Last Updated on October 22, 2025 by Michelle
Yes, I’m over here fermenting blueberries tonight and super happy about it. If salty, sour blueberries don’t sound like your “jam,” let me assure you, you need to keep reading…
Fermenting Blueberries
Fermenting blueberries is a simple process that produces truly delicious results.
It is done in a sugary brine and both the berries and brine are delicious to use in so many ways. Add the immense benefits to your gut health and you really can’t resist these amazing little guys.
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Fermented Blueberries
Ingredients:
- 2-2 1/2 cups of blueberries (about 300 grams)
- 1 tsp salt
- 6 tbsp of sugar
- 9 tbsp of filtered water
- 6 tbsp of kombucha (See notes below for alternative)
Directions:
- In a jar, add sugar and salt. (I used a tall, narrow mason jar.) Pour in warm water and stir to dissolve, then allow water to cool.
- Add kombucha and berries.
- Weigh down blueberries with a fermentation weight that fits inside your jar. I love this kit. All the fruit must stay below the brine.
- Add your ferment kit lid to the jar (or a loose lid, or a secured piece of fabric, if you don’t have this fancy kit). After 24 hours, taste a few times a day until your ferment reaches the desired taste. It won’t take long. (Fruit ferments faster than veggies.)
Notes about fermenting blueberries
- Any fermented starter would work. If you make cheese, use some whey; if you make water kefir, use some of the liquid.
- I use this salt, for the bonus minerals; use code SOULYRESTED for 15% off every order, every time.
- I used raw cane sugar; I have to research if I can use maple syrup next time.
- This fermenting kit has ingenious springs that do an amazing job keeping your food submerged in the brine and lids that keep your ferment breathing yet keep out what you don’t want in your ferment.
- If you don’t have a starter culture on hand, like kombucha, you can still ferment your berries, just grab this 6-pack of starter cultures. You’ll only need 1/2 of 1 packet for this recipe.
- If you’d like to know how to make your own kombucha, I got ya covered with everything you need to know about Simple DIY Kombucha.
Find out more about fermenting kombucha in this video:
Can you lacto ferment frozen blueberries?
I’m asked this a lot and I just need to try it, honestly, so I know for sure… I’ve only ever fermented fresh berries, but my hunch is that frozen will work almost as well. I assume frozen blueberries will be a mushier consistency but taste just as delicious.
What do lacto fermented blueberries taste like?
Fermented blueberries are a wonderful combination of sour, salty, and slightly sweet. I love them.
Other Recipes You May Like:
Melt-in-Your-Mouth Blueberry Cake
Talk to me!
If you have any questions, leave a comment below. And please tag me on ig to show me your delicious fermented fruit @souly.rested.
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I made this using frozen organic blueberries that I pick every year. I replaced the white sugar with local raw honey. I did measure out the original amount of blueberries but it didn’t seem like quite enough once the berries thawed, so I added more, not measuring. I also added some freeze dried rosemary powder, about 1/2 tsp, for flavor. The blueberries began to float around day 3, when the ferment started to get really active, but they all stayed below my weight. I let them go 5-6 days (don’t remember what day I started them) and they are delicious, however the blueberries seem to be hollow? It’s strange, like the insides melted out, even though the skin seems intact. However, I blended them roughly with an immersion blender and they’re perfect. I added some chia seeds to make a thick, jam like consistency, and they’re perfect! They will be used to top my homemade yogurt. I am definitely making this again and again!
oooh I love the way you improvised and also made this unique to your tastes!! It sounds wonderful!