This icy watermelon slushie is sweet, refreshing, and tastes like summer in a cup. I started making this a few years ago during a heat wave when my kids were begging for something cold and I had half a watermelon sitting in the fridge. It's become our go-to treat on scorching afternoons, and honestly, it's so much better than anything you'd buy at a convenience store.
Just four simple ingredients and a blender are all you need to make this hydrating frozen drink that both kids and adults can't get enough of. If you love fruity summer sips, you'll also want to try my Passion Fruit Iced Tea and Strawberry Iced Tea for more refreshing options.
Why You'll Love This Watermelon Slushie
Made with real fruit. No artificial flavors, no dyes, just pure watermelon blended into a refreshing frozen treat.
Naturally hydrating. Watermelon is over 90% water, so this slushie helps keep you hydrated on hot days while tasting like dessert.
Incredibly simple. Four ingredients, one blender, and about 10 minutes of active time. The hardest part is waiting for the watermelon to freeze.
Perfect for kids. This is a frozen watermelon drink kids go crazy for. It's sweet, cold, and fun to eat with a spoon or sip through a straw.
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Watermelon Slushie Ingredients
Here's what you need to make this refreshing frozen watermelon slushie.
See Recipe Card Below This Post For Ingredient Quantities
- Seedless watermelon: The star of the recipe. Frozen watermelon cubes blend into a smooth, icy base that's naturally sweet and incredibly refreshing. Make sure to use seedless for the easiest prep.
- Granulated sugar: Dissolves into the simple syrup to add just enough sweetness without overpowering the fresh Watermelon Slushie flavor. You can adjust this based on how sweet your watermelon is.
- Water: Combines with the sugar to create a smooth simple syrup that blends easily into the frozen watermelon.
- Lemon juice: Adds a bright, tangy kick that balances the sweetness and makes the watermelon flavor pop. Freshly squeezed lemon juice works best.
How To Make Watermelon Slushie
Making this watermelon slushie recipe is simple and fun.
- Freeze the watermelon: Cut the watermelon into cubes and spread them in a single layer on a baking sheet lined with wax paper or parchment paper. Freeze until completely firm, about 4 hours or overnight. Freezing them flat prevents them from clumping together.
- Make the simple syrup: In a small saucepan, combine the granulated sugar and water. Heat over medium heat, stirring occasionally, until the mixture is warm and the sugar has completely dissolved. Remove from heat, stir in the freshly squeezed lemon juice, and let the syrup cool completely before using.
- Blend: Once the watermelon is frozen solid, add the cubes to a high-powered blender like a Vitamix. Pour in the cooled simple syrup. Blend on high until the mixture is smooth, creamy, and slushy. If it's too thick to blend, let the watermelon sit at room temperature for about 15 minutes or add a tablespoon or two of water to help it along.
- Serve: Pour the slushie into cups and enjoy immediately with a spoon or straw. The texture is best right after blending, but you can also freeze leftovers and re-blend before serving.
Substitutions and Variations
Adjust the sweetness: If your Watermelon Slushie is super sweet, cut back on the sugar. If it's not very sweet, add an extra tablespoon or two to taste.
Add lime instead of lemon: Lime juice gives the slushie a slightly different tangy flavor that's equally delicious.
Make it a cocktail: Add a shot of vodka, tequila, or rum to turn this into a refreshing watermelon slushie cocktail for adults.
Mix in other fruits: Blend in frozen strawberries, raspberries, or pineapple for a mixed fruit slushie.
Add fresh mint: Toss in a few fresh mint leaves before blending for a mojito-inspired twist.
Skip the simple syrup: If you want it totally natural, blend the Watermelon Slushie with just lemon juice and no added sugar. My Guava White Tea Lemonade is another naturally sweet option.
What to Serve with Watermelon Slushie
This refreshing watermelon slushie pairs perfectly with all your favorite summer foods and activities.
Poolside snacks. Serve alongside chips and salsa, fresh veggie sticks with hummus, cheese and crackers, or a fruit platter. The icy slushie keeps everyone cool and hydrated between dips in the pool.
Grilled favorites. Pair with barbecue chicken, grilled burgers, hot dogs, or ribs for a classic summer cookout. The sweet, refreshing slushie cuts through rich, smoky flavors beautifully.
Picnic foods. Bring it along with sandwiches, pasta salad, coleslaw, and watermelon wedges for an outdoor meal. Pack it in a cooler with plenty of ice to keep it frozen.
