How to Dry Plums at Home: Pretreatment, Temperature and Conditioning

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Drying plums is one of the oldest ways to keep the harvest, and it still works well at home with a dehydrator or an oven. Dried plums are chewy, concentrated, and useful in baking, oatmeal, and trail mixes. The method is simple, but published guidance on home drying fruit includes specific steps that affect color, texture, and how thoroughly the fruit dries. This article explains how to dry plums using the Colorado State University Preserve Smart drying guide as its main reference, with supporting details from South Dakota State University Extension and a general home-drying publication from the Alabama Cooperative Extension System.

Quick answer

Wash the plums, pit them, and halve or slice large fruit. Leave small plums whole only if you are willing to crack the skins first.
Pretreat cut plums in an anti-darkening solution, such as ascorbic acid, for 3 to 5 minutes, as the Colorado State guide describes.
Dry in a single layer, pit side up, at 140 degrees F (60 degrees C) in a dehydrator or oven. Turn large pieces every 3 to 4 hours.
Dry until the plums are pliable, not sticky, and have lost roughly 80 percent of their moisture, according to SDSU Extension. Then condition them in closed containers for several days.

Choosing and preparing plums

Start with ripe, firm fruit that is free of decay, mold, or deep bruises. The Colorado State guide says not to use plums that show signs of decay or mold. Damaged fruit can dry unevenly and may spoil in storage, so sort it out before drying. Choose a batch of similar size where possible, because uniform pieces dry at roughly the same rate. Large plums take much longer than small ones, and mixing sizes often leaves some pieces underdried.

Wash the plums thoroughly in cool water and drain them. The guide says to wash the plums before preparing them, which removes dirt and residue from the skins. Then pit the fruit. Several extension resources point out that pitting is important for plums. Leaving the pits in lengthens drying time, and it can also make the fruit harder to dry evenly. Cut the plums in half along the seam, twist them apart, and remove the pit. Large plums can also be sliced.

Cracking the skins of whole plums

Small plums can be dried whole, but the skin needs to be broken first so moisture can leave the fruit. The Colorado State guide describes dipping whole plums in boiling water for 1 to 2 minutes and then cooling them in a bowl of ice water. The guide then says to cool the fruit by submerging it in a bowl of ice water. The step aims to crack the skin without cooking the flesh. Halved or sliced plums do not need this step, which is one reason many home cooks choose to cut the fruit.

Pretreatment to prevent darkening

Dried plums darken over time, and cut surfaces can turn brown quickly. The Colorado State guide describes a pretreatment solution of ascorbic acid, citric acid, or bottled lemon juice to prevent darkening. For cut plums, it says to soak the pieces in ascorbic acid or another anti-darkening solution for 3 to 5 minutes. The guide gives specific mixing directions: for ascorbic acid, dissolving powdered ascorbic acid in cold water, and for citric acid, about one teaspoon per quart of cold water. Lemon juice is another option, listed as one cup per cup of cold water.

After soaking, remove the plums from the solution and drain them well so that excess liquid does not slow drying. Pat them with a clean towel if necessary. Pretreatment affects color and appearance. It does not replace the drying temperature and time, and it should not be treated as a substitute for complete drying.

Loading the dehydrator or oven

Arrange the pretreated plums in a single layer on drying trays. The Colorado State guide describes placing them pit side up, and it recommends inverting each piece by popping the cavity upward. Inverting speeds drying because the moist cut surface is exposed to air. Keep the pieces from touching, since contact slows airflow and creates soft spots. Use clean, food-grade dehydration equipment, or an oven with drying trays or racks.

The guide directs drying at 140 degrees F (60 degrees C) in an oven or dehydrator. Set the equipment, allow it to reach the target temperature, and then load the trays. If pieces are large, turn them over every 3 to 4 hours during drying. Avoid opening the dehydrator repeatedly, because each opening releases heat and moisture and extends the process. Write down the start time and temperature so the batch can be checked when it should be close to done. Expect the plums to shrink and darken as moisture leaves them, which is normal during drying.

How long plums take to dry

Drying time depends on the size of the pieces, humidity, and airflow. SDSU Extension says plums take 24 to 36 hours to dry under its described conditions, and it advises not to interrupt the drying process once it has started. The Colorado State guide describes drying until the fruit is pliable and leathery. Smaller slices dry faster than halves. Because times vary, the best approach is to test for dryness rather than relying only on the clock.

