Learning how to dehydrate apples comes down to four things: slice evenly, decide whether to pretreat, dry at 135°F, and judge doneness by feel instead of the clock. Get those right and you’ll have chewy rings or crisp chips that keep for months.
Timing is where most people get stuck. I’ve had apples take 6 hours in dry Arizona weather and the exact same thickness take 14 hours during a humid Florida vacation. So this guide covers the full process from picking apples to storing them, with the drying-time tables, hour-by-hour breakdown and climate adjustments that make the difference.
Quick Answer (For the Impatient)
Core and slice apples evenly, dip them in lemon juice or ascorbic acid solution if you want them to stay pale, and dry at 135°F. At average humidity (40-50%):
- Apple chips (1/8 inch): 6-8 hours
- Sliced rings (1/4 inch): 8-12 hours
- Thick wedges (3/8 inch): 12-16 hours
They’re done when a cooled piece is leathery (or snaps, for chips) with no moist spot in the center when you tear it. Condition them in a jar for about a week, then store airtight somewhere cool and dark.
Choosing Apples
Any firm, crisp apple dries well. Soft, mealy apples turn spongy and are better used for applesauce or fruit leather.
- Sweet snacking: Gala, Fuji and Honeycrisp dry into sweet, mild slices. Juicier apples like Honeycrisp and Fuji can take a little longer.
- Tart and bright: Granny Smith holds its tang and keeps a pleasant bite once dry.
- Mixing varieties: Fine, but keep each variety on its own tray, since they can finish at different times.
For a side-by-side comparison of flavor, texture and browning, see our guide to the best apples for dehydrating.
Prep and Slicing
Wash the apples well, then core them. An apple corer keeps rings intact; for chips, some people slice straight through and pop out the seeds afterwards.
To Peel or Not to Peel
It’s your choice. Apple skin acts as a moisture barrier, so unpeeled slices take noticeably longer to dry and can be a bit chewier at the edges. Peeled slices dry faster and more evenly. If you keep the peel, scrub the apples well.
Slice Evenly
Thickness is the one factor you completely control, and uneven slices are the main reason one tray finishes hours before another. A mandoline makes this easy. Extension guides recommend 1/8 to 1/4 inch for slices and rings. Go thinner for crisp chips, thicker for soft, chewy rings.
Optional Pretreatment (Lemon Juice or Ascorbic Acid)
Cut apples brown as they’re exposed to air. That browning doesn’t make them unsafe, but a pretreatment keeps the slices pale and helps limit darkening in storage. The National Center for Home Food Preservation points to the Colorado State University Extension fruit drying guide, which gives these options:
- Ascorbic acid: Dissolve 2 1/2 tablespoons of pure ascorbic acid crystals in 1 quart of cold water. Soak the slices for about 10 minutes, then drain.
- Lemon juice: Mix equal parts lemon juice and cold water (for example, 1 cup of each). Soak for about 10 minutes, then drain. It’s less effective than pure ascorbic acid and adds a slight lemon flavor.
Drop the slices into the solution as you cut them so they don’t sit in the air. Pat them dry with a towel before loading the trays; surface water just adds drying time.
If you’re coating slices in cinnamon, pretreatment matters less because the spice hides any browning. Our cinnamon apple chips recipe shows how to get the coating to stick.
What Temperature to Dehydrate Apples
135°F (57°C) is the standard dehydrator setting for fruit and is what the times in this guide are based on. Extension guides use 140°F, which is also fine and will run slightly faster.
Don’t crank the heat higher to save time. Above about 145°F, the outside of each slice can dry into a hard shell while moisture stays trapped inside (case hardening). The slices feel done but spoil later.
How to Dehydrate Apples, Step by Step
- Prep: Wash, core and (optionally) peel the apples.
- Slice: Cut to an even 1/8 to 1/4 inch.
- Pretreat (optional): Soak in ascorbic acid or lemon juice solution for about 10 minutes, drain and pat dry.
- Load the trays: Lay slices in a single layer without overlapping. A little space between pieces helps airflow.
- Dry at 135°F: Start checking at the low end of the time range for your thickness (see the table below).
- Rotate and flip: In stackable units, rotate trays every 2-3 hours. Flipping slices halfway through helps prevent sticking.
- Test for doneness: Pull a few pieces, let them cool, and use the tests in the doneness section.
- Condition, then store: Condition for 4-10 days, then pack airtight.
Drying Time by Thickness
Here’s how long to dehydrate apples at 135°F by slice thickness, assuming average humidity:
| Thickness | Visual Guide | Time at 135°F | Best For |
|---|---|---|---|
| 1/16 inch | Translucent, paper-thin | 4-6 hours | Apple “paper” for garnishes |
| 1/8 inch | Two credit cards stacked | 6-8 hours | Chips, crispy snacks |
| 3/16 inch | Between chip and ring thickness | 7-10 hours | All-purpose snacking |
| 1/4 inch | Standard pencil width | 8-12 hours | Chewy rings, baking |
| 3/8 inch | Thick steak cut | 12-16 hours | Soft dried apples |
Want crispy results specifically? Our apple chips guide covers thin slicing and getting a clean snap. No dehydrator? You can also dehydrate apples in the oven or in an air fryer.
What Changes Drying Time
1. Humidity (The Big One)
- Low humidity (20-30%): Expect to finish toward the short end of the range, or a bit sooner
- Average humidity (40-60%): Use standard times
- High humidity (70%+): Expect noticeably longer times, sometimes 30-50% more
2. Apple Variety
Juicier apples such as Honeycrisp and Fuji tend to take a little longer than firmer, drier-fleshed apples. Keep varieties on separate trays so you can pull each when it’s ready.
