A tomato harvest can get out of hand in August. You pick a few ripe fruits for sandwiches, then discover another bowlful ready the next day. Freezing whole tomatoes is a useful way to save the surplus for soups and cooked sauces, and it avoids the immediate work of peeling, chopping and simmering every last one.
The limitation is texture. Once frozen and thawed, a tomato becomes soft because ice crystals break down its cells. It won't behave like a fresh salad tomato, but that is rarely a problem when it's going into a saucepan.
Choose sound ripe tomatoes
Select firm ripe tomatoes with good colour for their variety. Avoid fruit with visible mould, large soft rotten areas or an unpleasant smell.
A lightly split tomato may be suitable for immediate cooking if otherwise sound, but it isn't the best candidate for long frozen storage.
You can freeze different varieties, from cherry tomatoes to large beefsteaks. Consider separating them by size so later cooking is more convenient.
Rinse and dry the fruit
Wash tomatoes under running drinking water to remove soil and debris. Gently rub the surfaces with clean hands.
Remove attached stems and leaves. Check around the stem scar, where garden soil can remain.
Pat the tomatoes dry. Surface water can form ice on the outside and increase sticking when stored together.
Decide whether to remove the core
For some dishes, the small firm core around the stem is unpleasant. You can remove it with a clean paring knife before freezing, or leave it until later if you prefer.
Work carefully with slippery ripe tomatoes and use a stable chopping board. Don't cut towards your hand.
For small cherry tomatoes, coring each one is usually unnecessary. Larger cooking tomatoes may benefit from it.
Why you can freeze tomatoes whole
The National Center for Home Food Preservation describes freezing tomatoes, including whole tomatoes, for later use. These fruits do not require the vegetable blanching used for green beans or leafy greens to prepare them for freezing.
This is freezer preservation, not a tested home-canning process. Don't take a freezing recipe and put the product into jars for cupboard storage.
Properly frozen whole fruit is most convenient where the finished meal is cooked.
Tray-freeze to keep tomatoes separate
Arrange cleaned dry tomatoes on a tray in one layer. This is particularly useful for cherry and plum tomatoes that might otherwise form a solid block.
Freeze until the tomatoes are firm, then package promptly. A flat tray also reduces pressure on ripe fruit while it first freezes.
For very large tomatoes, you may simply package separately instead of tray-freezing, provided suitable freezer containers are used.
Package in freezer-safe bags
Move the frozen tomatoes into appropriate bags or rigid containers, leaving room for expansion where required.
Remove excess air from bags gently. Don't crush frozen fruit with the bag's zip or force too many tomatoes into a small container.
Label with the date, tomato variety if known and approximate quantity. A freezer full of unlabelled red packages becomes confusing surprisingly quickly.
Keep them at a suitable temperature
A working freezer should normally be around -18°C or colder. Avoid packing large quantities of freshly prepared room-temperature tomatoes tightly together.
Spread packages so they can freeze through efficiently, then organise them after they are solid.
If your freezer's temperature has fluctuated, evaluate food safety and quality rather than assuming the tomatoes are unaffected.
Expect the texture to change
Freezing ruptures cells within tomato flesh. After thawing, the fruit becomes soft and releases liquid, which is useful for soup but poor for a sandwich.
The peel may loosen dramatically during thawing. That often makes removing skins easier than peeling a fresh raw tomato.
Don't judge the method as a failure because the tomato no longer slices neatly. The intended use is cooked food.
Peel frozen tomatoes for sauce
One practical approach is to briefly rinse the surface of a frozen tomato with suitable water to loosen the skin, then peel it carefully before cooking.
Other cooks thaw in a covered bowl and remove skins once loosened. Follow a method suited to your recipe and handle the fruit hygienically.
Never use a sharp knife forcefully against a rock-hard frozen tomato while holding it in your palm.
Cook directly from frozen where suitable
A whole frozen tomato can go into a suitable saucepan with other sauce ingredients. Allow enough time for the centre to thaw and become thoroughly hot.
Large tomatoes may be easier to manage after partial thawing in the fridge. Avoid splashes when adding icy produce to very hot oil.
As the tomato softens, break it down with a spoon and simmer to reduce excess water.
Make a simple pasta sauce
Cook chopped onion gently in oil, add garlic near the end of the softening stage, then add your frozen tomatoes.
Let the pan simmer until the fruit breaks apart and the sauce thickens. Season to taste and add herbs when appropriate.
You may need longer cooking than with canned chopped tomatoes because whole frozen tomatoes can contain considerable water.
Use in soups and stews
Tomatoes are useful in lentil soup, vegetable stew and chilli. A bag of frozen whole fruit can replace a portion of fresh cooking tomatoes in recipes that allow the extra liquid.
If the dish includes meat, follow proper meat cooking and handling rules. Frozen vegetables don't remove those requirements.
Break larger tomatoes down once soft rather than trying to dice them on an unstable frozen surface.
Should you add salt before freezing?
For plain whole freezer tomatoes, seasoning isn't usually necessary. Keeping them unseasoned makes them more versatile across recipes.
If you prefer prepared seasoned sauce, cook and freeze a sauce instead, following suitable handling and packaging guidance.
Label salted or sweetened preparations so you don't accidentally alter a recipe's balance.
Don't freeze rotten produce
Freezing doesn't sterilise tomatoes or reverse mould and decay. Begin with good fruit and clean utensils.
A damaged tomato that needs trimming may be better used immediately in a cooked meal if suitable, rather than stored indefinitely.
Discard fruit with spreading mould or spoilage. Heavy seasoning and long simmering aren't reliable ways to rescue rotten ingredients.
Thaw responsibly
If you need tomatoes defrosted before use, place the container in the refrigerator so released liquid is contained.
Avoid leaving a bag of thawing fruit on the counter overnight. Normal food-safety handling still applies.
The juices are useful in cooked sauce, so keep them unless a recipe deliberately calls for draining.
The freezer routine
Wash and dry sound ripe tomatoes, remove stems, freeze whole in practical portions and transfer to labelled freezer-safe packaging.
Use them for cooked dishes and expect a soft texture. This makes the method a convenient solution for garden gluts without pretending frozen tomatoes will become fresh salad slices again.