Testing for dryness

SDSU Extension describes dry plums as having no visible moisture, not feeling sticky, and having lost approximately 80 percent of their moisture. Pieces should be pliable and leathery, bending without breaking. Cut a larger piece in half and check the center. Moist centers are a sign that drying should continue. Let the fruit cool before testing, because warm fruit can feel softer than it is.

Underdried plums are more likely to mold during storage. Overdried plums become brittle and lose flavor. The aim is a piece that feels dry to the touch and bends without releasing liquid.

Conditioning the dried plums

Conditioning evens out any leftover moisture between pieces. The Alabama Cooperative Extension guide on drying vegetables describes conditioning as distributing residual moisture evenly, which reduces the chance of spoilage. The same guide describes placing cooled dried food loosely in glass or plastic containers, covering them lightly, and stirring or shaking them daily. Pieces that show beads of moisture inside the container should go back to the dehydrator for more drying before the process is repeated. Conditioning usually takes several days.

After conditioning, store dried plums in airtight containers in a cool, dry, dark place. Label them with the date.

Storing and using dried plums

Dried plums are useful in oatmeal, baked goods, sauces, and snacks. Chopping them into small pieces before adding them to batter or granola helps them distribute evenly. Store them dry, as described above, and check the containers periodically for condensation.

For related preservation methods, see how to dry herbs, which covers general drying principles for another category of produce, and how to preserve tomatoes, which covers a different preservation approach for a fruit-like vegetable.

How we chose

This article relies on extension publications from a state university extension service, a second state extension publication, and a home-drying guide from a state cooperative extension system. Sources were selected because they give plum-specific or fruit-specific drying steps and because each is published by a university or cooperative extension service. Commercial recipe sites and product pages were not used for temperatures, times, or pretreatment concentrations.

What we could not verify

The main temperature and pretreatment steps come from the Colorado State guide, the drying time and dryness test come from SDSU Extension, and the conditioning method comes from a general vegetable drying guide. These sources agree broadly, but none of them is a controlled study of plum drying in home dehydrators. Drying times vary with fruit size, humidity, and airflow, and the ranges in this article are starting points rather than guarantees.

What the sources do not say

The sources do not give a single drying time that applies to every dehydrator or oven. They do not compare the texture of plums dried with and without pretreatment in a formal trial. They also do not state a specific moisture content measured with a laboratory instrument, beyond the approximate 80 percent moisture loss described by SDSU Extension. Where these details matter, consult a current extension publication for the plum variety in question.

Frequently asked questions

What temperature should be used to dry plums?

The Colorado State University guide directs drying at 140 degrees F (60 degrees C) in an oven or dehydrator. Set the equipment to that temperature and allow it to heat before loading the trays.

Do plums need to be pitted before drying?

Yes. The extension sources reviewed recommend removing pits before drying. The Colorado State guide directs that the pit be removed before the fruit is dried.

How long does it take to dry plums?

SDSU Extension gives 24 to 36 hours for plums in its described conditions, and the Colorado State guide describes drying until pliable and leathery. Dryness depends on size, humidity, and airflow, so check the pieces rather than relying on the clock alone.

Why should dried plums be conditioned?

Conditioning distributes residual moisture between pieces, as described in the Alabama Cooperative Extension vegetable drying guide. Pieces that show moisture during conditioning should be returned to the dehydrator.

Does pretreatment prevent darkening?

The Colorado State guide describes soaking cut plums in an anti-darkening solution such as ascorbic acid for 3 to 5 minutes to prevent darkening. Pretreatment affects color and appearance but does not replace complete drying.

Sources

Colorado State University Extension, Preserve Smart, Drying Plums/Prunes: https://apps.chhs.colostate.edu/preservesmart/produce/drying/plumsprunes/ (opened 2026-10-27). Quote: “Dry at 140 degrees F (60°C) in an oven or dehydrator.”
South Dakota State University Extension, Drying Plums, P-00272: https://extension.sdstate.edu/sites/default/files/2023-06/P-00272.pdf (opened 2026-10-27). Quote: “Plums will take 24-36 hours to dry.”
Alabama Cooperative Extension System, Drying Vegetables at Home: https://www.aces.edu/blog/topics/food-safety/drying-vegetables-at-home/ (opened 2026-10-27). Quote: “Conditioning distributes residual moisture evenly in dried food so there is less chance of spoilage.”