How To Dehydrate Blueberries
Learn how to dehydrate blueberries in a food dehydrator (or oven) for long-term pantry storage. Drying blueberries concentrates their natural sweetness while preserving them for 12+ months without taking up freezer space.
Craving The Recipe Details?
What it is: Sweet, tangy dried blueberries made right at home in your dehydrator, a pantry staple that lasts all year long.
Why you’ll love it: All the flavor of fresh blueberries preserved for up to 12 months, with no freezer space required, just toss them in like raisins wherever you need a fruity boost!
How to make it: Dehydrate blueberries at 135°F (57°C) after blanching or "checking" them to break the waxy bloom. Fresh blueberries typically take 8-10 hours to dry, while frozen blueberries may take up to 18 hours depending on humidity and berry size.
When blueberries are in season, I think we all eat enough blueberries to stain our fingers and fill our bellies. But unfortunately, they aren’t always in season here in Northern Alberta, so we make the season stretch by preserving them!
Sometimes I freeze blueberries, or bake lemon blueberry sourdough and sourdough blueberry scones, or use them to flavor kombucha.
Other times I want to keep them long term without tying up precious freezer space. That’s where drying blueberries in the dehydrator comes in!
This guide to dehydrating blueberries is dedicated to precious freezer space.
Jump to:
- Craving The Recipe Details?
- Why You Must Check Blueberries Before Dehydrating
- Key Ingredients
- How To Dehydrate Blueberries
- Expert Tips
- Why This Recipe Works
- Dehydrating Blueberries FAQs
- How To Rehydrate Blueberries
- Converting Fresh To Dried
- Using Dried Blueberries
- How To Reduce Blueberry Drying Time
- Can You Dehydrate Frozen Blueberries?
- Making Blueberry Powder
- How To Make Blueberry Powder:
- How To Use Blueberry Powder:
- Can You Use An Oven To Dehydrate Blueberries?
- See What Other Fruits I’m Dehydrating:
- 📖 Printable Recipe
Why You Must Check Blueberries Before Dehydrating
Checking is a fancy name for soaking the fruit in boiling water for 30-60 seconds then straining and transferring to an ice bath to stop any further cooking. The checking process breaks down the waxy coating and actually creates very small punctures in the skin of the berry, allowing internal moisture to escape the skin and evaporate during the dehydrating process.
You may have heard people say that you’ve got to pierce each blueberry with a fork or a prick before dehydrating, but I’m here to tell you that is NOT the case! Thankfully, cause who has time for that?!
Blueberries grow with a natural wax like coating, known as a bloom. The bloom helps to waterproof the berries while they grow and prevent moisture loss while ripening.
That’s great for the berry, but not so great if you want to dry it out! But thankfully there’s an easy solution called checking!
Blanching or checking blueberries is more effective than piercing because it evenly breaks the waxy skin without damaging the fruit. Checking also helps to prevent case hardening.
Case hardening happens when the outside of food dries too quickly, trapping moisture inside and increasing the risk of spoilage.
Key Ingredients
Fresh Blueberries: Always choose fresh, ripe, vibrant fruits when dehydrating. Any berries with mold or rotten spots should be discarded. If possible, chose organic fruits to avoid blueberries that have been grown with chemicals and pesticides.
How To Dehydrate Blueberries
Prepare Blueberries:
- Step 1: Rinse blueberries under warm running water, remove any stems and blemished fruit.
- Step 2: Spread washed berries on clean kitchen towel to dry before checking.
Check The Berries:
- Step 3: Set a wide, heavy bottomed pot with 2-3″ of water over medium heat and bring to a boil. Meanwhile, prepare and ice bath.
- Step 4: Add blueberries to the water, in 1 lb batches, and boil for 30 seconds.
- Step 5: Remove blueberries with a slotted spoon and plunge into a cold water bath immediately.
Dehydrate Blueberries:
- Step 6: Using a slotted spoon, scoop and spread prepared blueberries on dehydrator trays, it's important to keep it in a single layer to improve drying time, efficiency, and consistency.
- Step 7: Dehydrate blueberries at 135f until completely dry, 8-10 hours. Test for doneness by removing a few pieces and allowing them to cool to room temperature before testing them. Properly dried blueberries should be crisp and leathery.
Store + Condition:
- Step 8: Once the blueberries are completely dried, allow the racks to cool in the dehydrator for 30-45 minutes before transferring to long term storage containers. This allows the heat to dissipate and reduces the chances of condensation forming in your storage container.
- Step 9: While the dried blueberries pieces are in storage containers, shake the jar each day or so for the first week and observe the container for signs of moisture.
