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Homemade blackberry jam without pectin captures the deep, rich flavor of summer berries in a thick, spreadable preserve that comes together with just two ingredients. Blackberries are naturally high in pectin, so they set beautifully on their own with nothing more than sugar and a bit of patience at the stove.
Table of Contents
- Notes from My Kitchen
- Choosing Blackberries for Jam
- Sugar Options for Blackberry Jam
- Ingredients for Blackberry Jam
- How to Make Blackberry Jam
- Testing for Gel Stage
- Canning Blackberry Jam
- Altitude Adjustments
- Yield Notes
- Storage Options
- Recipe Tips
- Ways to Use Blackberry Jam
- Blackberry Jam FAQs
- Jam Recipes
- Blackberry Jam Recipe Without Pectin
- Canning Recipes
Blackberry jam is my husband’s absolute favorite preserve, and it’s the one jam we make every single summer without fail. I’ve been making homemade jam for years now, and this recipe remains one of the simplest and most foolproof in my collection.
Blackberries are naturally high in both acid and pectin, which means they gel easily without added thickeners. That makes this one of the best jams for beginners, and one of the easiest to adapt based on your personal taste. Even if you’ve never made jam before, this is a great place to start. My beginner’s guide to water bath canning covers everything you need to know about the canning process itself.
This particular jam works well as a low sugar preserve or with traditional amounts of sugar, and I’ve included instructions for both variations below. You can choose to use more or less, or anywhere in between.
Notes from My Kitchen
The beauty of this recipe is how forgiving it is. Unlike pectin-based jams where you have to follow exact ratios, blackberry jam without pectin gives you flexibility. Want it less sweet? Use less sugar. Prefer a firmer set? Cook it a bit longer. Once you’ve made this a few times, you’ll develop a feel for exactly how you like it. If you enjoy this recipe, try raspberry jam or strawberry jam using the same no-pectin method.
One thing I’ve learned: stay at the stove and stir constantly. Blackberry jam foams dramatically as it cooks, and it can overflow if you’re not paying attention. I keep a long wooden spoon in hand the entire time, stirring down the foam and scraping the bottom to prevent scorching.
Choosing Blackberries for Jam
Any kind of blackberry works here, whether wild, cultivated, or even frozen berries from the grocery store.
- Wild blackberries tend to have more pectin and firmer fruit. The berries often stay whole in the jam unless you choose to mash them. If you’re foraging wild blackberries (or related species like dewberries), be sure to pick them fully ripe. Slightly underripe berries can be pretty tart and don’t release juice as easily during cooking.
- Cultivated blackberries tend to be juicier and sweeter, and will fall apart into a smoother jam. If you’re using sweeter cultivated berries, you may want to add a splash of lemon juice for balance.
- Frozen blackberries have a bit less pectin since freezing breaks down pectin in fruit. The jam will still set with frozen fruit, but it may have a slightly less firm set and lower yield than with fresh.
I’ve made the equal parts sugar/blackberries and your low sugar recipe and yours is by far the best recipe I’ve come across. This is the first review I’ve ever left for any recipe that I’ve ever cooked! It’s that good!
Sugar Options for Blackberry Jam
This recipe works with just about any amount of sugar, which makes it incredibly versatile. Here are a few ratio guidelines to help you choose the right version for your taste:
- Perfect Blackberry Jam (Recommended): Use 4 cups sugar to 6 cups mashed fruit. This is the amount currently recommended by the National Center for Food Preservation and strikes a nice balance between sweetness and fruit flavor.
- Low Sugar: Use 2 cups sugar to 6 cups mashed fruit. A nice set, but reasonably tart and more fruit-forward. The perfect spot if you like low sugar but still want a high quality jam.
- Old Fashioned High Sugar (Traditional): Equal parts sugar and mashed fruit. Very sweet with a firm set and high yield. This is too sugary for my tastes, but some people really love those old fashioned candy preserves.
You can also use honey or maple syrup instead of sugar. Just keep in mind that they’re sweeter by volume, so start with about two-thirds the amount of sugar and taste as you go. A thermometer helps here since the visual cues are harder to read with alternative sweeteners.
No matter how much (or little) sugar you use, the jam will still be safe for water bath canning because blackberries are naturally high in acid.
Ingredients for Blackberry Jam
- Fresh Blackberries: You’ll need about 3 pounds of whole berries (12 cups as purchased) to yield 6 cups of mashed fruit. Any variety works, including wild, cultivated, or frozen.
- Sugar: Use 2-6 cups depending on your sweetness preference (see ratios above). The recipe as written uses 4 cups for a balanced flavor.
- Lemon Juice (Optional): 1-2 tablespoons of fresh lemon juice brightens the flavor and helps balance sweeter cultivated berries. Skip it if your berries are already quite tart. Since blackberries are naturally acidic enough for canning, fresh lemon juice works fine here (no need for bottled).
