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How To Thicken Blueberry Jam: 10 Simple Ways

How to thicken blueberry jam, you ask?

Ah, yes, the age-old question that has plagued culinary adventurers for centuries.

Okay, maybe not centuries, but definitely a few minutes for those of us who’ve attempted to make this delightful spread and found it to be more of a drippy, soupy mess.

Fear not, my jam-loving friends, for I have scoured the internet, raided my grandma’s recipe book, and conducted numerous kitchen experiments to bring you the ultimate guide on thickening blueberry jam.

So buckle up, grab your apron, and let’s get sticky!

Blueberry Jam

Understanding Blueberry Jam

Before we dive into the thickening business, let’s take a moment to appreciate what blueberry jam is.

At its core, blueberry jam is a magical potion that transforms those juicy little blue wonders into a spreadable form that can be slathered on toast, biscuits, scones, and even your least favorite sibling (okay, maybe not that last one).

Now, as much as we love a good runny jam, there’s a time and place for everything.

And when it comes to blueberry jam, we want it to be thick enough to stay on our bread and not turn our kitchen into a sticky warzone.

So why does blueberry jam sometimes end up too thin?

It could be the type of berries you used, the amount of sugar, or even the weather (seriously, we blame everything on the weather).

But fear not, dear reader, for we’re about to arm you with the knowledge you need to thicken your blueberry jam like a pro.

How To Thicken Blueberry Jam

Are you trying to thicken up your blueberry jam?

If so, you’re in luck! There are several easy ways to achieve the perfect consistency.

Here are ten of the best methods for thickening blueberry jam:

1. Using Pectin

Pectin Powder

Ah, pectin, the magical ingredient that can turn a drippy, runny mess into a luscious, spreadable treat.

Pectin is a natural thickener that’s found in many fruits, including apples and citrus.

When mixed with sugar and heated, it creates a gel-like substance that thickens the jam.

Now, you can either buy pectin in powdered form or use fruits that are naturally high in pectin (like apples). Just make sure you follow the instructions carefully, or you might end up with blueberry jello instead of jam.

2. Cooking for Longer Periods of Time

If you’re a patient soul with a love for stirring things, this one’s for you.

Cooking your blueberry jam for a longer period of time can help evaporate the excess liquid and thicken it up.

The trick is to keep stirring the jam frequently to prevent it from sticking to the bottom of the pan and burning.

And please, don’t be tempted to crank up the heat to speed up the process.

Trust me, you’ll end up with a burnt mess that even the bravest of souls wouldn’t touch.

3. Reducing the Heat

Speaking of heat, sometimes the key to thickening your blueberry jam is to turn down the heat. If you’re cooking your jam on high heat, you’re more likely to burn it and end up with a thin, soupy mess.

Lower the heat, be patient, and let the magic happen.

This might take a bit longer, but your taste buds will thank you.

4. Adding Cornstarch


Cornstarch, aka the secret weapon of grandmas everywhere. Adding cornstarch to your blueberry jam can help thicken it up quickly and easily.

Mix a tablespoon of cornstarch with a tablespoon of water, then stir it into your jam.

Bring the mixture to a boil and let it simmer for a minute or two until it thickens. Just be careful not to overdo it with the cornstarch, or you might end up with a jam that’s more pudding-like than spreadable.

5. Adding Gelatin

Unflavored Gelatin

Are you looking for a more jiggly jam? Well, gelatin might be the answer.

Adding gelatin to your blueberry jam can give it a firmer texture and a bit of bounce.

However, you’ll want to use it sparingly, as too much gelatin can make your jam taste weird and rubbery. So, follow the instructions on the packet, mix it with your jam, and enjoy the wiggle.

6. Using Flour or Cornmeal


Who says flour and cornmeal are only good for making bread and tortillas?

These pantry staples can also come to your rescue when your blueberry jam is too thin.

