Sun-dried tomatoes can go into jars, but they cannot be home-canned for the pantry the way crushed tomatoes or tomato sauce can. The National Center for Home Food Preservation (NCHFP) does not publish a tested boiling-water or pressure process for dried tomatoes, and it specifically advises against preserving tomatoes in oil: oil can shield botulism organisms trapped in a droplet of moisture, and it can also damage canning-lid gaskets.
What works instead is simpler. Fully dried tomatoes packed dry in airtight jars are a real pantry food. Oil-packed tomatoes belong in the refrigerator, for a short time, and never on a shelf as if they were canned.
Why a water bath or pressure canner does not solve this
Home canning means heating closed jars long enough, at a known temperature, to make that particular food shelf-stable. Times and pressures come from lab-tested recipes. Sun-dried tomatoes are not in those recipes.
Dried tomato is a different product from the whole, crushed, or juiced tomatoes those processes were built for. Drying removes most of the water and concentrates sugars, acids, and solids. Heat does not move through a tightly packed jar of leathery pieces the same way it moves through tomatoes in juice or water. Adding a spoon of lemon juice and boiling the jars for an hour, which some blogs recommend, is an untested guess. Under-processed home-canned food is a leading source of foodborne botulism in the United States, and the Centers for Disease Control and Prevention tells home canners to use only instructions that follow the USDA Complete Guide to Home Canning.
“Dry canning” — filling jars with dried food and heating them in an oven or canner to force a seal — is also not recommended. NCHFP notes that oven heating has never been shown to sterilize these foods or to produce a researched shelf life. A sealed lid is not proof the contents are safe.
Tomatoes themselves sit near the safety line. Modern varieties, overripe fruit, and tomatoes from dead or frost-killed vines can have a pH above 4.6, the point below which Clostridium botulinum cannot grow. That is why every tested canned tomato product still gets bottled lemon juice or citric acid, then a full process. Drying does not replace that step, and it does not create a tested canning recipe.
Why oil-packed jars are not a pantry canning project
Commercial jars of sun-dried tomatoes in olive oil are made under controls home kitchens do not have: measured acidification, checked water activity, and sometimes a commercial heat process. Copying the look of those jars is not the same as copying the process.
C. botulinum needs moisture, low acid, little or no oxygen, and warm temperatures. Oil supplies the oxygen-free part. Any pocket of tomato that is still slightly soft can hold enough water for spores to grow, even if the rest of the jar looks dry. NCHFP’s warning is specific on this point: oil may protect botulism organisms trapped in a water droplet.
Fresh garlic, fresh basil, or other raw herbs make the jar riskier still. Garlic-in-oil is a documented botulism vehicle. The CDC says homemade oils made with garlic or herbs must be refrigerated and thrown out after four days. Dried herbs are a different case from fresh sprigs, but they do not turn an oil pack into a shelf-stable canned food.
Oil is also a poor fit for canning lids. It can interfere with the gasket, so a jar that seems sealed may not stay that way.
Dry jars: the method that matches the goal
If the aim is sun-dried tomatoes in jars that sit in a cupboard, pack them dry. This is storage, not canning. Safety comes from low moisture, not from heat processing.
Paste or Roma-type tomatoes are the practical choice. They have thicker walls and less seed gel than big slicing tomatoes, so they dry faster and more evenly. Use ripe, sound fruit. Skip anything moldy, badly cracked, or from frost-killed vines.
Wash, core, and halve small paste tomatoes lengthwise, or cut larger ones into slices about 1/4 to 1/2 inch thick. Peeling is optional. A light sprinkle of salt is for flavor only; it is not a preservative here. Arrange pieces in a single layer, cut side up, without overlapping.
Dry at about 135–140°F (57–60°C) in a dehydrator, which is the most even option. An oven at its lowest setting can work if the door is cracked for airflow and the temperature stays near that range; many ovens run hotter than their dial suggests, which case-hardens the outside while the center stays wet. Sun drying only works in hot, dry, low-humidity weather, and the fruit needs protection from insects and dust. In humid climates, a dehydrator is the reliable route.
Pieces are done when they are leathery to brittle, with no visible moisture when torn or squeezed. Cool a sample before judging. Warm tomato feels softer than it will be at room temperature. If any piece bends and shows dampness inside, keep drying. A full load shrinks hard: most of the weight is water, and a dehydrator of fresh paste tomatoes often fills only a jar or two.
Condition before the jar is closed for good
Drying is uneven. A few wetter pieces can mold an entire jar. Conditioning fixes that.
Cool the tomatoes completely. Pack them loosely in a large glass or food-grade container, fill it no more than two-thirds full, and close it. Shake once a day for 7 to 10 days. If beads of moisture appear on the container, or pieces stick and feel pliable, return the batch to the dehydrator. If you see mold at any point, discard the batch. Do not try to salvage it.
Packing and storing the dry pack
Use clean, dry canning jars or other airtight containers. Jars are useful because you can see moisture or mold early. Plastic freezer bags are acceptable for short storage but are not insect-proof. A vacuum seal or an oxygen absorber can help color and flavor; neither one makes under-dried tomatoes safe.
