Do you refrigerate watermelon radishes?

When it comes to storing watermelon radishes, the main question is whether you need to refrigerate them or if they can be left out at room temperature. Watermelon radishes, also sometimes called watermelon daikon or shinrimei, are a type of radish known for their pale green skin and vibrant pink interior that resembles a watermelon. But unlike regular radishes, do watermelon radishes require refrigeration?

Quick Answer

Yes, it is recommended to refrigerate watermelon radishes to maintain freshness and crisp texture. Leaving them out at room temperature will cause them to lose moisture and become limp more quickly.

Do Watermelon Radishes Need to Be Refrigerated?

Watermelon radishes should be refrigerated for optimal storage. The cool temperature of the refrigerator will help slow down the loss of moisture. Watermelon radishes have a high water content, so they tend to lose their crunchiness faster at room temperature as the water evaporates.

Additionally, the humidity of the refrigerator will help keep watermelon radishes hydrated. If they are left unrefrigerated, they will tend to shrivel up and get soft within a couple days. Refrigeration preserves that nice snappy texture that watermelon radishes are known for.

Maintaining Crispness

Keeping watermelon radishes crisp and hydrated is the main reason refrigeration is recommended. The cool and humid environment retards moisture loss. Without refrigeration, the radishes will quickly lose their water content to the air and become limp.

Preventing Spoilage

Refrigeration also slows the growth of bacteria, extending the shelf life of watermelon radishes. Higher temperatures will allow microbes to multiply faster, causing the radishes to deteriorate and spoil rapidly.

Retaining Flavor

Additionally, refrigeration helps lock in the flavor of watermelon radishes. When left out at room temperature, the sugars start breaking down faster, causing the flavor to become less sweet and more bitter. Refrigeration slows this process down.

Proper Storage

To get the most out of refrigerating watermelon radishes, follow these storage tips:

  • Store unwashed, dry radishes in a perforated plastic bag in the crisper drawer of the refrigerator.
  • Do not wash them until ready to eat, as excess moisture will speed up spoilage.
  • Use within 1-2 weeks for best quality and flavor.
  • Check regularly and remove any radishes that are becoming soft or slimy.

Use Breathable Packaging

A perforated plastic produce bag that allows for air flow can help extend the life of watermelon radishes in the fridge. A sealed container traps moisture and speeds up deterioration.

Keep Them Dry

Do not wash watermelon radishes until just before eating. Washing will introduce excess moisture that can lead to faster spoilage in storage.

Watch for Spoilage

Occasionally inspect the radishes and remove any that are showing signs of mold or rotting. Promptly discard any spoiled pieces to prevent spread.

Enjoy Within 2 Weeks

For best flavor and texture, aim to eat refrigerated watermelon radishes within 1-2 weeks after purchasing.

Storing at Room Temperature

While refrigeration is the recommended method, watermelon radishes can be kept unrefrigerated for shorter term storage:

  • Keep them in a cool, dry place out of direct sunlight.
  • Plan to use within 3-5 days.
  • Check frequently for shriveling or spoilage.

Pick a Cool Spot

To maximize their shelf life at room temp, store watermelon radishes somewhere cooler like a basement pantry instead of on the hot kitchen counter.

Use Quickly

Expect watermelon radishes left out on the counter to last only 3-5 days before losing flavor and texture.

Monitor Closely

Inspect unrefrigerated watermelon radishes every day and discard any that are drying out or showing signs of mold.

Signs of Spoilage

Watch for these signs that watermelon radishes have gone bad:

  • Shriveled, dried out appearance
  • Soft, mushy texture
  • Brown or black spots of mold
  • Unpleasant sour aroma
  • Slimy feel


As watermelon radishes lose moisture, they will start to shrivel and look deflated. At this point, they have lost their crunchy texture.

Mold Growth

The development of fuzzy black, blue, or green mold indicates spoilage. Discard any radishes with mold immediately.

Soft Spots

A watermelon radish that has turned soft or mushy is past its prime and should be discarded.

Foul Smell

An unpleasant or sulfur-like smell is a sign watermelon radishes have started to rot and should not be eaten.

