Plums dry into tart, chewy-crisp slices that are a favorite in granola and for snacking. They are about 87% water, so a pound of pitted plums makes roughly 2 ounces dried.
They earn a “tricky” rating because of the skin. Plum skins are waxy and hold water in, so whole or halved plums can take a very long time and still come out soft in the middle. Thin slices with plenty of cut surface solve most of that.
Sugar is the other variable. Ripe plums are sweet and juicy, and the juice can turn tacky on the trays. Firm-ripe fruit slices better and dries more evenly than soft fruit; soft plums are better cooked into sauce or puree first.
Prep and loading
- Wash, halve and pit.
- Slice about ¼ inch thick. Thinner is better than thicker with plums.
- Lay slices skin side down in a single layer, not touching.
- Use a long cycle and check the thickest slice before ending it.
How to tell it’s dry
- Slices are crisp or firmly chewy, not soft, and the flesh is dry right up to the skin.
- A broken slice shows no darker, wet line under the skin.
A steady weight only shows the drying has stopped; breaking the thickest piece is the check that counts. Neither is a safety test. Safety comes from tested prep, safe cooking temperatures where needed, complete drying and airtight packing. See what a kitchen scale can and cannot tell you.
Not sure? The weight check compares two weighings and the expected dry weight for plums.
Problems and fixes
Soft and sticky after a full cycle
The skin held water in. Slice thinner, add dry time, and avoid very ripe fruit.
Very tart
Drying concentrates the acid in the skin. Peel half the batch and compare, or use them in baking.
Rehydrating and storing
Rehydrate: Soak 15 minutes, or cook into sauces and baking. By weight, 100 g of dried plums takes back about 646 g of water to return to fresh weight; the rehydration calculator does any amount.
Store: Mylar with an oxygen absorber. Slightly chewy slices should be eaten sooner; fully crisp ones keep longer.
Ways to use it
- Snacking
- Granola
- Baking
- Plum sauce after rehydrating
How much fits per batch
At a normal single layer, plums load at roughly 2.2 lb of fresh food per square foot of tray. That works out to:
| Machine | Fresh per batch | Dried per batch |
|---|---|---|
| Harvest Right Countertop 360 | 5.5 lb | 11.7 oz |
| Harvest Right Small | 6.6 lb | 14.2 oz |
| Harvest Right Medium | 10.3 lb | 1.38 lb |
| Harvest Right Large | 16.9 lb | 2.27 lb |
| Harvest Right X-Large | 34.4 lb | 4.61 lb |
Sources
- USDA FoodData Central: plums, raw (water content)
- Utah State University Extension: Can I Freeze-Dry That? (2026)
- Penn State Extension: Let’s Preserve: Freeze-Drying
- Iowa State University Extension AnswerLine: Preserving by home freeze drying
Water content rounded from USDA FoodData Central (plums, raw). Cycle times are typical ranges at default settings; thickness, load and your room change them. How we put these together.