How to Can Fire Roasted Tomatoes Safely at Home

Fire roasted tomatoes can be canned at home if you treat roasting as a flavor step, then process the tomatoes as a tested tomato product. That means acid in every jar, no oil in the jars, and a processing time that matches how you pack them.

Store-bought fire roasted tomatoes taste smoky because the fruit is blistered until the skins char. Home canning can get that same flavor from a broiler, grill, or very hot oven. The part most recipes gloss over is safety: modern tomatoes are not reliably acidic enough on their own, and adding oil, garlic, onion, or peppers changes the product. Follow the rules below and you get jars that work like canned fire roasted tomatoes in chili, soup, salsa, and braises.

Jump

What “fire roasted” means when you are canning

Commercially, fire roasted tomatoes are peeled or diced tomatoes charred over flame, then packed in juice or puree. The dark flecks in the can are charred skin, not spoilage.

At home, “fire roasted” is a preparation method, not a separate USDA recipe. There is no official process titled only for fire roasted tomatoes. You roast first, then can the tomatoes as one of these tested styles:

Whole or halved tomatoes packed in water
Whole or halved tomatoes packed in their own juice, or packed raw with no added liquid
Crushed tomatoes with no added liquid

Roasting concentrates flavor and makes skins slip off easily. It does not replace acidification or the correct process time.

Safety rules that matter more than the recipe

Tomatoes sit near the acid/low-acid line. Variety, ripeness, and growing conditions can push pH above 4.6, the point where Clostridium botulinum can grow in a sealed jar. Extension services therefore require acid in every jar of whole, crushed, or juiced tomatoes, whether you use a water bath or a pressure canner.

Add one of these to each jar before filling:

Acid	Pint	Quart
Bottled lemon juice (from concentrate)	1 tablespoon	2 tablespoons
Citric acid	1/4 teaspoon	1/2 teaspoon
Vinegar, 5% acidity	2 tablespoons	4 tablespoons

Use bottled lemon juice, not fresh. Fresh citrus varies too much in acidity. Vinegar is approved but can change the flavor. Citric acid adds acid with almost no lemon taste. Sugar can be added later to soften sharpness; it does not replace acid.

Do not put oil in jars meant for the pantry. NCHFP does not recommend preserving tomatoes in oil. Oil can trap moisture around bacteria and can damage lid gaskets. Roast dry. Oil belongs in a refrigerator jar you plan to eat within days, not in a shelf-stable canning recipe.

Skip low-acid add-ins unless you have a tested recipe for that exact product. Garlic, onion, peppers, and olive oil make a different food. Those mixtures need a tested salsa or sauce formula, and many of them require pressure canning. Do not “just add a clove” to plain tomato jars.

Do not can damaged, decayed, or frost-killed fruit. Tomatoes from dead vines are a higher-risk raw material. Use sound, vine-ripened tomatoes.

Oven canning and open-kettle canning are not safe methods.

Best tomatoes and how much you need

Paste tomatoes give the closest result to a commercial can: Roma, San Marzano, Amish Paste, Opalka, and similar meaty types hold shape better and throw off less watery liquid. Slicing and heirloom tomatoes work, but jars will be juicier and the pieces softer after processing.

Yellow and low-acid heirlooms still need the full acid amount. Color is not a pH test.

Plan on roughly:

13 pounds of tomatoes for 9 pints
21 pounds for 7 quarts
About 2-1/2 to 3 pounds per finished quart

Roasting drives off some water, so a roasted batch often yields a little less volume than raw-pack tomatoes from the same weight.

How to fire roast tomatoes for canning

The goal is blistered, blackened skins and softened flesh, not a puddle of oil-roasted vegetables.

Prep

Wash the tomatoes.
Core them.
Cut in half (quarters for large fruit).
Squeeze each half gently over the sink or a bowl if you want fewer seeds and less watery jars.
Set cut-side down on a rimmed sheet pan. Do not oil the pan if you are canning.

Broiler method (closest to “fire roasted”)

This is the method most home canners use when they want charred skin flecks like store cans.