Preparation Tips for Watermelon Radishes

Here are some tips for prepping and eating watermelon radishes:

  • Wash just before use and peel if desired. Peeling removes some flavor.
  • Slice thinly or shave into ribbons to showcase the color.
  • Add to fresh salads, slaws, and veggie platters for crunch.
  • Stir fry quickly with other crisp vegetables to retain texture.
  • Pickle in vinegar brine for a tangy snack.


Only wash watermelon radishes right before eating. Washing too far in advance will shorten their shelf life.


You can peel watermelon radishes if desired, but the skin contains nutrients and flavor. Leaving it on is recommended.


Cut watermelon radishes into thin slices or matchsticks to highlight the colorful interior. Round radishes can be sliced into wedges.

Cooking Quickly

Only cook watermelon radishes briefly to retain their signature crunch. They can be added raw to many dishes as well.


For a fun way to enjoy watermelon radishes, try pickling them into a tangy, probiotic-rich snack.

Nutrition Facts

Here is the nutrition breakdown for a 1 cup raw serving (116g) of watermelon radishes (source: USDA):

Nutrient Amount % Daily Value
Calories 14 1%
Total Fat 0.1g 0%
Cholesterol 0mg 0%
Sodium 39mg 2%
Potassium 233mg 7%
Total Carbs 3.4g 1%
Dietary Fiber 1.9g 6%
Protein 0.9g 2%
Vitamin C 29.3mg 35%
Calcium 25.5mg 3%
Iron 0.5mg 3%

Watermelon radishes are very low in calories and fat. They provide dietary fiber, vitamin C, potassium, and small amounts of other nutrients.

Low Calorie

With only 14 calories per cup, watermelon radishes are a low-calorie food that can help support weight management.

High in Vitamin C

A 1 cup serving provides over a third of the daily recommended intake for vitamin C, an important antioxidant.

Good Source of Potassium

Watermelon radishes contain 233mg of potassium per cup, which plays a role in muscle contraction and heart function.

Decent Fiber

The 1.9g of fiber in a serving of watermelon radishes supports digestive and heart health.

Health Benefits

Eating watermelon radishes may provide these health benefits:

  • May promote healthy digestion and regularity due to fiber content
  • May support weight loss as a low-calorie, high volume food
  • May reduce risk of certain cancers thanks to antioxidant content
  • May provide anti-inflammatory benefits
  • Potassium content helps regulate blood pressure

Digestive Health

The fiber in watermelon radishes can help keep bowel movements regular and promote a healthy gut.

Weight Loss

Watermelon radishes may aid weight loss efforts due to being low in calories yet high in volume, helping create feelings of fullness.

Cancer Prevention

Antioxidants like anthocyanins found in watermelon radishes may help protect against certain cancers by reducing free radical damage.

Anti-Inflammatory Effects

Compounds found in watermelon radishes may help reduce inflammation in the body when consumed regularly.

Blood Pressure Management

The potassium in watermelon radishes helps regulate blood pressure levels by balancing out sodium.

Risks and Precautions

Watermelon radishes are generally safe to eat but consider these precautions:

  • Those with kidney issues should limit potassium intake from radishes.
  • Radishes may trigger reactions in people with oral allergy syndrome.
  • Eat in moderation if you have thyroid problems, as radishes contain goitrogens.
  • Introduce slowly to infants and young children.

Kidney Disease

People with impaired kidney function may need to limit dietary potassium. Consult your doctor about radish consumption.

Allergy Concerns

Watermelon radishes may cause itching, swelling, or irritation in those with oral allergy syndrome triggered by other fruits and vegetables.

Thyroid Issues

Compounds called goitrogens in radishes may impact thyroid function if consumed in excess.

Babies and Toddlers

Introduce watermelon radishes slowly and in small amounts to young children. Monitor for tolerance.

The Bottom Line

Watermelon radishes have a higher water content than regular radishes and should be refrigerated for the best flavor, texture and shelf life. Storing them unwashed in perforated bags in the crisper drawer keeps watermelon radishes crisp and hydrated for 1-2 weeks. At room temperature, they only last 3-5 days before losing their signature crunch. Watermelon radishes provide vitamin C, potassium, and antioxidants along with a crunchy, juicy addition to salads, slaws, and veggie plates.

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