This Watermelon Slushie Recipe is bright, icy, and pure summer in a glass. Made with just frozen watermelon, a squeeze of lime, fresh mint, and a touch of maple syrup, it blends into the kind of thick, slushy drink that cools you down from the inside out.
I started making this a few summers ago when I had way too much watermelon sitting on my counter, and now it's what I reach for every time the heat gets unbearable. It's naturally sweet, incredibly refreshing, and so easy you don't even need to think twice. If you love frozen fruit drinks, you'll also want to try this Frozen Peach Lemonade Recipe or this White Christmas Mojito. And if you're looking for more ways to use up fresh watermelon, this Vanilla Strawberry Iced Tea Recipe is another favorite around here.
Why You'll Love This Watermelon Slushie
This watermelon slushie checks all the boxes. It's naturally vegan, gluten-free, and free from refined sugar, so you can feel good about serving it to everyone. The frozen watermelon creates that thick, slushy texture without watering it down with ice, and the lime adds just enough tang to balance the sweetness. Mint brings a cool, herby note that makes the whole thing taste like something you'd order at a juice bar. It comes together in about 15 minutes, and you only need four ingredients. Plus, it's a great way to use up a big watermelon before it goes bad.
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Ingredients For Watermelon Slushie Recipe
Here's what makes this watermelon slushie so refreshing and naturally sweet.
- Seedless watermelon cubes: The frozen watermelon is the star here. Freezing it solid creates that thick, icy texture without needing any ice cubes, which would just water it down. Make sure it's been in the freezer for a full day so it blends up smooth and slushy.
- Maple syrup : Adds a touch of natural sweetness. Start with 2 tablespoons and taste as you go, since some watermelons are sweeter than others. You can swap this for honey, agave, or any liquid sweetener you prefer.
- Lime juice : Brightens everything up and balances the sweetness with a little tartness. Freshly squeezed is best, but bottled lime juice works in a pinch.
- Fresh mint or basil leaves: Mint adds a cool, refreshing note that makes this slushie feel extra special. Basil works too if you want something a little more herby and unexpected.
- Filtered water: Helps the blender do its job and keeps the slushie from being too thick to sip. You can add more or less depending on how thick you like it.
See recipe card for quantities.
Instructions For Watermelon Slushie
Here's how to blend up the perfect watermelon slushie in just a few simple steps.
Let the watermelon soften slightly: Pull your frozen watermelon cubes out of the freezer and let them sit on the counter for 5 to 10 minutes. This makes them easier to blend and keeps your blender from working too hard.
Add everything to the blender: Toss the watermelon, 2 tablespoons of maple syrup, lime juice, mint (if you're using it), and filtered water into your high-speed blender.
Pulse and blend: Start by pulsing the blender a few times to break up the frozen chunks, then blend on high until everything comes together into a thick, slushy consistency. If you have a tamper, use it to push the watermelon down toward the blades.
Taste and adjust: Give it a taste and see if it needs more sweetness. Add another tablespoon or two of maple syrup if your watermelon isn't very sweet. If it's too thick to sip, blend in a little more water until it's just right.
Serve immediately: Pour into 4 glasses, grab some straws, and enjoy while it's still icy and cold.
Substitutions & Variations
Sweetener swap: Use honey, agave nectar, or simple syrup instead of maple syrup. You can also skip the sweetener entirely if your watermelon is super ripe and sweet. Make it fizzy: Swap the filtered water for flavored sparkling water for a bubbly, refreshing twist. . Skip the mint: If you're not a mint fan, leave it out or try fresh basil for a different flavor. Use a different citrus: Swap lime juice for lemon juice if that's what you have on hand.
Equipment For Watermelon Slushie Recipe
High-speed blender (with tamper recommended): A Vitamix or similar blender works best for frozen fruit. If your blender doesn't have a tamper, a food processor can work too. Measuring cups: For portioning out the watermelon and water. Citrus juicer (optional): Makes juicing the lime easier, but you can squeeze it by hand. Serving glasses: Tall glasses work best for serving this slushy drink.
Storage & Make-Ahead Tips
This watermelon slushie is best enjoyed fresh, right after blending. It will start to separate and melt if it sits too long, so try to serve it immediately.
If you have leftovers, pour them into ice cube trays or freezer-safe containers and freeze. You can re-blend the frozen slushie cubes with a splash of water to bring it back to life.
To prep ahead, cube and freeze your watermelon in advance. It needs at least 24 hours in the freezer to get solid enough for that thick, icy texture.
Expert Tips For Watermelon Slushie
Freeze the watermelon solid: Make sure your watermelon has been frozen for at least 24 hours. If it's not frozen enough, you'll end up with a watery smoothie instead of a thick slushie. Use a tamper if you have one: It helps push the frozen fruit down into the blades and prevents the blender from getting stuck. Start with less sweetener: Watermelon varies in sweetness, so start with 2 tablespoons of maple syrup and add more if needed. Adjust the thickness: If the slushie is too thick to blend, add water a few tablespoons at a time. If it's too thin, add more frozen watermelon. Serve immediately: This slushie melts fast, so blend it right before you're ready to serve.
FAQ
How to make the best watermelon slushie?
The secret is using frozen watermelon instead of ice. Freeze your watermelon cubes for at least 24 hours, then blend them with lime juice, mint, and a touch of maple syrup. A high-speed blender with a tamper works best for getting that thick, slushy texture. Taste as you go and adjust the sweetness and consistency to your liking.
How do you make a watermelon slushie for kids?
This recipe is already kid-friendly! Just use frozen watermelon, a little maple syrup for sweetness, and skip the mint if your kids don't like it. Blend it up with water and lime juice, and they'll love the bright pink color and sweet, icy taste. My friend's kids couldn't get enough of it.
How to make watermelon slushie with ice?
If you don't have frozen watermelon, you can use fresh watermelon and add ice cubes instead. Use about 6 cups of fresh watermelon and 2 to 3 cups of ice, then blend with lime juice, mint, and sweetener. It won't be quite as thick, but it'll still be refreshing.
What is good to mix with watermelon?
Watermelon pairs beautifully with lime, lemon, mint, basil, cucumber, ginger, and even a splash of coconut water. For a slushie, lime and mint are my favorites because they add brightness and balance the sweetness. You can also add berries like strawberries or raspberries for extra flavor.
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Frozen Watermelon Slush Drink
Ingredients
Equipment
Method
- Allow the frozen watermelon pieces to rest at room temperature briefly so they soften slightly, then place them into a blender along with maple syrup, lime juice, herbs, and water.
- Use the pulse setting to break down the watermelon, then blend until the mixture becomes thick and icy, adjusting sweetness or liquid as needed.
- Pour the slush evenly into serving glasses and enjoy immediately while frosty.
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