Place the rack 4 to 6 inches from the broiler.
Broil on high until skins blister and blacken in spots, usually 8 to 12 minutes. Watch closely after 6 minutes.
Cool until you can handle them.
Pull off skins. Leave a few charred bits if you want that commercial look.

Work in batches. One tray cooling while the next broils keeps the kitchen moving.

Grill method

Use a grill basket or a wire rack over a sheet pan so small pieces do not fall through. Grill over high heat until skins char and the flesh softens, turning once. This gives the most smoke. Still add no oil if the tomatoes are going into canning jars.

Hot oven method

Roast at 425–450°F until collapsed and browned at the edges, about 30 to 50 minutes depending on size. Oven roasting caramelizes more than it chars. Flavor is deeper and sweeter, with less of the black-fleck taste of broiler or grill tomatoes.

After roasting, chop to the size you want: halves, quarters, or a rough dice. Fine dice turns to pulp during a long boil in the canner.

Choose pack style before you heat the canner

This is where many blog recipes disagree, and the disagreement is not cosmetic. Process time depends on density and whether liquid was added.

Packed raw, no added liquid (85 minutes for pints or quarts at 0–1,000 feet) Fill jars with roasted tomatoes. Press until the juice they release fills the gaps. Leave 1/2-inch headspace. This is the safest match if you pack roasted pieces tightly in their own juices and do not add water. Water-bath time is long because heat moves slowly through a dense pack.

Packed in water (40 minutes for pints, 45 minutes for quarts at 0–1,000 feet) Fill jars with tomatoes, then add boiling water to cover, still leaving 1/2-inch headspace. Heat penetrates faster. Jars look more like “tomatoes in juice,” with more liquid after cooling.

Hot-pack crushed style (35 minutes for pints, 45 minutes for quarts at 0–1,000 feet) Chop the roasted tomatoes, heat them in a pot until they boil, then simmer about 5 minutes. Pack hot tomatoes and their juices. This gives a product closer to fire roasted crushed tomatoes and usually less floating fruit.

If you are new to canning tomatoes, hot-pack crushed or water-pack is easier to process and less likely to leave underheated centers than a tight raw pack.

Altitude adjustments for a boiling-water canner

Add time above 1,000 feet. A common pattern:

1,001–3,000 feet: add 5 minutes
3,001–6,000 feet: add 10 minutes
Above 6,000 feet: add 15 minutes

Use the table that matches your exact pack style from NCHFP or your state Extension service. Do not guess.

Equipment you actually need

Water-bath canner or a deep stockpot with a rack, or a pressure canner
Pint or quart canning jars, new lids, rings
Jar lifter, funnel, bubble remover or thin spatula
Bottled lemon juice or food-grade citric acid
Clean towels and a vinegar-damp cloth for wiping rims

Wash jars in hot soapy water. Keep them hot until filling. For processes longer than 10 minutes, full pre-sterilizing is not required if jars stay hot and you process the full time, but dirty or cool jars cause seal failures.

Step-by-step: water bath canning fire roasted tomatoes

Fill the canner with enough water to cover filled jars by 1 to 2 inches. Start heating.
Roast and peel the tomatoes as above. Chop if you want diced pieces.
Decide pack style (no extra liquid, water pack, or hot crushed pack).
Place acid in each hot empty jar. Add optional salt: 1/2 teaspoon per pint or 1 teaspoon per quart. Salt is for flavor only.
Fill jars, leaving 1/2-inch headspace.
Slide a spatula around the inside to release air bubbles. Recheck headspace.
Wipe rims with a cloth dampened with vinegar. Food on the rim prevents a seal.
Apply lids and screw bands fingertip-tight, not cranked down.
Lower jars into boiling water. Water must cover the lids by at least 1 inch.
Start timing only when the water returns to a full boil. Keep a steady boil for the full process time.
Turn off the heat. Let jars sit in the canner 5 minutes.
Remove to a towel. Do not tighten rings. Leave undisturbed 12 to 24 hours.
Check seals: the lid center should be down and should not flex. Remove rings, wash jars, label, and store without rings.

Unsealed jars go in the refrigerator and should be used promptly, or the contents can be reprocessed within 24 hours with a new lid.