Label with the date. Store in a cool, dark, dry place. NCHFP lists about 50–70°F as the best range for dried foods, and quality drops faster in warm cupboards or in sunlight. Plan to use dry-packed tomatoes within a year for best flavor. For longer storage, put the sealed jars in the freezer. Freezing also stops pantry moths if you suspect insect eggs in home-dried food.
What you should not do is add olive oil to these pantry jars, process them in a canner, or store them above a stove.
If you want the oil-packed texture
Treat oil as a refrigerator marinade, not a canning method.
Start with tomatoes that are already fully dry and conditioned. A brief simmer in a half-and-half mix of water and 5% vinegar, or a soak in bottled lemon juice, softens them and adds acid. Drain and pat very dry before they touch oil. Residual water is the hazard.
Pack into a clean jar, cover completely with olive oil, and refrigerate immediately. Dried oregano, dried basil, or chili flakes are safer flavor additions than fresh herbs. Leave out fresh garlic and fresh herb sprigs. Even then, this is a short-use product. Use refrigerated plain packs within a few weeks, and discard anything with garlic or fresh herbs after four days, in line with CDC guidance on homemade flavored oils. NCHFP’s broader advice still stands: preserving tomatoes in oil is not recommended. The refrigerator version is a compromise for people who want that ingredient this month, not a shelf project.
If the oil turns cloudy, smells fermented or rancid, or the tomatoes feel slimy, throw the jar out. Do not taste it to check.
When actual canning is the right tool
Canning shines for fresh tomatoes, not dried ones. Tested options from NCHFP and cooperative extension include whole or halved tomatoes in water or juice, crushed tomatoes, juice, and sauce. Every one of those recipes requires added acid even if you pressure can:
| Acid | Per pint | Per quart |
|---|---|---|
| Bottled lemon juice | 1 tablespoon | 2 tablespoons |
| Citric acid | 1/4 teaspoon | 1/2 teaspoon |
| Vinegar, 5% acidity | 2 tablespoons | 4 tablespoons |
Bottled lemon juice or citric acid changes flavor less than vinegar. Sugar may be added to offset tartness; it is not a safety step. Processing times depend on pack style, jar size, and altitude, so they have to come from the current recipe, not from memory. Pressure canning often keeps better texture than a long water bath, but acid is still required either way.
Do not rehydrate sun-dried tomatoes and run them through a fresh-tomato canning recipe. The solids, acid, and heat penetration are not the same, and the process was not tested on that product. If the harvest is large and you want both styles, dry one batch and can another batch fresh.
Freezing is the other low-risk option. Fully dried tomatoes freeze well in jars or bags and keep their flavor longer than a warm pantry allows. Oil-packed tomatoes can be frozen too, though the oil may turn cloudy and needs time to clear in the refrigerator.
Using dried tomatoes from the jar
Dry-packed tomatoes are an ingredient, not a ready-to-eat garnish, until they are softened.
Cover them with hot water, stock, or wine for 20 to 30 minutes, then drain. Save the soaking liquid for soups and sauces; it is concentrated tomato. Chopped dried tomato can also go straight into a simmering sauce or stew, where it rehydrates as the dish cooks. For a quick oil version, soften a small amount, pat dry, and cover with oil in the refrigerator the same day you plan to use most of it.
Texture expectations help. Home-dried tomatoes are often drier and chewier than the supermarket oil-packed kind, because shelf storage demands lower moisture than a jar that will live in the fridge. If you prefer them pliable, stop drying at the leathery stage only for food you will refrigerate or freeze, not for pantry jars.
What spoilage looks like
Throw out the container if you see mold, an off smell, or insects. Blackening during storage can happen in lower-acid tomatoes and is a quality issue, not automatic proof of toxin, but musty or fermented odors are not worth second-guessing. Never taste home-preserved food to test whether it is safe.
Bulging lids, spurting liquid, or fizzing apply to heat-processed jars. A dry pack should not have been processed, so a popped seal on a dry jar usually means moisture or temperature swings, not a canning failure. Dry the contents again only if they still smell clean and show no mold; otherwise discard them.
Questions readers usually still have
Can I water-bath sun-dried tomatoes if I add lemon juice? No tested process exists for that. Lemon juice is required in canned fresh tomatoes, but it does not turn an untested dried-tomato recipe into a safe one.
Are store-bought oil-packed sun-dried tomatoes unsafe? Commercial jars are produced with controls home kitchens cannot copy. Follow the label: many are shelf-stable until opened, then must be refrigerated. That label does not transfer to a homemade jar.
Do I have to pasteurize jars in the oven first? No. Clean, dry jars are enough for a dry pack. Oven heating is not a sterilization step for dried food.
Can I add a garlic clove for flavor and still store the jar in the cupboard? No. Garlic in oil is a known botulism risk. Keep any garlic version in the refrigerator and use it within four days.
How long do dry-packed sun-dried tomatoes last? Quality is best within about a year in a cool, dark cupboard. Flavor and color last longer in the freezer. Safety depends on them staying fully dry, not on a calendar date.
The useful split is this: jars on the shelf get fully dried, conditioned tomatoes and nothing else. Jars in the refrigerator can hold an oil pack for a short window, without fresh garlic or herbs. Fresh tomatoes, acidified and processed from a current USDA or extension recipe, are the ones that belong in a canner.