How to Label Home-Canned Jars

Every home-canned jar should carry four things: what is in it, the date it was canned, a batch or lot number, and a best-by date for rotation. Put the label on the side of the jar rather than across the lid so the seal stays visible, and use a label that survives months on a shelf.

A jar with no label is a jar nobody eats. Six months on, an unlabeled quart of something red is a guessing game, and the safe answer to a guessing game is to throw it out. Labeling is the cheapest step in the whole process and the one that decides whether the food you put up actually gets used.

What belongs on a jar label

Four elements are essential and a few more are worth adding if the label has room. Keep the same order on every jar so you can read a shelf at a glance.

Where to put the label

Put it on the side of the jar and keep the lid clear. You check a seal by looking at the lid and pressing the center, so a label across the top gets in the way of the one check you repeat every time you take a jar off the shelf.

Avoid the screw band as well. Bands are commonly taken off for storage, and anything written on a band ends up on a different jar next season. The side of the glass is the only surface that stays with the contents from the canner to the table.

Choose a label that survives the shelf

The label has to get through condensation, a damp cellar, greasy hands, and being wiped down, without going illegible or welding itself to the glass. Three approaches cover most cases:

• Removable or washable labels. The most practical option for reusable jars. They come off in warm water at the end of the season instead of taking twenty minutes of scrubbing.
• Freezer-rated labels or tape. Worth the switch for anything going into the freezer, where standard adhesive lets go in the cold.
• Marker straight onto the glass. Fast and free with a paint pen or grease pencil, but you are limited to a couple of lines, and legibility drops when you are writing at speed at the end of a canning day.

Whatever you pick, write with something waterproof. A ballpoint on a damp label is unreadable by spring.

Canned-on and best-by are two different dates

Record both. The canned-on date is a fact about the jar; the best-by date is a planning target you choose so the shelf keeps moving. Many home canners plan around a roughly one-year window for best quality and check current USDA or National Center for Home Food Preservation guidance for the recommendation that applies to what they put up.

A best-by date is about quality and rotation, not a safety guarantee. A jar that has lost its seal, is leaking or bulging, or looks or smells wrong gets discarded without tasting, whatever the label says.

Labeling ferments, freezer, and dried goods

The same four elements apply, with one addition each. Ferments want the start date and the current day count, because that is the number you are actually tracking while the crock or jar is working. Freezer items want the freeze date written on freezer-rated material. Dried goods want the form noted, since dehydrated slices, powder, and leather from the same batch look nothing alike in a jar.

Printed labels beat handwritten ones

Printing solves the two problems handwriting cannot: legibility at the end of a long day, and fitting six fields into a space where you would otherwise squeeze in three. It also makes the shelf scannable, because every jar reads in the same order and the same size. The practical workflow is to log batches as you finish them and print the day's labels in one run once the jars have cooled and you know which ones sealed.

Doing this in Putby

Putby generates clean, printable and exportable jar labels with the contents, date, batch or lot, and best-by, drawn straight from the batch you logged, so the label and the record cannot drift apart. Labels are produced on your device and shared through your own share sheet, and the pantry inventory behind them tracks jar counts, canned-on and best-by dates, and an "Eat me first" rotation list. No account, no cloud, works offline.