Pressure canning option

Pressure canning is allowed for acidified tomatoes and shortens stove time. It is not an excuse to skip acid. USDA pressure times for tomatoes were written as an equivalent heat treatment for acidified tomatoes, not as a botulism process for unacidified tomatoes.

Typical pressure options at 0–1,000 feet (confirm against current NCHFP tables for your pack and canner type):

Water-packed whole or halved: about 10–15 minutes, depending on the table and pressure
Packed without added liquid: 25 minutes at 11 pounds on a dial-gauge canner (0–2,000 feet), or the weighted-gauge equivalent
Crushed tomatoes: often 15 minutes at the higher pressure option

Follow your canner manual for venting (usually 10 minutes of steady steam) and for weighted-gauge versus dial-gauge pressure. Increase pressure at higher elevations.

What the finished jars will look like

Raw-pack roasted tomatoes often float, then settle as they cool. A layer of watery liquid on top is common, especially with juicy varieties. That is separation, not spoilage, if the seal is good and the jar looks and smells normal when opened.

Pieces will be softer than the day you packed them. Long water-bath times break cell walls. If you want distinct chunks in chili later, pack larger pieces and expect some breakdown anyway.

Charred specks are normal if you left roasted skin bits in the jar.

Mistakes that ruin flavor or safety

Oiling the tomatoes “just a little” before the oven. A film of oil in the jar is the problem, not the roasting method. Dry roast for canning.

Using 40-minute timing on a dense, no-liquid pack. If the jar is full of pressed tomato solids and no added water, use the longer no-liquid process or switch to a water pack or hot pack.

Adding fresh lemon juice. Bottled juice is standardized. Fresh is not.

Canning a “fire roasted salsa” by tossing in onion, jalapeño, and garlic. That is a different product. Use a tested salsa recipe with its own acid and process.

Leaving rings on in storage. Rings can hide a failed seal and rust onto the jar.

Tasting from a suspect jar. Discard jars that bulge, leak, sputter, smell off, or look moldy. Do not taste first.

How to use a jar of home-canned fire roasted tomatoes

Use them anywhere you would use a 14.5-ounce or 28-ounce can of fire roasted tomatoes:

Chili, tortilla soup, and posole
Shakshuka and baked eggs
Quick skillet sauces with sausage or beans
Braised chicken or pork
Soup bases where you want smoke without liquid smoke

Drain if the recipe is already wet. Keep the liquid for soup or to deglaze a pan.

One pint is close to a 14.5-ounce can. One quart is close to a 28-ounce can, depending on how tightly you packed.

After opening, refrigerate and use within several days.

Storage

Store sealed jars in a cool, dark place. Quality is best within a year. Cooler storage keeps color and flavor longer.

If a lid unseals in storage, refrigerate immediately and use soon, or discard if there is any doubt.

Frequently asked questions

Can I skip lemon juice if I pressure can? No. Acid is required for both methods in current USDA and NCHFP tomato directions.

Can I can fire roasted tomatoes with olive oil like restaurant antipasto? Not as a shelf-stable home-canned product. Refrigerate oil-packed roasted tomatoes and treat them as a short-term food.

Do I have to peel them? Peeling is standard in tested tomato directions and gives a better texture. Roasting makes peeling easy. A few charred skin flecks are fine and are part of the fire roasted look.

Why did my tomatoes turn watery? Juicy varieties and raw pack release liquid during processing. Next time use paste tomatoes, squeeze out some seeds before roasting, or hot-pack after a short simmer to drive off extra juice.

Can I use cherry tomatoes? Yes, but they are watery and tedious to peel. Many people roast them, then hot-pack as crushed tomatoes or a tested roasted sauce rather than trying to keep them whole.

Is freezer space a better option? Freezing roasted tomatoes is simpler and does not require added acid. Use freezing when you want roasted flavor without canning equipment, and can when you want pantry jars that do not depend on freezer space.

Can I process pints and quarts in the same load? Yes, if you use the longer time required for the larger jars.

Fire roasted flavor is worth the extra tray under the broiler. The canning part stays ordinary tomato canning: acid in the jar, no oil, and a process time that matches the pack. That combination is what makes the jars pantry-safe instead of just tasty.