How to Make Blackberry Jam
Making blackberry jam without pectin is straightforward, but it does require your attention at the stove. Plan for about 30-40 minutes from start to finish.
Preparing the Berries
Rinse and sort your fresh blackberries, removing any stems, leaves, or damaged fruit. Use a potato masher to crush them in a large mixing bowl or directly in the jam pot. Generally, 2 cups of whole fruit yields about 1 cup of mashed fruit.
Cooking the Jam
Combine your mashed berries and sugar in a large, deep jam pot. If you’re using lemon juice, add it now. Bring the mixture to a boil over medium-high heat, stirring frequently. Blackberry jam tends to foam a lot, so keep a close eye and use a deep pot to prevent overflow.
Some people add a little butter (about ¼ teaspoon) to reduce foaming, which is considered safe even for canning, but I usually skip it. Staying present and stirring keeps the foam down naturally, and the National Center for Food Preservation notes that butter may cause off-flavors in long-term storage.
Continue cooking for 20-30 minutes, stirring constantly and scraping the bottom of the pot to prevent scorching. As the jam cooks, the foam will subside and the mixture will thicken and turn glossy. This is your cue that you’re getting close to gel stage.
Testing for Gel Stage
There are several reliable ways to test if your jam is ready:
- Freezer plate test: Before you start cooking, put a small plate in the freezer. When you think the jam is ready, spoon a little onto the cold plate, wait 30 seconds, and run your finger through it. If it wrinkles and holds a line, it’s done. If it runs back together, keep cooking.
- Temperature test: Use an instant-read thermometer. Jam sets at 220°F (104°C) at sea level. Subtract 2°F for every 1,000 feet of elevation above sea level.
- Sheeting test: Dip a spoon into the jam, hold it sideways over the pot, and watch how the jam falls. If it falls off in a sheet or a slow blob (not individual droplets), it’s likely ready.
- Don’t overcook! Jam can quickly go from perfect to too thick if you push it past the gel point. When in doubt, pull it off the heat sooner rather than later.
Canning Blackberry Jam
Once your jam reaches gel stage, remove it from heat and skim off any remaining foam if desired. Ladle the hot jam into prepared jars, leaving ¼ inch headspace. Wipe the rims clean, apply lids and rings, and process in a boiling water bath.
Altitude Adjustments
Processing times must be adjusted based on your elevation:
- 0-6,000 ft: 10 minutes
- Above 6,000 ft: 15 minutes
Yield Notes
Understanding blackberry measurements helps you plan your batch:
- 2 cups whole blackberries = 1 cup mashed fruit = about ½ pound
- 6 cups mashed blackberries + 4 cups sugar = about 5-6 half-pint (8 oz) jars
- Maximum batch size: This recipe can be doubled, but don’t increase beyond that. Larger batches don’t cook evenly and may not set properly.
Final yield depends on the berries’ moisture content and how thick you cook the jam. Longer cooking = thicker jam = lower yield.
Storage Options
You have several options for storing your blackberry jam:
- Canned jam: Properly sealed jars keep for 12-18 months in a cool, dark pantry. This is my preferred method because it means blackberry jam all winter long.
- Refrigerator jam: Let jars cool and store in the fridge. Use within 3-4 weeks.
- Freezer jam: Use freezer-safe containers with headspace for expansion. Lasts up to 6 months frozen.
- Once opened: Refrigerate and use within 2-3 weeks. Low sugar jams spoil faster once opened than high sugar versions, so keep that in mind.
Recipe Tips
- Removing seeds: If you prefer seedless jam, run the cooked berries through a fine mesh strainer or food mill before adding sugar. You’ll still keep the pulp for a proper jam texture, just without the seeds. For a completely smooth, seedless spread, make blackberry jelly instead by straining through a jelly bag.
- Foam management: Blackberry jam foams heavily during cooking. Stirring constantly helps, and you can add ¼ teaspoon butter if needed. Skim any remaining foam before jarring.
- Jam too thick? If your jam set too firm, stir in a bit of boiling water before using, or warm the jar to loosen it. Overcooked jam still makes a great glaze for cakes, roasted meats, or drizzled over ice cream.
- Jam didn’t set? The most common reason is undercooking. Make sure it reaches 220°F (at sea level) or passes the freezer plate test. You can recook runny jam by bringing it back to a boil until it hits the proper temperature.
- Flavor variations: Stir in a splash of Chambord or cassis liqueur after cooking, just before jarring. A pinch of cinnamon or cardamom gives warm, spiced notes. You can also mix in raspberries, blueberries, or cherries for a custom blend.
