How to Freeze Mulberries

Mulberries ripening in late spring
Mulberries ripening in late spring. Leda Meredith

Mulberries are only in season for a few weeks in late spring and early summer. Freezing is the easiest way to preserve mulberries. These instructions ensure that the berries do not clump together but remain loose so that later on you can easily take out just the amount you want.

Mulberries almost always come off of the tree with a little bit of stem attached. You can leave the stem, it will not affect the berry. Or, you can take the time to remove the stem bits.

Wash the Mulberries

Wash the mulberries under cool water and let them drain for a few minutes in a colander. Washing removes bacteria that could be lurking on the berries, such as salmonella, E. coli, or norovirus.

Single-Layer Freeze

Spread the whole, washed mulberries in a single layer on a baking sheet or on plates. Freeze the fruit, uncovered, for at least two hours. This step is what ensures that the berries will remain separate once they are frozen.

Transfer to Freezer Containers

Transfer the frozen berries to freezer bags or containers. Label and date the bags or containers. It is recommended that you use BPA-free, non-plastic freezer containers. You can store mulberries in the freezer for up to six months. They are still fine to eat after that, but their quality and flavor degrade over time.

Ways to Use Frozen Mulberries

Blend straight-out-of-the-freezer mulberries with milk (or a non-dairy alternative), yogurt, honey or another sweetener of your choice. The frozen berries will give the smoothie a thick, cold, milkshake-like texture.

You can add still-frozen mulberries to pancakes, muffins, and quick breads. Although the mulberries will cook along with the rest of the ingredients, berries that start out frozen in these recipes will not bleed their color as much as fresh berries tend to do.

Frozen mulberries are just as good as fresh for making mulberry jam and other sweet preserve recipes. Stockpile them in the freezer during the harvest season, and get around to that jam project later when you have time.

You can use frozen mulberries to make sorbet or ice cream, but you will need to thaw the fruit before you transform it into one of those frozen desserts. Whether you use fresh or frozen mulberries, the result will be just as delicious.

Thaw frozen mulberries and then puree them to make a simple, flavorful sauce to spoon over yogurt, cake, or fresh fruit. If you think the sauce needs it, add a little honey or sugar and a small squeeze of lemon juice to intensify the mulberry flavor.

Besides being widely used in pies and tarts, it is a popular addition to wines, cordials, and herbal teas. 

The fruit and leaves are sold in various forms as nutritional supplements. The mature plant contains significant amounts of resveratrol, particularly in the stem bark, which some speculate can lead to longevity.

Nutritional Facts

A 3.5-ounce serving of raw mulberries has 43 calories, can provide up to 44 percent of your daily value of vitamin C, and 14 percent of your iron needs.