A summer glut of tomatoes can be lovely until every windowsill is full of ripening fruit and nobody wants another salad. Freezing is one of the simplest ways to preserve their flavour for cooked dishes. There's no need for a pressure canner or jars, although the finished texture will be much softer than fresh tomatoes.
The important distinction is freezing versus bottling or canning. Freezing sound tomatoes in a working freezer is a straightforward household process. Home canning tomatoes requires tested acidification and processing procedures; you should not apply the casual freezing method to jars stored on a shelf.
Choose ripe, sound tomatoes
Select fruit with good colour and flavour, free from mould, extensive bruising or wet decay. A firm ripe plum tomato makes a useful sauce base, while cherry tomatoes can be frozen whole.
An overripe tomato may be soft but still usable if wholesome. However, don't preserve fruit already fermenting, leaking badly or showing spoilage.
Wash your hands and prepare clean equipment. Freezing slows deterioration but does not make contaminated or rotten tomatoes safe.
Decide how you'll use them later
Whole tomatoes are convenient for stews and cooked sauces. Chopped tomatoes fit a soup or casserole without much additional preparation. Cooked tomato purée or sauce takes more work now but saves time on a busy winter evening.
Don't expect thawed tomatoes to look attractive in a fresh salad. Ice crystals damage their cell structure and the flesh becomes soft and watery.
Choose the form that suits the meals you actually cook. A freezer full of whole large tomatoes isn't very useful if you only ever need two tablespoons of sauce at a time.
Wash and dry the fruit
Rinse tomatoes under cool running water, rubbing gently to remove dirt. Remove any leaves or loose stalk parts.
Dry the fruit with clean kitchen paper or a suitable towel. Excess water isn't usually a safety issue for freezing, but it can create heavy ice around the pieces.
Inspect closely around the stem ends, where cracks or damage may be hidden. Trim away the hard core if you are preparing chopped tomatoes.
Freezing whole tomatoes
The National Center for Home Food Preservation includes a method for freezing raw tomatoes with or without their skins.
After washing, cut away the stem scars and cores as directed. Pack the tomatoes into suitable freezer containers, leaving the appropriate space for the type of pack and container.
For a convenient home variation, tray-freeze small dry tomatoes until firm before moving them into freezer-rated bags. Label with the date and keep them frozen until needed.
Why some people peel tomatoes first
Tomato skin becomes noticeable in a smooth sauce after cooking. If you plan to make purée, removing the skin before freezing may save work later.
You can loosen skins by briefly dipping tomatoes in boiling water, cooling promptly and slipping the skins off. Follow a tested preservation method for the appropriate timing.
Whole frozen tomatoes can also be easier to peel after a short thaw, because the skins often loosen. Be mindful that the flesh quickly becomes soft and releases liquid.
Freezing chopped tomatoes
Core washed sound tomatoes and cut them into pieces of a useful size. Work on a clean chopping board and collect the juices in a bowl.
Divide the pieces into freezer-safe containers or bags, avoiding excessive air exposure. Flatten small portions if using bags so they freeze more quickly and stack neatly.
Label the approximate quantity. A 400g portion can be convenient for recipes that normally call for a tin of chopped tomatoes, although its water content and flavour may differ.
Freezing tomato purée
Cook prepared tomatoes gently until softened, then pass them through a sieve or food mill if you want a smooth consistency without skins and seeds.
Reduce to the thickness you prefer, stirring to prevent sticking. Cool promptly using safe food-handling practices before packing into freezer containers.
Leave room for expansion when freezing a liquid or thick purée in a rigid container. A jar filled to the brim may crack as the contents freeze, and not every glass jar is freezer rated.
Freezing a prepared tomato sauce
You can make a simple sauce with tomatoes, olive oil, onion and herbs, then portion it for pasta or pizza.
Cook ingredients appropriately, cool the finished sauce promptly and package in meal-sized freezer portions. Label additions such as cheese, cream or meat because they change both storage considerations and dietary suitability.