Ways to Use Blackberry Jam
Beyond toast and PB&J, blackberry jam is incredibly versatile in the kitchen. Swirl it into yogurt or oatmeal, use it as a filling for thumbprint cookies or layer cakes, or warm it slightly and drizzle over vanilla ice cream. It also makes a wonderful glaze for pork tenderloin or duck breast. If you find yourself with more jam than you know what to do with, check out my guide to 100+ ways to use up a jar of jam for more inspiration.
Blackberry Jam FAQs
Yes! Blackberries are naturally high in pectin, so they don’t need any commercial pectin to gel. With a bit of patience and the right sugar-to-fruit ratio, you can get a perfect set using just blackberries, sugar, and optionally lemon juice. This is one of the easiest jams to make without pectin.
The most common reason is undercooking. Without added pectin, this recipe relies on evaporation and temperature to set. Keep cooking until the jam reaches 220°F at sea level (or 8°F above your local boiling point) and passes the freezer plate test. If your jam is still runny after cooling, you can recook it by bringing it back to a boil until it reaches the proper temperature. Sometimes jam that looks thin while hot will still set once it cools completely.
You have two options. For seedless jam that still has pulp, run the cooked berries through a fine mesh strainer or food mill before adding sugar. This removes the seeds while keeping the fruit texture. For a completely smooth, seedless spread, make blackberry jelly instead by straining the juice through a jelly bag. You can also find a seedless blackberry jam recipe with detailed instructions.
Yes, when properly sealed in a water bath canner, low sugar jams last just as long as full sugar jams (12-18 months in the pantry). The canning process is what preserves the jam, not the sugar. However, once opened, low sugar jams spoil faster in the fridge. Expect to use an opened jar of low sugar jam within 2-3 weeks, whereas high sugar jams can last months refrigerated.
Many fruits have enough natural pectin to set without added pectin. Raspberry jam, strawberry jam, blueberry jam, and plum jam all work beautifully using this same basic method. Stone fruits and berries tend to have more natural pectin than tropical fruits, making them ideal for old-fashioned jam recipes.
Jam Recipes
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Blackberry Jam Recipe Without Pectin
Equipment
Ingredients
- 6 cups mashed blackberries, see note
- 4 cups granulated sugar
- 2 tablespoons lemon juice, optional, see notes
Instructions
- Prepare canning setup: Wash and sterilize 5-6 half-pint jars. Place lids in hot (not boiling) water. Prepare your boiling water bath canner and keep everything hot until ready to fill.
- Crush the berries: Rinse and sort fresh blackberries, removing any stems or debris. Use a potato masher to crush them in a large bowl or directly in the jam pot. Generally, 2 cups whole fruit yields about 1 cup mashed.
- Combine fruit and sugar: Place crushed blackberries in a large, deep jam pot. Stir in sugar and optional lemon juice. Mix thoroughly to help sugar dissolve before heating.
- Bring to a boil: Turn heat to medium-high and bring to a steady boil, stirring frequently to prevent scorching. Blackberry jam foams heavily, so stay nearby and stir often.
- Cook to gel stage: Continue boiling, stirring constantly, until jam thickens and reaches gel stage. This typically takes 20-30 minutes. Test using the freezer plate test (jam wrinkles when pushed) or an instant-read thermometer (220°F at sea level).
- Remove from heat and skim foam: Once gel stage is reached, remove pot from heat. Skim off any remaining foam if desired.
- Ladle into jars: Carefully ladle hot jam into prepared jars, leaving ¼ inch headspace. Wipe rims with a clean damp cloth, apply lids, and tighten bands to fingertip tight.
- Process in water bath canner: Place jars in boiling water bath canner, ensuring they're fully submerged with 1-2 inches of water above lids. Process for 10 minutes (15 minutes above 6,000 feet).
- Cool and store: Remove jars and let sit undisturbed for 12-24 hours. Check seals, label, and store in a cool, dark place for up to 18 months.
Notes
- Recommended (4 cups): Balanced sweetness with good fruit flavor
- Low Sugar (2-3 cups): More tart and fruit-forward; may take longer to reach gel stage
- Traditional High Sugar (6 cups): Very sweet with firm set; old-fashioned style
- Freezer plate test: Spoon jam onto a cold plate, wait 30 seconds, push your finger through. If it wrinkles and holds a line, it’s done.
- Temperature test: Jam sets at 220°F at sea level. Subtract 2°F for every 1,000 feet of elevation.
- Sheeting test: Dip a spoon in jam and hold sideways. If jam falls in a sheet (not droplets), it’s ready.
Nutrition
Nutrition information is automatically calculated, so should only be used as an approximation.
