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Watermelon juice can be stored for about 24 hours in the refrigerator if it’s fresh and unpasteurized.
If you’ve been wondering how long you can store watermelon juice, the answer depends largely on how you store it and whether it’s homemade or commercially bottled.
Freshly squeezed watermelon juice without preservatives has the shortest shelf life, while store-bought versions can last much longer thanks to pasteurization and sealed packaging.
In this post, we’ll break down exactly how long you can store watermelon juice in different conditions, plus tips to keep it fresh and safe to drink.
Let’s dive in.
How Long Can You Store Watermelon Juice?
The short answer is that how long you can store watermelon juice depends on whether it’s fresh, refrigerated, or frozen.
Here’s a closer look at each scenario so you know exactly what to expect.
1. Fresh Homemade Watermelon Juice in the Fridge
If you’ve just blended or juiced a watermelon at home, you can store watermelon juice in the refrigerator for up to 24 hours.
After that, the flavor starts to fade, and the risk of bacterial growth increases.
The natural sugars in watermelon juice make it a favorable environment for microbes, so the clock starts ticking the moment you squeeze it.
For the best taste and safety, try to drink fresh watermelon juice within 12 hours.
2. Store-Bought Watermelon Juice
When you buy watermelon juice from a store, you can usually store it much longer than homemade versions.
Unopened pasteurized watermelon juice can last anywhere from 7 to 10 days past its sell-by date in the fridge.
Some shelf-stable varieties can even sit in your pantry for months before opening.
Once you open store-bought watermelon juice, though, you should store it in the refrigerator and drink it within 5 to 7 days.
Always check the label because storage recommendations vary between brands.
3. Frozen Watermelon Juice
If you want to store watermelon juice for the long haul, freezing is your best bet.
You can store watermelon juice in the freezer for up to 6 months without losing much flavor or nutritional value.
Pour it into ice cube trays or freezer-safe containers, leaving a little headspace for expansion.
When you’re ready to enjoy it, thaw the juice in the fridge overnight and give it a good stir before drinking.
Factors That Affect How Long Watermelon Juice Lasts
Not all watermelon juice is created equal, and several things determine how long you can store watermelon juice before it goes bad.
1. Pasteurization
Pasteurized juice is heated to kill harmful bacteria, which dramatically extends how long you can store watermelon juice.
Fresh, unpasteurized juice skips this step, so it spoils much faster.
2. Storage Temperature
The colder your fridge, the longer you can store watermelon juice.
Keep your refrigerator at or below 40°F (4°C) to slow bacterial growth.
Leaving juice out at room temperature for more than two hours is a no-go.
3. Container Type
Storing watermelon juice in an airtight glass jar or bottle helps it stay fresh longer than an open pitcher.
Oxygen speeds up oxidation, which dulls the flavor and color of your juice.
4. Added Preservatives
Some commercial brands add preservatives like citric acid or potassium sorbate.
These additives help you store watermelon juice for weeks rather than days.
Homemade juice without preservatives simply won’t last as long.
How to Tell If Watermelon Juice Has Gone Bad
Even if you follow all the right steps to store watermelon juice, it can still spoil.
Here are the signs to watch for.
1. Off Smell
Fresh watermelon juice smells sweet and clean.
If it smells sour, fermented, or just plain funky, toss it out.
2. Changes in Color
A fresh batch is bright pink or red.
If your juice turns brown or dull, that’s oxidation at work and a sign it’s past its prime.
3. Separation and Texture
Some separation is normal, but if the juice looks lumpy, thick, or fizzy, bacteria or yeast may be present.
4. Bubbles or Fizz
Fermentation creates bubbles, which means you should not store watermelon juice any longer once you spot them.
Tips to Store Watermelon Juice Longer
Want to stretch that window?
These simple tricks help you store watermelon juice safely for as long as possible.
1. Add a Squeeze of Lemon
A little lemon juice lowers the pH and slows spoilage.
It also helps preserve the color.
2. Use Airtight Glass Containers
Glass doesn’t hold onto odors or stains the way plastic can.
Fill the container to the top to minimize air exposure.
3. Keep It Cold from the Start
Don’t let your juice sit on the counter after juicing.
Pop it straight into the fridge.
4. Freeze What You Won’t Drink
If you can’t finish it within a day or two, freeze the rest right away.
That way, you can store watermelon juice for months without worrying about waste.
So, How Long Can You Store Watermelon Juice?
You can store watermelon juice for about 24 hours in the fridge if it’s fresh, 5 to 7 days if it’s opened store-bought juice, and up to 6 months in the freezer.
The exact time depends on pasteurization, temperature, and how you package it.
Always use your senses, and when in doubt, throw it out.
Now you know exactly how long you can store watermelon juice, so you can enjoy every last drop without any guesswork.