If the sauce contains meat, follow applicable safety guidance for cooked meals. Don't assume instructions for freezing plain raw tomatoes automatically apply to every mixed dish.
Should you blanch tomatoes before freezing?
The freezing method differs from many vegetables that are blanched to preserve quality. The NCHFP provides raw tomato freezing methods and cooked preparations rather than requiring a standard vegetable blanch for every tomato.
Brief hot-water treatment may be used to slip skins, but that is a peeling step, not the same thing as blanching peas or cauliflower for frozen storage.
Follow the tomato-specific preservation instructions instead of copying timings from green beans or other produce.
How to pack frozen tomatoes effectively
Use freezer-rated bags or containers that seal tightly. Minimise unnecessary air around whole fruit and leave appropriate expansion space for liquid products.
Write the contents, date and whether the pack is raw or cooked. Whole frozen cherry tomatoes can look quite different from chopped cooked tomatoes once covered in frost.
Pack in quantities suited to one meal to avoid repeatedly thawing and refreezing a large batch.
How long will frozen tomatoes remain good?
A home freezer should operate at about −18°C. Freezing preserves food when handled appropriately, but flavour and texture can deteriorate over time.
Use older packets first and watch for damaged seals, heavy freezer burn or signs that the freezer has warmed unexpectedly.
There isn't a single date when every frozen tomato suddenly becomes unsafe. Storage history, packaging and quality matter, and a properly frozen product still needs safe handling after thawing.
Cooking from frozen
For soup, stew or sauce, add frozen tomatoes directly if the recipe and pan allow it. Allow additional cooking time while the fruit thaws and the dish returns to temperature.
The tomatoes release liquid as they soften. Reduce the sauce gently if necessary rather than immediately adding extra water.
For a smooth tomato soup, blend after the vegetables are thoroughly cooked, taking appropriate precautions when handling hot liquid in a blender.
Using thawed tomatoes
For recipes needing thawed pieces, thaw in a clean covered container in the fridge. Catch any juice that comes out.
The flesh will be soft and may collapse when handled. This is normal and makes the fruit better suited to cooked dishes than raw sandwiches.
Don't leave a bowl of defrosting tomatoes on a warm counter all day. Treat the thawed produce hygienically and use promptly.
Can you freeze cherry tomatoes?
Yes. Small tomatoes are especially convenient because they can be frozen whole and added by the handful to a cooked dish.
Wash, dry and remove stems, then freeze using suitable packaging. For individual portions, a tray-first freeze can reduce clumping.
Cherry tomatoes may split as they freeze or cook. That's usually fine in a sauce, but they're not ideal for a dish requiring perfectly intact raw-looking fruit.
How do frozen tomatoes compare with tinned?
Tinned tomatoes have been processed for shelf stability and often have a cooked flavour. Home-frozen tomatoes retain more of their fresh character initially but soften considerably during freezing.
In a chilli or soup, either can work, although the liquid and seasoning may need adjusting. Don't substitute by volume blindly if the recipe depends on a particular sauce consistency.
Frozen tomatoes are most attractive when you have good fruit to preserve. They don't automatically offer better results than an inexpensive tin bought out of season.
Important distinction: do not improvise canning
Home-canned tomatoes require tested recipes, appropriate acidity and processing. The NCHFP stresses that acidification matters for safe canning of tomatoes.
Do not freeze a batch in ordinary glass jars, thaw them and assume the jars can then be kept in a cupboard. Freezing and shelf-stable preservation are entirely different processes.
If you want to bottle tomatoes, use current tested canning instructions from a recognised food-preservation authority.
Common freezing mistakes
The first is freezing spoiled fruit. Neither cold temperature nor later cooking reliably restores poor-quality ingredients.
The second is freezing an enormous container that takes a long time to chill and leaves you having to thaw more than one recipe needs.
The third is expecting crisp slices after thawing. Choose soups, sauces and cooked meals instead.
The easiest solution to a tomato glut is to freeze sound ripe tomatoes in the form your future recipes require, label them clearly and use them straight into cooking where practical.