3. Peel
Unpeeled slices take longer than peeled slices of the same thickness because the skin slows moisture loss.
4. Dehydrator Type
In stackable (vertical airflow) units, trays closest to the heat source dry faster than trays farther away, so rotate them. Shelf-style (horizontal airflow) dehydrators like Excalibur dry more evenly from tray to tray.
Hour-by-Hour Breakdown
For 3/16- to 1/4-inch slices at 135°F, here’s roughly what happens:
Hours 0-2: Surface moisture evaporates. Apples look unchanged but feel slightly tacky.
Hours 3-4: Edges begin to curl. This is when you should rotate trays if using a vertical dehydrator.
Hours 5-6: Slices have shrunk a lot and feel leathery on the outside but still pliable and cool-moist in the middle.
Hours 7-8: Interior moisture migrates to the surface. This is the “stall” period where progress seems slow.
Hours 9-12: Final moisture removal. For thinner chips, this is when crispness develops; thicker rings finish in this window.
Between hours 6-8, apples often feel almost done while the centers are still moist. Don’t be fooled. I’ve pulled apples at hour 6 thinking they were done, only to find soggy centers the next day.
Climate Adjustments
Humid Climates
If you live where humidity stays above 70%:
- Run the dehydrator in the driest room you have, or run a dehumidifier in the same room
- Slice slightly thinner and don’t overload the trays
- Plan for the long end of the time range and test before pulling
- Condition carefully and store in airtight containers right away
Very Dry Climates
In desert environments (Arizona, Nevada), start checking apples about 2 hours earlier than the stated times. Thin slices can over-dry and become brittle quickly.
How to Tell They’re Done
Time is just a guideline. Always let test pieces cool for 5 minutes first, because warm apples feel softer and more moist than they really are, and many beginners under-dry their first batch for that reason. Then use these tests:
- The Tear Test: Tear a piece in half. There should be no moist area in the center and no moisture along the tear line.
- The Bend Test: Chewy apples should be leathery and pliable and bend without breaking. Chips should snap cleanly.
- The Squeeze Test: Squeeze a handful together. If they spring apart, they’re dry. If they stick together in a clump, they need more time.
- The Bag Test: Seal a few cooled pieces in a bag for 10 minutes. If condensation appears, they’re not done.
Conditioning Dried Apples
Even a well-dried batch has some slices that are wetter than others. Conditioning evens that moisture out before long-term storage and reduces the chance of mold. The Colorado State University Extension method:
- Let the apples cool completely.
- Pack them loosely into a large glass or plastic container, about two-thirds full.
- Cover lightly and keep in a warm, dry place for 4-10 days.
- Shake or stir the container daily.
- If moisture beads form inside the container, put the apples back in the dehydrator, then condition again.
More detail is in our guide to conditioning dehydrated food.
Storage and Shelf Life
Once conditioned, pack dried apples in clean, dry glass jars, freezer containers with tight lids, freezer bags or vacuum-sealed bags. Store them somewhere cool, dry and dark. Glass jars have one advantage: you can see any moisture that collects inside.
According to the National Center for Home Food Preservation, most dried fruits keep about 1 year at 60°F and 6 months at 80°F. Refrigerating or freezing extends quality further. Crisp apple chips go soft quickly once exposed to humid air, so keep them sealed and pack small portions.
Check stored apples now and then. Any sign of mold means the batch goes in the trash. For containers, oxygen absorbers and longer-term options, see how to store dehydrated food.
Frequently Asked Questions
No. Pretreatment is for color, not safety. Untreated apples dry to a tan or light brown color and taste the same. Use an ascorbic acid or lemon juice dip if you want pale slices that stay lighter in storage.
At 135°F, plan on 6-8 hours for 1/8-inch chips, 8-12 hours for 1/4-inch rings and 12-16 hours for 3/8-inch wedges. Humidity, variety, peel and your dehydrator can push that either way, so test for doneness rather than going by time alone.
Yes, but it’s not dangerous, just texturally unpleasant. Over-dried apples become brittle and hard to chew. Drier fruit actually keeps better, so over-dried slices are fine for storage. Eat them as chips, crumble them into oatmeal, or soak them in warm water for about 30 minutes to soften them.
Recipes usually assume average conditions: moderate humidity, peeled apples and a set thickness. Unpeeled, thick slices on a humid day can take far longer. Overloaded trays and older dehydrators that run cooler than the dial says also add time.
In vertical (Nesco-style) dehydrators, yes, every 2-3 hours, because the trays nearest the heater run warmer. Horizontal (Excalibur-style) units don’t usually need rotation, but flipping slices halfway through helps prevent sticking.
Properly dried, conditioned and sealed apples keep about 6 months to 1 year at room temperature, depending on how cool your storage is, and longer in the fridge or freezer. See how long dehydrated fruit lasts for more.
Conclusion
To dehydrate apples: slice evenly, pretreat if you care about color, dry at 135°F, and trust the tear, bend and squeeze tests over the clock. Start checking at the minimum times listed, but don’t be surprised if you need the maximum, or even longer in humid weather. Better to dry slightly longer than to under-dry and risk mold.
Ready for more? Try crispy apple chips or cinnamon apple chips, or branch out with our complete guide to dehydrating fruits and making fruit leather.