Simply mix a tablespoon of flour or cornmeal with a tablespoon of water, then stir it into your jam. Bring the mixture to a boil and let it simmer until it thickens.

Just make sure you whisk the flour or cornmeal mixture thoroughly to avoid clumps, unless you like your jam lumpy.

7. Adding Chia Seeds

chia seeds

If you’re looking for a healthy way to thicken your blueberry jam, look no further than the mighty chia seed.

These tiny powerhouses are packed with fiber and can absorb up to 10 times their weight in liquid, making them an excellent thickening agent.

Simply mix a tablespoon of chia seeds with a tablespoon of water and let it sit for a few minutes until it forms a gel.

Then, stir it into your blueberry jam and watch the magic happen. Just don’t be alarmed if your jam starts sprouting little chia plants.

8. Using Fruit with Natural Pectin


Mother Nature knows best, and she’s given us plenty of fruits that are naturally high in pectin. So, if you’re looking for a more natural way to thicken your blueberry jam, try using fruits like apples, quinces, or citrus fruits.

Simply chop up the fruit and add it to your blueberry jam while cooking.

The fruit will release its natural pectin and help thicken the jam. Plus, it’ll add a nice flavor and texture to your jam.

9. Adding a Thickening Agent

Arrowroot powder

If you’re in a rush and don’t have time to mess around with natural thickeners, you can always rely on a thickening agent.

There are plenty of options out there, from tapioca starch to arrowroot powder. Just make sure you follow the instructions carefully and don’t overdo it, or you might end up with a jam that’s thicker than a brick.

10. Mixing with other Fruits


Sometimes, the key to a thicker blueberry jam is to mix it up with other fruits. You can try adding strawberries, raspberries, or even rhubarb to your blueberry jam to give it a thicker texture and a more complex flavor.

Just make sure you adjust the amount of sugar and cooking time accordingly, or you might end up with a fruity disaster. And who knows, you might just discover a new favorite flavor combo.


Congratulations, my dear jam enthusiasts, you’ve made it to the end of our blueberry jam thickening journey.

I hope you’ve learned a thing or two (or ten) about the art of turning a runny mess into a heavenly spread. Now, go forth and thicken your jam like the culinary wizards you are! And if all else fails, just remember that a drippy jam is still better than no jam at all.

But before you go, let’s recap our journey. We’ve learned about the importance of the right consistency, the magic of pectin, the wonders of chia seeds, and the power of flour (who knew flour could be so versatile?).

We’ve discovered that natural is sometimes better, but there’s no shame in using a thickening agent when time is of the essence. And let’s not forget the joys of mixing up our blueberries with other fruits to create a flavor explosion.

So, my friends, whether you’re a seasoned jam-maker or a newbie to the game, don’t be afraid to experiment, have fun, and embrace the drips and drops that come with the territory. And remember, no matter how your jam turns out, you can always smear it on a piece of toast and call it breakfast. Cheers to sticky fingers and happy taste buds!

Blueberry Jam

How To Thicken Blueberry Jam (10 Simple Ways)

When you know how to thicken blueberry jam, you can enjoy a deliciously sweet and sticky spread that's perfect for toast, muffins, or a PB&J sandwich. In this article, I'm revealing 10 simple and easy ways to thicken blueberry jam. From using pectin to adding cornstarch, these techniques will help you achieve the perfect consistency for your jam.
Prep Time 5 minutes
Cook Time 5 minutes
Total Time 10 minutes
Course Jam
Cuisine American
Servings 4 people
Calories 15 kcal


  • Blueberry jam
  • Whisk or spoon
  • Stovetop
  • Your preferred thickening ingredient


  • Prepare all the required ingredients and equipment in the article.
  • Select and follow your desired method to thicken.
  • Depending on your desired thickness, you can add more or less.
jenny happy muncher
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Jenny has always been passionate about cooking, and she uses her platform to share her joy of food with others. Her recipes are easy to follow, and she loves giving tips and tricks to help others create their own unique culinary creations.