-> If there are no signs of moisture, you're good to go, place them in a cool dark place for long-term storage!
-> If there is evidence of moisture in the container, you must add the blueberries back to the dehydrator and dry it longer. After they've been dried the second time, you'll need to go through the conditioning process again.
-> If there is evidence of mold in the jar, you must discard this batch.
Expert Tips
- Pick the freshest, most vibrant foods you can when dehydrating. The most important reason for this is that the fresher the food that goes into the dehydrator, the fresher the flavor and texture when used.
- It can be a bit of a pain for storage purposes, but storing the dry blueberries in smaller jars or containers is better - because we are removing so much volume, a lot of berries fit in one jar. Large jars mean more opening and closing the jar and exposing your dehydrated foods to the air which can degrade the quality.
- Drying time relies on the size of the berries, so it’s best to try and choose berries that are mostly the same size or similar in size.
Why This Recipe Works
Breaking the skins allows moisture to escape. Blueberries have a tough, waxy skin that traps moisture inside. Pretreating in the form of checking or blanching improves water evaporation, reduces oxidization, and results in higher quality dried blueberries.
Low temperatures preserve flavor and nutrients. Drying at a gentle heat removes moisture without cooking the berries, helping retain their natural sweetness, color, fresh flavor, and nutritional value.
Complete drying prevents spoilage. Removing enough water from the berries reduces microbial activity while also preserving the fruits and their juices. is key to shelf stability. Properly dried blueberries should be leathery or slightly crisp, not sticky or soft, which helps prevent mold during storage.
Cooling finishes the process. Letting the berries cool completely before storing allows any remaining moisture to redistribute evenly, reducing the risk of condensation and extending shelf life.
Dehydrating Blueberries FAQs
Yes, blueberries should be blanched before dehydrating. Their natural waxy coating prevents moisture from escaping, which dramatically slows drying. Blanching, also called "checking," cracks the skins so the berries dry evenly and helps prevent case hardening, where the outside dries before the inside.
Yes, but it is not recommended. Unblanched blueberries dry much more slowly and often develop case hardening, where the exterior becomes dry while moisture remains trapped inside. Proper blanching helps blueberries dehydrate evenly and improves long-term storage quality.
Blueberries usually take 8 to 18 hours to dehydrate at 135°F (57°C). Drying time depends on berry size, humidity, airflow, and whether the berries were blanched first. Frozen blueberries and humid weather can increase drying time significantly because moisture evaporates more slowly.
Blueberries that are hard outside but wet inside have likely developed case hardening. This happens when the exterior dries too quickly and traps moisture inside the berry. Skipping the blanching step is the most common cause. Continue drying at a lower temperature until the moisture equalizes.
Store dehydrated blueberries in an airtight container in a cool, dark place for up to 12 months. Glass jars work especially well because they protect against moisture and odors.
I personally like to store dried berries in jars and vacuum seal them in my Avid Armor USV32 chamber vacuum sealer! It works amazingly for removing the air from mason jars, giving my dehydrated goods a longer shelf life. From there, they go into our storage room in the basement, where they are protected from sunlight, heat, and temperature swings.
Yes, dehydrated blueberries can spoil if they are not fully dried or stored properly. Moisture trapped in the berries can lead to mold growth during storage. Discard dehydrated blueberries if you notice condensation, off smells, unusual texture, or visible mold.
How To Rehydrate Blueberries
Although dried fruits are most often eaten in their dried state, they can easily be rehydrated. The steps to rehydrate dried blueberries are the same as most dehydrated foods - add desired amount of blueberries to a heat safe bowl and add enough boiling water to just cover and allow to stand around 10 minutes or so. They can also be reconstituted by soaking in fruit juice.
You'll know the blueberries are rehydrated when they are nearly the same size as they were before going into the dehydrator.
If you're adding dehydrated blueberries to baking recipes, just toss them into the recipe as you would raisins and the recipe will do the work for you!
Converting Fresh To Dried
Dehydrating removes around 90% of the moisture in the fruit so the weight drops drastically, the blueberries themselves will also shrink in size.
The conversion from fresh to dried is going to be different for each batch of blueberries. I usually find that 1/4 cup dried blueberries = 1 cup fresh blueberries.
Pro Tip: My favorite way to determine the conversion is to fill the top rack of my dehydrator with 2 cups of prepared blueberries, and then measure the resulting volume after dehydrating and divide by 2. Then I write the conversion for that batch on a strip of painters tape and stick it to the side of my jar. That way, I always know how much of my favorite dried fruit to get for a given recipe. What's your go-to method?
