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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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How do you clean the blackberries before you use them?
You can just give them a quick rinse or a good soak in some water with a little vinegar may help to remove any insects that might be hiding away.
Delicious. Turned out perfect the first time. Testing on a frozen plate was helpful.
So glad you enjoyed the recipe.
First time I have ever made a jam of any kind. This turned out amazing. Thanks again for the recipe.
You’re very welcome. I am so glad you enjoyed the recipe.
Of course another go to recipe for the best blackberry jam! First time making it and it was wonderful. simple, quick to make and easy. Thanks!
Well, I’ve stood here stirring this for over an hour, it has never gelled on a plate, and tastes increasingly weird. Right down the drain with half my berries and on to low-sugar SureJel tomorrow.
Oh no, I’m sorry that happened. That’s so disappointing.
I grew up in the South, so blackberry jam from Mom’s or Grandma’s kitchen was always a staple and the best. This reminds me of my childhood. I’ve made this Blackberry Jam several times over the past two months. IT IS EASY AND HAS AMAZING FLAVOR! I’ve had zero issues with the entire process. I make lemon marmalade as well as strawberry freezer jam as well. Thanks for sharing this recipe.
You’re welcome. So glad you enjoyed the recipe.
Just did this with Raw sugar (turbinado)…worked like a charm. Great fruit forward flavor. My wife is T2DM and using raw sugar in baking is a sugar higher on glycemic index plus is coarse. So, 1 cup raw is less volume that 1 cup white sugar. I use this all the time for low sugar (pink pectin) jam recipes! Will. ditch pectin altogether as I want as close to natural as possible with low sugar. Thanks for the recipe!
Can I freeze Blackberry Jam?
Yup!
Thank you.
I made this yesterday and it turned out very good. Thak for sharing the recipe!
Wonderful, glad you enjoyed it!
Goes great on Waffles
Every other jam recipe I’ve made requires 10 minutes in a boiling water bath; I noticed yours only goes in for 5 minutes. Can you confirm that 5 minutes is the correct amount of time? Would the lesser time be because of less sugar and no pectin?
Thank you!
That’s a really good question!
I’ll go back in and clarify in the recipe, but the process times for jams/jellies aren’t recipe specific, and 5 minutes is what I use with hot sterile jars and I should make that clear. The guidance from the national center for food preservation says 5 minutes if you use hot sterilized jars, and 10 minutes otherwise. (https://nchfp.uga.edu/publications/uga/uga_jams_jellies.pdf)
They used to say sterilizing the jars before canning was mandatory, but now in more recent canning guidance, they say you can just use clean but unboiled jars if you process the jars for at least 10 minutes. That’s why now jam recipes are saying process for 10 minutes instead of 5, because more and more people are just using unboiled jars for canning. (When I started canning, boiling the jars was not optional. I’ll go in and update the recipe to say 10 minutes to make sure all people just starting to can with the new recommendations are doing it correctly and processing it long enough.)
Thank you so much for the question!
Thank you! I used the least of amount of sugar possible, according to your recipe, plus a TB of lemon juice… wow. It was perfect. And sweet. I can’t imagine how sweet the regular jam recipes are. I came looking for a low sugar recipe when seeing many recipes had about as much sugar as fruit. Ugh.
I not only used your recipe for blackberry jam, but I just made some raspberry jam, too. Sooooo good.
That’s great. So glad you enjoyed the recipe.
AMAZING blackberry jam! THANK YOU!!!!
For fewer pips, I liquided half the blackberries and rubbed them through a sieve.
Put in some crystalized honey and the juice of a lemon. 25 minutes later the jam looked and felt a bit more jam-like, indeed, it was ready.
Why should anyone use sugar? This stuff will convert us 🙂
You’re welcome, Monika! I’m so glad you liked it!
I add a grated apple to berry mixture for more pectin and quicker jelling. It’s great. Thank you.
That’s great. You’re welcome.
Came out too thick. Guess I overcooked it. Can it be thinned down s but. If yes, what should I use?
I’ve been making conventional jam, but really wanted try something less sugary. I tried this recipe today, although I added 1tsp cardamom and 1/2 tsp cinnamon to the recipe, because I wanted to try that! It turned out amazing. I will be using this recipe going forward as I like the idea of more berries and less added sugar.
Just finished cooking a large saucepan of berries and sugar (and dash of lemon juice). Not sure if I cooked it long enough; even if it’s loose I don’t mind. I’m having some right now spooned over greek yogurt, yum! thanks for the recipe, pics, and nice responses to repeat questions 😀 Holly in Northern Vermont
Can you freeze this for longer storage?
Yes. It’ll only last a few weeks in the refrigerator or 6 months in the freezer. Be sure to use freezer-safe jars (ones with straight sizes, no shoulders at the top). If you buy ball canning jars the cardboard packaging says if they’re freezer safe or not. (You can also water bath can this recipe and it’ll be shelf-stable for years if done properly.)
Thank you Ashley.
Do i just put it in the jar, let it cool and then put it on the freezer ? Sorry never done anything like this before.
Yes, that’s all you need to do. I sometimes will leave the lid off until it is frozen to leave plenty of space for expansion.
First time I’ve made blackberry jelly. Followed your instructions and strained the seeds out before adding sugar. I did a 1:2 ratio. Very sweet! It’s good, and very thick, but you’re right it’s like candy. lol I would reduce it even more next time, though this time I didn’t have many berries so I wanted more volume and went with more sugar. Hardest part was getting it to 220F without making a mess or burning myself. It was a ride.
Glad it worked out for you!
Hi, I’m not sure what I did wrong. I used 5 cups of blackberries and 1 cup of sugar and squeezed half a lemon. I put on med low heat (around 3 or 4 on my stove), and it never foamed! It did simmer though. I ended up taking it off the stove after almost an hour. I tried it this morn and the flavour is great though seedy, but the texture is barely spreadable. I had to warm it up. Any suggestions?
If it never foamed then it never got hot enough. Medium heat varies based on your stove, definitly need to cook it a bit hotter than yours got.
I’ve been reading your recipe and it sounds amazing! Do you think it would work to use a 1:5 ratio of date syrup to berries instead of sugar and still be able to can it? How long do you think it will last once canned if date syrup is used?
Thank you very much! Off to pick berries now…
Hmmm…I’ve only ever tried date syrup once, but I’ve never canned with it. Has a strong flavor if I remember correctly, like mild molasses and that will get stronger as you cook the jam. It should gel in theory since it’s sugar, but it may darken/burn before it reaches the right concentration. It also may taste stronger than you’d like once cooked. Try it though, and let me know how it goes. I’m curious now…
Thank you for getting back to me. I did make it and taste good, however the one sweeten with sugar taste better. Thank you for your help.
Bartolo
You’re welcome!