Home | Low Sugar Blackberry Jam (canned)

Low Sugar Blackberry Jam (canned)

by Heather

Summer means blackberry season! I love canning low sugar blackberry jam to add onto toast, or our favorite – yogurt bowls!


Low sugar blackberry jam

Blackberry jam is super easy because you don’t have to cut or peel the fruit, just wash and mash.  I wanted to make a low sugar jam.  Most low sugar recipes still call for 4 cups of sugar, but that just seemed like a lot, so I went with less.

First I got my resources together.  The two that I pulled from were how to make blackberry jam from PickYourOwn and the SURE.JELL for less or no sugar needed blackberry jam recipe.  I followed the canning directions, but basically added sugar to the taste I liked.

If you love jams that aren’t overly sweet, do check out my easy strawberry chia jam too!


I used wild blackberries Jacob and I picked together, which I hear have more seeds in them than store bought berries.  I didn’t remove any seeds, and the jam was definitely a bit seedy.  We still like it and have been eating it, but next time I might follow the steps for how to remove half the seeds.  It’s all based on taste though, make it how you’d like to eat it!

What you’ll need for canning

  • water bath canning pot with lid
  • jar grabber
  • jar funnel
  • glass mason jars
  • lids
  • rings
  • large pot for cooking your jam
  • large spoon and ladle
low sugar blackberry jam canned
Print Recipe
5 from 1 vote

Low Sugar Blackberry Jam (Canned)

Prep Time15 mins
Cook Time10 mins
Total Time25 mins
Course: Jam
Cuisine: American
Keyword: canned, low sugar
Author: Heather


  • 6 cups mashed blackberries
  • 1 box pectin for low or no sugar recipes
  • 2 1/4 cup natural cane sugar


  • Begin by filling your large canning pot with water.  Enough water that it will still cover the jars with 1 inch of water above them once they are place in there.  This step takes the longest, so begin it right away.
  • Once your water is close to a boil, place your glass jars in the water for 10 minutes.  After that remove and place on a clean towel.
  • Place your lids in a small bowl and cover with boiling water.
  • In your large pot add the blackberries and mash over medium-high heat.  Mix together the pectin and 1/4 cup sugar.  Add into the blackberries.  Bring to a rolling boil.  Stir in remaining sugar.  Allow the mixture to thicken for 1 more minute, then remove from heat.
  • Ladle into your jar (use the jar funnel to make it less messy).  Wipe the rims down, and place your lid on, then screw the ring on next.
  • Process in a water bath for 10 minutes, then remove and allow to cool on a clean towel.  Not too long after you take them out you’ll begin to hear popping – that’s the jars sealing!  After they are completely cool, check to make sure they all sealed.  If you press down on the center of the lid it should not spring back.  If it does, refrigerate the jar.


Note:  Since I went with less sugar than the normal recommended amount, it may not stay preserved as long.  Sugar is a natural preservative, so when you reduce that, you reduce the amount of time it will be shelf stable for.
Did you make this recipe?Be sure to tag me @fitmamarealfood or tag #fitmamarealfood!

I didn’t put one of my ring on correctly (back one in the middle you can see is a bit crooked) so it didn’t seal.


No worries though, we just used that one right away.

Have you canned before?  What’s your favorite thing to make?  Or if you haven’t before, what do you want to try out?

This weekend is canning weekend with my family in Seattle.  I can’t wait!



You may also like


Erica August 27, 2013 - 11:21 am

You always amaze me! What a fun idea- I need to try making jam at home. Hope you feel better girl!

Giselle@myhealthyhappyhome August 27, 2013 - 6:08 pm

I just made blackberry jam a few weeks ago! I make it every year and love it! I also made the low sugar version. So much better than the full sugar! I’m hoping to go get tomatoes this weekend to make salsa and maybe tomato sauce. Love having homemade goodies on hand!

Katelyn August 7, 2015 - 7:19 pm

How long would you recommend these are shelf stable for? Also what is a good method to remove seeds? I’m going to make a low sugar 5 berry jam for the first time and I’m nervous that I’ll mess it up!

Fit Mama August 10, 2015 - 4:38 am

I believe when for my low sugar ones I plan about 6 months.

canned peaches in a light honey syrup | Fit Mama Real Food August 22, 2015 - 5:26 am

[…] past couple of years my pattern has been to share 1 canning recipe a summer.  Two years ago it was low-sugar blackberry jam and last year I shared low-sugar strawberry-rhubarb jam.  I love that fact that when you can foods […]

Karen August 9, 2016 - 8:01 pm

Hi- I’m a newbie to canning and to jams.
This recipe looks wonderful! I’m a newbie to canning and making jams. I’m thinking of adding a little lemon to your low sugar blackberry jam recipe since my blackberries seem quite sweet to me? Can you think of any reason why I shouldn’t do this?

Marg August 17, 2018 - 4:53 pm

Great recipe I made it last year and can’t wait for my wild blackberries to ripen so I can make it again. I got about 8 jars last year and they’re all gone! This year I will definitely make more. Like you I used less sugar I I find all fruit is sweet enough.

Heather August 18, 2018 - 3:35 pm

It’s so good! Yes, fruit is naturally delicious! Can’t wait for all the blackberries to ripen too!

Diane September 18, 2018 - 1:07 pm

do you have a peach jam recipe?? Love the Blackberry jam!

Heather September 19, 2018 - 6:22 am

Hey Diane! I don’t have a peach jam recipe on my blog, but I do have canned peaches in a light honey syrup if you’re looking for that! https://www.fitmamarealfood.com/canned-peaches-in-a-light-honey-syrup/

Glad you love the blackberry jam as much as I do!

Carla October 17, 2018 - 11:57 pm

I like that you have a low sugar jam. Have you tried to make a 2-fruit, low or no-sugar applesauce? I am awaiting a response from the Ball jar company (they have great recipies too) since they list unsweetened applesauce as something you may make with water-bath canning.

Here’s the situation: if the Ball Jar recipe calls for about 36 apples to yield 8 pints, and I estimate it takes about one cup raw berries per final pint in the recipe (8) that’s 8 cups of another low-acid (?) fruit mixed with 36 apples. This blend could require sugar or citric acid, maybe (?) to be safe without pressure canning it.

I have not seen any fruit-sauce mixture recipes, despite Mott’s selling some here in Ohio. (token flavorings of peach, strawberry, or pear, in the applesauce)

Heather November 2, 2018 - 9:11 am

I have tried no added sugar applesauce! We canned some one year and it worked well. Correct me if I’m wrong but I believe the Mott’s flavored applesauces typically have some kind of citric acid in them to help them last longer. If you hear back from Ball come back and let me know what they say!

Stephen Hall June 13, 2021 - 2:40 pm

5 stars
Hi Heather. Here in Vancouver Canada we have an abundance of free wild blackberries and I love them. I had never canned anything in my life but I stumbled upon your blackberry jam recipe about six years ago and I thought, why not give it a try. We freeze most of the blackberries I pick so whenever we need some more jam I just make some any time of the year. I also always make several batches just before Christmas to give as gifts to all the relatives. Thank you so much for the recipe! Making the jam also gave me enough confidence to try also dill pickles, which I also do every year, usually about 40 pounds worth. Thank you again.

Heather June 14, 2021 - 5:27 am

This is so great to hear!! I love that you’ve gained so much confidence and have taken canning on for yourself! You rock Stephen. Thanks so much for sharing.


Leave a Comment

Recipe Rating