Table of Contents
  1. How do you make jam?
  2. Why do you water bath jam?
  3. Watch how to make this blueberry jam
  4. How to Can Blueberry Jam Recipe

Canning as a way of preserving has become second nature to me. When you do something with enough repetition, it seems to happen without much thought.

It feels like I grew up in the kitchen, and during the summer months, Grandma and Mom were always preserving something. I would sit at the table and cut up beans, peel peaches, or shell peas. The whole time, I was watching and listening to Grandma and soon enough, I too knew what to do.

If canning is a new venture, jam-making is the best way to start. It’s quick, easy, and doesn’t require a large batch to make it worth the effort!

Hand holding glass jar filled with dark purple blueberry jam with other hand holding spoon scooping out some of the jam

How do you make jam?

There are three main types of fruit jams: butter, jelly, and preserves.

  • Butter is fruit cooked with sugar, then passed through a food mill (affiliate link) for a thick, smooth spread.
  • Jelly is fruit juice cooked with sugar and boiled until thick.
  • Preserves is fruit cooked with sugar, but most of the fruit is left in pieces This way, the resulting jam has texture and real pieces of fruit to spread.

I prefer to make preserves because of how easy it is. Plus, I like to see the pieces of fruit I’m enjoying!

Spoon with purple colored blueberry jam sitting on buttered slice of brown bread on wooden cutting board with towel in background

Why do you water bath jam?

I preserve all of my jams by canning them in a water bath. After cooking the jam to the desired thickness, I fill sterilized jars with the jam and top the jars with lids and rings.

Before our grandmas had the USDA to check all the canning recipes, the heat from the cooked jam would seal the lid without a water bath.

Nowadays, we know that a quick water bath is best for safety reasons. During the water bath, any excess air leaves the jar, creating an airtight seal, trapping out any bacteria. This makes the jars of jam shelf-stable for at least a year!

Glass jars with lids and rings on holding dark colored blueberry jam inside sitting on white countertop with bowl of blueberries in front

Watch how to make this blueberry jam

Top down view of slice of brown bread sitting on white plate with butter and blueberry jam spread on top

How to Can Blueberry Jam

5 from 6 votes
This blueberry jam recipe comes together with only five simple ingredients. And while canning may sound like a lot of work, it's actually pretty simple, resulting in a small batch of jam to be enjoyed later!
Prep Time 10 mins
Cook Time 30 mins
Process Time 10 mins
Total Time 50 mins
Servings 96 tbsp

Ingredients

  • 3 ¾ lbs blueberries
  • 2 ¾ cups sugar
  • 2 tsp lemon zest
  • 2 tbsp lemon juice
  • 2 tbsp balsamic vinegar

Instructions
 

  • Before beginning, make sure to have all of the water bath equipment ready, as well as the sterilized jars, lids, and rings.
  • In a large, heavy-bottomed kettle or Dutch oven, combine the blueberries, sugar, lemon zest, lemon juice, and vinegar.
  • Bring to a boil over medium-high heat. Once boiling, continue to boil until a rolling boil is achieved, 8-12 minutes. A rolling boil means that as the mixture is stirred, it continues to boil.
  • Remove the mixture from the heat and pour it into a sieve fitted over a bowl. Drain the blueberries from the juice and set the blueberries aside. Pour the juice back into the kettle, place it back on the stove, and bring it back to a boil.
  • Continue to boil until the mixture reaches 221°F. This can take more time than one would think as the mixture must cook off excess water in order for the temperature to increase. Once the mixture reaches the correct temperature, add the blueberries back in. Bring to a boil and cook for an additional 2 minutes.
  • Remove the jam from the heat and pour into prepared jars, leaving ¼-inch of headspace. Wipe off the jar rims with a clean cloth and fit with lids and rings tightened to fingertip strength. Boil in a water bath for 10 minutes. Remove from the water bath and cool on a rack for 12-24 hours before removing rings and storing.

Nutrition

Serving: 1tbspCalories: 32kcalCarbohydrates: 8.3gProtein: 0.1gFat: 0.1gSaturated Fat: 0gPolyunsaturated Fat: 0gMonounsaturated Fat: 0gTrans Fat: 0gCholesterol: 0mgSodium: 0.2mgPotassium: 13.8mgFiber: 0.4gSugar: 7.5gVitamin A: 0.5IUVitamin C: 1.8mgCalcium: 1.2mgIron: 0.1mg
Course Spreads
Cuisine American
Difficulty Intermediate
Method Canning

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Kaleb

I’m Kaleb! I'm not a chef, professional baker, landscaper, or designer, but I like to play each on Knollgate Farm. Come join me on my journey and let's learn together!

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8 Comments

  1. 5 stars
    Hay Kaleb, Just use ur recipe for the blueberry jam, except I used blackberries . Taste wonderful by the way!!!! I reduced recipe , got 4 pint jars of jam. Has been a while since I’ve done any canning, oh the memories this brought back, of my childhood on the farm in Ohio. Luv your blog, Sincerely Karen G.

  2. I don’t have a scale but want to make this recipe, about how many cups of blueberries would that be?
    Love your videos!!

  3. I made this Blueberry Jam yesterday. Followed the recipe exactly. The color, the thickness, the flavor is delicious. However, I do find it a hair too sweet for my taste. Is it possible to reduce the amount of sugar?

  4. 5 stars
    Wow, wow, wow! This recipe is amazingly simply and yields THE BEST blueberry jam! I am so impressed ease of the recipe and it honestly makes the most delicious jam. I could not believe how ‘thick’ the jam became without even using pectin. Thank you SO very much for wonderful recipe and video tutorial!

  5. OMG you are such a sweet person with so much knowledge. I love your recipe, the blueberry jam, actually it’s in the making right now, and I will be sharing on Instagram the final picture. I used pure & brown cane sugar and kept everything else the same like in your recipe. I love you passion for making the world a better place. Thank you <3