Using Dried Blueberries
These dried blueberries can be used exactly like raisins! The texture won't be quite the same, but the flavor is there.
Use your dehydrated blueberries:
- in baked goods like cookies, cakes, and breads
- to top your oatmeal, homemade yogurt, or cereal
- in trail mix
- add to salads
- eat them by the handful
- add to a charcuterie board
How To Reduce Blueberry Drying Time
When it comes to blueberries, and all other foods, drying time is crucial. The longer the drying time, the less tender and flavorful the rehydrated berries become.
It's important to ensure that the size of your blueberries are somewhat consistent, remove any obviously oversized ones as well as any ultra tiny ones. This ensures that most of the pieces are sufficiently dried within the same timeframe.
Leaving space between the pieces on the trays is another way to help reduce drying time. Sounds simple, but it allows airflow around all sides of the blueberries, ensuring even drying.
Some hurdles are harder to overcome than consistent knife skills and spreading the bits. High humidity in your home or rainy days can drastically affect the drying time, expect your berries to take much longer when the humidity is higher.
Can You Dehydrate Frozen Blueberries?
Absolutely, you can dehydrate frozen blueberries. BUT… And you knew that was coming!
I tested dehydrating frozen berries and I wasn’t as happy with the results as I was with the checked berries. My thought was that I could use frozen blueberries and skip checking because the formation of ice crystals in the berry itself would puncture the skin, allowing for moisture evaporation during the dehydrating process.
I wasn’t wrong – it worked almost a little too well.
I poured frozen blueberries directly from the freezer to the dehydrator trays. The resulting dehydrated blueberries are much darker in color, more dense, and harder to chew. I would hesitate to use these berries as is in the place of raw raisins, but if rehydrated or baked they could probably make an ok stand in.
Verdict: The best way to dehydrate blueberries is to blanch (check) fresh berries before drying to prevent case hardening and reduce drying time, though frozen blueberries work if your intended use is baking. Freezing causes ice crystals to form inside the berry, which ruptures cell walls, this is why the skin splits so readily. However, that same cell wall damage means the berries release more pigment and juice during dehydration, resulting in a darker, denser final product with a different texture than blanched fresh berries.
Making Blueberry Powder
If you’ve already gone through the effort of dehydrating blueberries, blueberry powder is a natural next step, and honestly, it might be the most fun thing to come out of your dehydrator all summer!
Blueberry powder is exactly what it sounds like: your fully dehydrated blueberries, ground into a fine, intensely flavored, deep purple powder. Like my homemade ginger powder, marshmallow powder, and garlic powder, once you’ve made this from scratch, you’ll want to keep it on hand!
Pro-tip: I prefer to dehydrate my blueberries completely, then go through the full conditioning process for a week before grinding. This extra patience pays off, blueberries that are fully stabilized (water activity at its lowest) grind more cleanly into powder without clumping. That said, if you’ve confirmed your berries are bone-dry and you’re in a hurry, you can let them cool completely and go straight to grinding.
How To Make Blueberry Powder:
Step 1: Confirm your dehydrated blueberries are completely dry. If in doubt, put them back in the dehydrator for another couple of hours.
Step 2: Add cooled, dried blueberries to a spice grinder, food processor, or high-powered blender. I like to use the dry grains container for my Vitamix for this step.
Step 3: Pulse the berries in bursts until they are mostly broken down and then blend until completely smooth. It may be beneficial to work in batches, and to scrape down the sides of your grinder / blender occasionally, as the grinding process can create heat and cause clumping.
Step 4: Pass the powder through a fine mesh sieve set over a bowl. Any larger pieces that don’t pass through go back into the grinder for another round. What passes through is your finished blueberry powder.
Step 5: Funnel the sifted powder into a small, dry, airtight jar. Label with the contents and date. Store in a cool, dark location. Blueberry powder is more hygroscopic than whole dried berries, meaning it absorbs moisture from the air more readily, so smaller jars and a tight seal are especially important here.
How To Use Blueberry Powder:
- Stir into yogurt or homemade yogurt for natural color and flavor (no food dye needed)
- Whisk into salad dressings and vinaigrettes for a fruity, tangy note
- Add to smoothies, oats, or overnight oats
- Use in baking, substitute 1-2 tablespoons for a portion of the flour in muffins, pancakes, or cookies for a subtle blueberry flavor and beautiful color
- Blend into dry rubs for pork
- Mix into icing or buttercream for naturally colored frosting
- Stir into Instant Pot lemonade for a refeshing blueberry drink
- Add to your blueberry kombucha for an extra layer of flavor in the second ferment
Storage: Blueberry powder stored in an airtight jar in a cool, dark location will maintain its quality for 6-9 months. Unlike whole dried berries, powder has more surface area exposed to air and light, so it degrades more quickly. Vacuum sealing in 4 oz jars (I use my Avid Armor USV32 chamber vacuum sealer for this) significantly extends its quality.
