How to Freeze Fresh Rhubarb So You Can Enjoy It Year-Round, According to Experts

Rhubarb has a short but vibrant season, ranging from April to June. With its signature tart flavor and striking color, it brings pies, crumbles, and savory dishes to life. To make the most of this ingredient, freezing it at peak freshness is a simple and effective solution.

We spoke with food storage experts to learn which methods work best, so you can enjoy rhubarb for up to 12 months. Ahead, they share how to prepare fresh stalks, freeze them properly, and thaw them easily for baking and cooking year-round.

Harvest and Preparation

Freezing rhubarb is one of the best ways to preserve its nutrients and maintain its fresh flavor. For optimal quality, harvest, wash, prep, and freeze it all in the same day, says Stephanie McCurdy, a health, human science, agriculture, and natural resources educator.

If you're harvesting rhubarb yourself, pick stalks when they reach 10 to 15 inches long, according to Shannon Stover, a food safety educator. Look for stalks that feel firm, tender, and well-colored. "When harvesting rhubarb, hold the stalk firmly and pull with a slight twist," she says. "You do not want to cut the stalks as this will allow for disease to enter the plant's crown."

If you're shopping at the grocery store, choose stalks that are undamaged, Stover says. "The stalks can be kept in the refrigerator, unwashed and wrapped tightly in plastic, for up to 3 weeks," she adds.

Before freezing, rinse the stalks under a cool stream of water, and pat them dry. Cut off and discard the leaves, then remove any brown spots and trim the ends.

Freezing Methods

McCurdy and Stover recommend three simple methods for freezing rhubarb, each suited to different uses:

Flash freezing: Wash the rhubarb carefully in cold water, then pat it thoroughly dry. Cut into ½-inch pieces, then spread them in a single layer on a baking sheet, making sure they don't touch. Place the tray in the freezer until the pieces are frozen solid. Transfer the frozen rhubarb to a freezer-safe container and freeze promptly. This method works best if you want to prevent clumping.

Dry pack: Wash the rhubarb in cold water, and cut it into 1-inch pieces. Blanch in boiling water for 1 minute, then immediately cool in cold water to help retain color and flavor. Pack the rhubarb tightly into a freezer-safe container without adding sugar, leaving ½ inch headspace. Seal and freeze promptly.

Syrup pack: For a sweeter option, freeze rhubarb in syrup. Prepare a 30 percent syrup by dissolving 2 cups of sugar in 4 cups of boiling water, and stir until clear. After blanching the rhubarb, pack it tightly into a freezer-safe container, and cover completely with the cooled syrup. Leave ½ inch of headspace, then seal and freeze promptly.

How Long Frozen Rhubarb Lasts

When you freeze rhubarb properly, it can last in the freezer for up to one year. This time frame helps preserve both its quality and nutritional value, so you and your family can enjoy it at its best, Stover says.

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How to Thaw Rhubarb Before Cooking or Baking

For thawing fruit, Stover and McCurdy recommend a couple of reliable methods.

Thaw in the refrigerator: Place the rhubarb in a bowl, and cover it. Let it thaw in the refrigerator for at least 6 to 8 hours. This method works best when texture matters most, as it helps the rhubarb retain its structure, Stover says.

Thaw under running water: If you need a quicker option, place the rhubarb in an airtight bag and submerge it in water at 70 degrees Fahrenheit with a gentle, continuous flow. This speeds up the thawing process while keeping the fruit contained.

You can also use a microwave to thaw rhubarb, but it may result in a softer, mushier texture, Stover notes.