Watermelon Slushie Recipe (Only 4 Ingredients)

This watermelon slushie is a refreshing homemade drink made with frozen watermelon, lime juice, fresh mint, and a touch of maple syrup blended into a smooth, icy texture. It's a simple summer recipe that comes together in minutes using just a blender. 👇👇

Watermelon slushie in a glass with a straw and topped with a mint leaf.

When watermelon season hits, this is one of the easiest ways to turn extra fruit into something refreshing. Freezing the watermelon ahead of time creates that thick slushie texture without needing ice.

If you're trying to stretch summer produce and avoid expensive store-bought drinks, this watermelon slushie is a budget-friendly homemade recipe that works for backyard BBQs, afternoon snacks, or hot days when everyone wants something cold.

Why I Love This Recipe

Only a few ingredients - watermelon, lime, maple syrup, and water.
Great way to use extra watermelon - especially when the fruit is very ripe.
Naturally sweet - maple syrup adds sweetness without needing sugary mixes.
Kid-friendly summer drink - refreshing and fun for hot afternoons.
Easy to customize - add mint, basil, or sparkling water for different flavors.
Budget-friendly homemade drink - cheaper than buying smoothies or slushies.

Andi is using a citrus juicer to squeeze lime juice over the cubed watermelon and mint leaves that are in the blender.

Note From Andi:

My daughter loves watermelon, but lately, the ones from the grocery store haven't been the best. Instead of tossing them out, I started cutting the watermelon into small cubes and freezing them for later.

When I first blended these frozen cubes into a slushie, I honestly didn't expect it to be this good. The drink is light, refreshing, and naturally sweet, and the little hint of fresh mint really makes the flavor pop.

It's one of those simple recipes that turns leftover fruit into something really special. So good.

Watermelon Slushie Ingredients 👇👇

This watermelon slushie uses simple ingredients that blend together quickly:

10 cups seedless watermelon cubes, frozen for at least 24 hours - freezing the watermelon creates the thick slushie texture without needing ice.
2-4 Tbsp maple syrup - adds natural sweetness without needing sugary drink mixes.
juice of 1 large lime
¼ cup fresh mint or basil leaves (optional but highly recommended) - mint gives the drink a fresh summer flavor, while basil adds a slightly herbal twist.
1½ cups water

Step-By-Step Instructions 👇👇

Watermelon is sliced and then cubed on a cutting board with a knife, and then the watermelon cubes are frozen.

STEP 1: Freeze the Watermelon

Cut a seedless watermelon into small cubes and spread them in a single layer on a rimmed baking sheet lined with parchment paper. Place the tray in the freezer and freeze the watermelon cubes overnight, or at least 24 hours, until completely solid.

Once frozen, transfer the watermelon cubes to a freezer bag or airtight container so they're ready to use anytime.

Four collage images one with watermelon cubes in a blender, then water and mint are added to the watermelon, then the watermelon slushie, and an over-the-top image of watermelon slushie in the blender.

STEP 2: Add Ingredients to the Blender

Add 10 cups frozen watermelon cubes, 2 Tbsp maple syrup, juice of 1 large lime, ¼ cup fresh mint leaves (optional), and 1½ cups filtered water to a high-speed blender.

Pulse a few times to help start breaking up the frozen watermelon.

STEP 3: Blend Until Slushie

Blend until the mixture forms a thick slushie texture. If the mixture is too thick, add a little extra water and blend again.

Taste and add more maple syrup if needed, depending on how sweet the watermelon is.

STEP 4: Serve Immediately

Pour the watermelon slushie evenly into glasses and serve right away. The icy texture is best when freshly blended.

A glass of watermelon slushie with a straw.

Recipe Tips

Freeze watermelon in advance so you can make this drink quickly anytime.
Cut watermelon into small cubes before freezing so the blender can break it up easily.
Adjust sweetness depending on how ripe the watermelon is.
Use a high-speed blender for the smoothest slushie texture.
For a fizzy slushie, prepare the drink as written, then top each glass with a little sparkling water before serving.

Make Ahead Tips

You can prep the watermelon cubes ahead of time to make this recipe faster later.

Cut watermelon into small cubes and freeze in a large freezer bag.
Store frozen cubes up to 3 months.
Blend directly from frozen when you're ready to make slushies.

Having frozen watermelon ready in the freezer makes this recipe almost instant.

Flavor Variations

Once you know the basic method, it's easy to change the flavor.

Mint Watermelon Slushie: Blend with fresh mint leaves for a refreshing herbal flavor.
Basil Watermelon Slushie: Use basil instead of mint for a slightly savory twist.
Sparkling Watermelon Slushie: Replace some of the water with sparkling water for a fizzy drink.
Strawberry Watermelon Slushie: Add a handful of frozen strawberries for extra berry flavor.

If you enjoy refreshing homemade drinks like this watermelon slushie, you can browse more ideas in my beverages collection, including classics like homemade lemonade or the bubbly sparkling strawberry lemonade for hot summer days.

Watch How To Make Watermelon Slushie 👇👇

This watermelon slushie blends together quickly once the watermelon cubes are frozen. The blender breaks the fruit into a thick, icy drink that tastes naturally sweet and refreshing.

How To Store Leftovers

Watermelon slushies are best served fresh right after blending.

If you have leftovers, pour the mixture into an ice cube tray and freeze until solid. Transfer the frozen cubes to a freezer bag and store in the freezer for up to 6 months.

To remake the slushie, add the frozen cubes back to the blender with a little water and blend until smooth again.

If you have extra watermelon to use up, fresh side dishes like watermelon cucumber salad or watermelon arugula salad are simple recipes that work well with grilled meals and backyard dinners from my summer BBQ recipe collection.

A blender with cubes of frozen watermelon and mint leaves.

FAQs

Can I use fresh watermelon instead of frozen?

Yes, but the texture will be more like a smoothie. Freezing the watermelon first gives it the classic slushie consistency.

Do I have to add maple syrup?

No. If your watermelon is very ripe and sweet, you may not need additional sweetener.

Can I make this without herbs?

Absolutely. Mint and basil add flavor, but the slushie tastes great with just watermelon and lime.

For an easy summer dessert spread, recipes like fruit salad, colorful fruit pizza, or homemade rainbow real fruit popsicles all pair nicely with refreshing drinks like this.