Canning Recipes
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Can I remove the seeds from this recipe by using cheese cloth
If you remove the seeds with cheesecloth, you’ll get blackberry jelly. Also delicious, but very different. There’s a blackberry jelly recipe here:
https://practicalselfreliance.com/blackberry-jelly/
You can also make a seedless jam, using a fine mesh screen instead of cheesecloth. Then you’ll still keep the pulp. That process is here:
https://creativecanning.com/seedless-blackberry-jam/
Hi! Thank you so much for the recipe. What are the preservation times of this low sugar jam? If I seal it, Would it last 5 months? Thank you
If sealed in a waterbath canner, low sugar jams last just as long as full sugar jams. The canning is what’s doing the preservation, not the sugar. That’s so long as they’re sealed. Once opened, however, low sugar jams spoil in the fridge much faster than full sugar. Expect to eat a low sugar jam in 2-3 weeks, where as higher sugar jams can last months in the refrigerator.
Morning Ashley, My large batch of jam, 10 cups berries, past the freezer test but never fully jelled once put in jars and cooled. Is it wrong to reheat and add pectin? Otherwise it was a delicious batch of wild berries.
Amy
Sorry it didn’t gel, but odd it passed the freezer test? Strange. Anyhow, yes, you can re-heat and add pectin. Best of luck with it.
Oh, my! What an excellent and easy recipe! My most favorite jam in the whole world is boysenberry, and I picked some fresh ones up at a local farmers market and used this recipe. Used 6 cups berries, 2/3 cups maple syrup, 2 tablespoons of granulated sugar, 2 tablespoons of lemon juice, half a teaspoon of refined (so no flavor) coconut oil, and at the very end before filling the jars, I added half a tablespoon of Chambord (black raspberry liquor). Totally mind blowingly delicious. I don’t mind the seeds, but some of my gift recipients do, so I’ll consider sieving them out the next time I make this jam. Thank you, Ashley!
You’re quite welcome!
Absolutely delicious and great consistency. LOVE IT.
So glad you liked it!
How long does this recipe roughly keep, unopened or opened, in the fridge?
It should keep several weeks in the fridge once opened, assuming you keep it free of contamination. What really gets jam is when you use a dirty spoon (with crumbs or butter, etc) to serve it. If you use a clean spoon to serve it lasts a lot longer. Unopened, they should last a really long time in the fridge. The only thing to watch out for is visible mold on the top, and that’s when you know to throw it out. Absent that, it’s probably still good. Enjoy!
This sounds deceptively easy, can’t wait to try. But is there a way to get the seeds out?
If you want to get the seeds out, briefly cook the blackberries while mashing them, and then pass it through a fine mesh strainer or food mill to remove the seeds. Or, alternately, you can make blackberry jelly instead which is seedless: https://practicalselfreliance.com/blackberry-jelly/
This receipe was wonderfully simple and absolutely delicious! My mom loves blackberry jam. She grew up in the south and grew up eating this. We used less sugar and it was still devine.Thank you!
So glad you enjoyed it!
Thank you for such a simple but delicious recipe. I appreciate your explanation about the amount of sugar or no sugar suggestions. I am very pleased with the results. Yummy!!!!
I’ve made the equal parts sugar/ blackberries and your low sugar recipe and yours is by far the best recipe ive come across. This is the first review I’ve ever left for any recipe that I’ve ever cooked! It’s that good ! 😎
That’s wonderful. We’re so glad you liked it.
Hi Ashley I made this blackberry jam last night using 10 c. blackberries, 6 c. sugar and 5-6 Tbsp. lemon juice.
It turned out good and had a semi-firm set. I cooked it for about 45-60 minutes (I wasn’t really paying attention to the time). We tried some today on bread and peanut butter and it’s delicious! Thank you for sharing a recipe that doesn’t require pectin. I have been really missing the availability of Certo Light (pectin for low sugar jams). Jean
You’re very welcome. We’re so glad you enjoyed the recipe.
Jam turned out fantastic with just one cup of sugar.
Is it possible to add jalapenos safely to the jam recipe?
It’s not a good idea to just add jalapenos to the blackberry jam since the jalapenos are a non-acidic food and can affect the acidity of the recipe. You might be able to find a recipe that has been tested for safety.
Sorry for my stupid question, but what would be the weight ( ounces or grams) of your 5 cups of blackberries.
Thanks so much 🙂
It’s not a stupid question at all but I’m not sure exactly what the weight would be. I did do a quick internet search and it looks like 1 cup of blackberries weighs roughly 5 ounces. So you could start out around 25 ounces and see how that works.
I would like to make a blackberry Pear Jam but I am definitely a beginner and not sure on my ratios, plus with adding the pear, Do I have to use pectin or does it still gel because of the blackberries?
Pears are also a high pectin fruit. We actually have a recipe for pear jam with no pectin as well. You should definitely be able to incorporate the pears into this recipe with no problem.
If you make this recipe the way it was written by Ashley you cannot go wrong. And the taste with less sugar is absolutely fabulous! I love that you don’t even need pectin with the rising costs of it. Thank you Ashley!