Our Easy Low Carb Keto Frozen Watermelon Slushie is the perfect low carb drink snack for the kids, and adults too, on a hot summer day! If you’re on a keto diet, you can enjoy this frozen watermelon slushie for just 5 carbs per serving and it’s low calorie too!

The Best Healthy Watermelon Slushie for Summer

When you’re craving something cold on a hot summer day, this healthy watermelon slushie is the perfect way to cool down. Made with fresh watermelon, fresh lime juice, ice, and your favorite keto sweetener (if needed), this refreshing summer drink has all the delicious watermelon flavor you love without any added sugar.

Unlike store-bought frozen drinks that are loaded with sugar, this homemade watermelon slushie recipe uses simple ingredients and relies on the natural sweetness of ripe watermelon. It’s a low carb, low calorie, family-friendly drink that’s perfect for anyone following a keto diet or simply trying to reduce sugar.

Whether you’re relaxing by the pool, hosting a barbecue, or looking for a refreshing afternoon snack, this beautiful watermelon slushie is one recipe you’ll make all summer long.

Low Carb Watermelon Slushie

I don’t know about your kids, but all mine want on a hot day in the summer is cold, frozen TREATS!!

With just 3 simple ingredients, this healthy watermelon slushie is the perfect way to cool off on a hot summer day.

Making use of a ripe watermelon that might not have been the sweetest one I picked, is why this recipe a winner!

Low Carb Keto Sweeteners

You can make this with or without a natural sweetener since a ripe watermelon often provides enough natural sweetness all on its own.

 I use low carb and keto sweeteners that don’t spike your blood sugar.

Use my Sweetener Guide & Conversion Chart if you want to change out the sweetener I used. 

Using a seedless watermelon makes it quite easy to blend up, but if not, just cut up the watermelon into pieces and pick out those seeds before blending. 

As long as you have a good high powered blender or even a food processor this is a perfect drink and the quickest way to fend off the kids when they are asking for something in the afternoon.

Tips for the Best Slushie Texture

​For the best slushy texture, start with very cold ingredients. If you have time, freeze your cubed watermelon or frozen watermelon cubes for a few hours before blending. Using frozen watermelon chunks creates an even thicker, frostier drink and means you’ll need less ice.

If you only have fresh watermelon, simply add the ice listed in the recipe card and blend until smooth. A high-powered blender or food processor makes quick work of the ice and creates that perfect frozen consistency everyone loves.

If you’d like to prep ahead, freeze extra watermelon in a single layer on a baking sheet, then transfer the frozen cubes to an ice cube tray or freezer bag for your next batch.

Why You’ll Love This Watermelon Slushie Recipe

​There are so many reasons this easy watermelon slushie recipe deserves a place in your summer recipe collection.

• made with only 3 simple ingredients
• naturally gluten free
• no added sugar
• only 5 grams net carbs per serving
• low carb and low calorie
• ready in just 5 minutes
• naturally hydrating thanks to watermelon’s high water content
• easy to customize with your favorite keto sweeteners
• the perfect healthy summer drink

Since watermelon already contains plenty of natural sweetness, you may not even need any sweetener if your melon is perfectly ripe.

Watermelon Wine Slushie

Not only is this a tasty treat by the pool when the kids have friends over, adults will enjoy it too!

You could make it boozy slushies by adding in some white wine or tequila for adult only alcoholic drinks,  if you prefer.

For adults, this recipe also makes a delicious watermelon cocktail. Add a splash of white rum, tequila, or even dry white wine to turn this frozen treat into one of your favorite skinny cocktails for summer entertaining.

For a lighter version, top each serving with club soda for a bubbly finish. It’s the perfect drink for sitting by the pool, enjoying a backyard cookout, or winding down after a long hot day.

It’s easy, it’s super quick and no cooking or heating the kitchen is required. That’s what I call a slam dunk in this business!

Ingredient Tips

Choose a ripe watermelon with deep color and plenty of juice for the best flavor. I always recommend using seedless watermelon, but if yours has large seeds, simply remove them before blending.

Freshly squeezed fresh lime juice adds brightness and balances the sweetness beautifully, though lemon juice also works if that’s what you have on hand.

A handful of fresh mint or even a small sprig of mint makes a beautiful garnish and adds an extra refreshing finish.

Brenda’s Notes:

Recipe card below shows a total of 36 ounces. I divided servings into 6 but you could divide into 4 drink servings and each person would have 9 ounces.

If you don’t have watermelon stevia, berry stevia or clear stevia would work as well. Or just use your favorite sweetener of choice to taste. Always start with a small amount and adjust if needed.

Frequently Asked Questions

Can I freeze watermelon ahead of time?

Yes! Cut your fresh watermelon into cubes and freeze them on a baking sheet before transferring to a freezer bag or ice cube tray. Frozen watermelon creates the best slushie texture and makes this recipe even colder.

Do I need sweetener?

Not always. If your ripe watermelon is naturally sweet, you may not need any sweetener at all. Taste after blending and add your favorite keto sweeteners only if needed.

Can I make this without a blender?

A high-powered blender works best, but a sturdy food processor can also create a delicious frozen slushie.

Is watermelon keto?

Watermelon contains more natural sugar than berries, but enjoyed in moderation it can absolutely fit into a low carb or keto diet. This recipe keeps portions reasonable while still delivering incredible watermelon flavor.

Serving Suggestions

Serve this healthy drink immediately in a tall glass or pour into mason jars for parties and cookouts. Garnish with a lime wedge, fresh mint, or a small watermelon slice for a beautiful presentation.

This refreshing drink pairs perfectly with grilled chicken, burgers, summer salads, or simply enjoyed as a cool afternoon tasty treat on a hot summer day.

More Easy Smoothies and Drink Recipes

Copycat Chick-Fil-A Frozen Lemonade

Vanilla Bean Frappucino

Mocha Caramel Iced Coffee

Mocha Iced Coffee Frappe

Sugar-Free Watermelon Slushie Recipe