Taco night. The light, fruity flavor complements spicy tacos, nachos, or quesadillas perfectly. It's a cooling contrast to bold, savory Mexican dishes.
Breakfast or brunch. Serve with pancakes, waffles, French toast, or a big fruit salad for a fun weekend brunch. It's a refreshing alternative to regular juice.
Beach day treats. Pack frozen watermelon cubes in a cooler and blend fresh slushies right at the beach using a portable blender. Pair with sandwiches, chips, and fresh fruit.
Light summer lunches. Enjoy with grilled chicken salad, caprese skewers, or veggie wraps for a light, refreshing meal that won't weigh you down on hot days.
EQUIPMENT
High-powered blender: A Vitamix or similar high-powered blender makes blending frozen fruit smooth and easy. Regular blenders might struggle with the frozen watermelon.
Baking sheet: For freezing the watermelon cubes in a single layer so they don't stick together.
Wax paper or parchment paper: Prevents the watermelon from sticking to the baking sheet while freezing.
Small saucepan: For making the simple syrup on the stove.
Storage and Reheating Tips
This watermelon slushie is best enjoyed fresh right after blending when the texture is perfectly icy and smooth.
If you have leftovers, you can store them in an airtight container in the freezer for up to 2 weeks. The slushie will freeze solid, so you'll need to let it thaw slightly and re-blend before serving.
You can also freeze the watermelon cubes ahead of time and keep them in a freezer bag for up to 3 months. Then you can make fresh slushies whenever you want.
The simple syrup can be made a few days in advance and stored in the fridge until you're ready to blend.
Serving Suggestions
Serve at pool parties. This is the ultimate poolside drink. Kids love it, and it keeps everyone cool and hydrated.
Pair with grilled foods. Serve alongside burgers, hot dogs, grilled chicken, or barbecue for a refreshing contrast to smoky, savory flavors.
Make it a dessert. Portion into small cups and top with whipped cream or fresh berries for a light, fruity dessert.
Enjoy with brunch. This pairs beautifully with pancakes, waffles, or fruit salad for a fun weekend brunch drink.
Expert Tips
Freeze the watermelon overnight. The firmer the Watermelon Slushie, the better the slushie texture. If it's not fully frozen, it'll turn out more like juice than a slushie.
Use a high-powered blender. A Vitamix or similar blender makes quick work of frozen fruit and creates a perfectly smooth texture. Regular blenders might need extra liquid or struggle to blend.
Let it soften if needed. If the frozen watermelon is too hard to blend, let it sit at room temperature for 10 to 15 minutes. Don't let it thaw completely, just soften slightly.
Taste as you go. Watermelons vary in sweetness, so taste the slushie before serving and adjust the sugar or lemon juice to your liking.
Serve immediately. The texture is best right after blending. If it sits too long, it'll start to separate and lose that slushy consistency.
FAQ
What to put in a watermelon slushie?
The basics are frozen watermelon, simple syrup, and lemon juice. From there, you can add lime juice, fresh mint, other frozen fruits like strawberries or raspberries, or even a splash of coconut water for extra hydration. For adults, a shot of vodka or tequila makes a great addition.
Can I blend watermelon and freeze it?
Yes! You can blend fresh watermelon into juice and then freeze it in ice cube trays. Once frozen, blend those cubes into a slushie. However, freezing the cubed watermelon first and then blending gives you a thicker, creamier texture similar to sorbet.
What is good to mix with Watermelon Slushie?
Watermelon Slushie pairs beautifully with lemon, lime, mint, cucumber, strawberries, raspberries, coconut, and basil. For drinks, it mixes well with lemonade, iced tea, coconut water, or sparkling water. Try my Apple Iced Tea with fresh watermelon cubes for another refreshing combo.
What kind of fruit is best in a slushie?
Fruits with high water content work best in slushies. Watermelon, strawberries, mango, pineapple, peaches, and raspberries all blend into smooth, icy textures. Bananas also work but create a creamier, milkshake-like consistency rather than a true slushie.
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Pairing
These are my favorite dishes to serve with Watermelon Slushie
Watermelon Slushie
Ingredients
Method
- Place cubed watermelon in a single layer on a parchment-lined baking sheet. Freeze until the watermelon is firm, about 4 hours or overnight.
- In a small saucepan, add the sugar and water. Cook over medium heat until the sugar dissolves. Remove from heat, then stir in lemon juice and let cool completely.
- Add the frozen watermelon and the cooled simple syrup to a high-powered blender. Puree until smooth.
- Pour into cups and enjoy with a spoon or straw.
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