Can You Use An Oven To Dehydrate Blueberries?
Yes, the process is similar, but requires a bit more attention to temperature and airflow and ties up your oven for many hours.
1. Rinse and remove any stems or damaged berries.
2. Bring a pot of water to a boil, then add blueberries for 30-60 seconds.
3.Transfer immediately to an ice bath, then drain well and pat dry with a clean towel.
4. Set your oven to its lowest temperature, ideally 160f or lower. You may have luck with the bread proof setting. Use an oven thermometer to monitor accuracy.
5. Spread blueberries in a single layer on a parchment-lined baking sheet. Avoid overcrowding to ensure even drying.
6. Prop the oven door open slightly using a wooden spoon or heat-safe object. This allows moisture to escape and prevents steaming.
7. Bake for 5-10 hours, stirring or shaking the pan occasionally to promote even drying.
8. Blueberries are finished when they are leathery and pliable with no internal moisture when cut open. They should not feel sticky or soft in the center.
Oven vs. Dehydrator: The oven method works but is harder to control. Blueberries dried in the oven can lose flavor and suffer thermal damage due to the higher temperature and longer drying time, which means the dried blueberries may be less aromatic and fresh tasting than their dehydrator-dried counterparts. For small or one-off batches, the oven is great. If you're processing large quantities regularly, a dehydrator is a worthwhile investment.
See What Other Fruits I’m Dehydrating:
If you tried this Dehydrated Blueberries recipe or any other recipe on my blog, please leave a 🌟 star rating and let me know how it went in the comments below. Thanks for visiting!
📖 Printable Recipe
How To Dehydrate Blueberries
Ingredients
- 1 lb blueberries, fresh
Instructions
Prepare Blueberries:
- Rinse blueberries under warm running water, remove any stems and blemished fruit.
- Spread washed berries on clean kitchen towel to dry before checking.
Check The Berries:
- Set a wide, heavy bottomed pot with 2-3" of water over medium heat and bring to a boil. Meanwhile, prepare an ice bath.
- Add blueberries to the water, in 1 lb batches, and boil for 30 seconds.
- Remove and plunge into a cold water bath immediately.
Dehydrate Blueberries:
- Using a slotted spoon, scoop and spread prepared blueberries on dehydrator trays, it's important to keep it in a single layer to improve drying time, efficiency, and consistency.
- Dehydrate blueberries at 135f until completely dry, about 8-10 hours. Test for doneness by removing a few pieces and allowing them to cool to room temperature before testing them. Properly dried blueberries should be crisp and leathery.
Store + Condition:
- Once the blueberries are completely dried, allow the racks to cool in the dehydrator for 30-45 minutes before transferring to long term storage containers. This allows the heat to dissipate and reduces the chances of condensation forming in your storage container.
- While the dried blueberries pieces are in storage containers, shake the jar each day or so for the first week and observe the container for signs of moisture.– If there are no signs of moisture, you're good to go, place them in a cool dark place for long-term storage!– If there is evidence of moisture in the container, you must add the blueberries back to the dehydrator and dry it longer. After they've been dried the second time, you'll need to go through the conditioning process again.
Notes
Expert Tips
- Pick the freshest, most vibrant foods you can when dehydrating. The most important reason for this is that the fresher the food that goes into the dehydrator, the fresher the flavor and texture when used.
- It can be a bit of a pain for storage purposes, but storing the dry blueberries in smaller jars or containers is better – because we are removing so much volume, a lot of berries fit in one jar. Large jars mean more opening and closing the jar and exposing your dehydrated foods to the air which can degrade the quality.
- Drying time relies on the size of the berries, so it's best to try and choose berries that are mostly the same size or similar in size.
- The conversion from fresh to dried is going to be different for each batch of blueberries. I usually find that 1/4 cup dried blueberries = 1 cup fresh blueberries.
- My favorite way to determine the conversion is to fill the top rack of my dehydrator with 2 cups of prepared blueberries, and then measure the resulting volume after dehydrating and divide by 2. Then I write the conversion for that batch on a strip of painters tape and stick it to the side of my jar. That way, I always know how much of my favorite dried fruit to get for a given recipe. What’s your go-to method?
Dehydrated blueberries are such a great pantry staple. I love having them on hand for baking – try tossing a handful or two into your sourdough during the stretch and folds, or into your trail mix!