What to Can, How to Can, and What to Freeze

Knowing what to can, how to can it safely, and what to freeze can make seasonal food preservation easier and less wasteful. Use this practical guide as a printable planning checklist for choosing produce, selecting the right preservation method, preparing food, and storing finished batches. Always follow current, tested instructions for time, temperature, acidity, and processing method.

What to Can

Canning works especially well for fruits, tomatoes, pickles, relishes, jams, jellies, and other foods prepared with enough acid. High-acid foods can usually be processed in a boiling-water canner, while low-acid vegetables, meats, poultry, seafood, and many mixed recipes require a pressure canner. The correct method is important because sealed jars are not automatically safe simply because they look clean or remain unopened.

Good candidates for canning include applesauce, peaches, pears, berries, tomatoes prepared according to a tested recipe, green beans, pickled cucumbers, salsa, and fruit preserves. Combining ingredients can change a recipe’s acidity and density, so avoid making untested substitutions or changing the proportions of vegetables, meat, liquid, or vinegar. For additional planning ideas, see this guide to canned food shelf life and storage safety.

How to Can Food Safely

1. Choose a tested recipe. Use instructions from a trusted food-preservation source and follow the listed ingredients, jar size, processing time, and method.
2. Inspect your equipment. Check jars for cracks, use new flat lids, and make sure rings, racks, and the canner are in good condition.
3. Prepare the food carefully. Wash produce, remove damaged portions, and cut ingredients as directed. Keep prepared food and jars at the recommended temperature.
4. Fill jars correctly. Leave the specified headspace so food can expand and a proper vacuum can form. Remove trapped air bubbles and wipe the rim before applying the lid.
5. Process for the full time. Start timing only when the canner reaches the required conditions. Adjust for altitude when the recipe calls for it.
6. Cool and check the jars. Let jars cool undisturbed, then check that each lid has sealed. Refrigerate or reprocess jars that do not seal according to current safety guidance.

Boiling-water canning is designed for acidified foods, such as properly prepared fruit, pickles, and many tomato recipes. Pressure canning reaches a higher temperature and is necessary for most low-acid foods. Do not use a boiling-water canner as a substitute for a pressure canner when a tested recipe specifies pressure processing. For another preservation reference, review this food-canning guide and preservation resource.

What to Freeze

Freezing is often the easiest option for foods that do not can well or that you want to use in small portions. Berries, sliced fruit, vegetables, herbs, cooked beans, bread, soups, casseroles, and many prepared meals can retain good quality when packaged properly. Freezing does not improve food quality, so begin with fresh, sound ingredients and freeze them promptly.

Many vegetables benefit from blanching before freezing. Briefly heating vegetables in boiling water or steam helps slow quality loss, then cooling them quickly in ice water stops the cooking process. Drain thoroughly before packing. Corn, green beans, broccoli, carrots, peas, and leafy greens commonly benefit from this preparation. Some foods, including onions, peppers, herbs, and many fruits, may be frozen without blanching, although the best method depends on how you plan to use them.

Freezing and Storage Tips

• Package food in moisture-resistant freezer bags or containers and remove as much air as practical.
• Label each package with the food name and freezing date so older items are used first.
• Freeze food in usable portions instead of one large block.
• Leave room for expansion when freezing liquids such as soup, stock, or fruit puree.
• Spread warm packages out in the freezer so they cool quickly, then organize them after they are solid.
• Keep the freezer at 0°F (-18°C) or colder for long-term storage and maintain a consistent temperature.

Printable Food Preservation Checklist

Use this condensed list when planning a preservation session:

• Choose fresh produce and decide whether canning or freezing will give the best result.
• Gather jars, lids, freezer containers, labels, measuring tools, and the required canner.
• Find a tested recipe and check its processing method, headspace, time, and altitude adjustments.
• Wash and prepare ingredients according to the recipe rather than making casual substitutions.
• For canning, process jars for the complete time and inspect seals after cooling.
• For freezing, blanch vegetables when recommended, cool food, package it tightly, and label every container.
• Store finished food in a cool, dry, dark place for canned goods or in a consistently cold freezer for frozen foods.

Choosing the Best Method

Choose canning when you want shelf-stable jars and have a tested recipe with the right equipment. Choose freezing when you want to preserve texture-sensitive foods, cooked meals, or ingredients for short-term convenience. Some foods can be preserved either way, so consider available storage space, preparation time, desired texture, and how the food will be used. A simple plan can help you preserve more of the harvest while keeping each batch safe, practical, and easy to identify.