness. Always use bottled lemon juice — fresh lemon juice has variable acidity.
Canning salt (also called pickling salt) is pure sodium chloride with no additives. Table salt contains anti-caking agents and sometimes iodine, both of which can turn pickle brine cloudy and may affect flavor. Use canning salt in any recipe that calls for it. Kosher salt without additives can substitute at a 1.25:1 ratio (slightly more by volume) because its larger crystals pack less densely.
A standard 21-quart water bath canner holds 7 quart jars or 9 pint jars per load. Smaller 12-quart canners hold 7 pint jars. A 16-quart pot with a rack can water bath 7 pints at minimum. For pressure canning, a 23-quart All-American or Presto holds 7 quart jars per load, or 19 pint jars in a double stack with a separator rack.