Watermelon Ice Cream Floats

The air conditioning had broken down during the worst heatwave of July, and my cousin Sarah showed up at my back door with a whole watermelon under one arm like she was delivering a prize. We spent the afternoon experimenting with combinations that might save us from melting into the floorboards, and somewhere between her third attempt at blending watermelon with seltzer and my suggestion to just add ice cream already, this float happened. The first sip made us forget we were sweating entirely.

I served these at my nieces eighth birthday party last summer, setting up a little float station on the back porch. The kids went quiet for exactly thirty seconds after taking their first sips, then someone yelled this is better than the ice cream truck and that became the official verdict of the afternoon. Even the parents who claimed they were too full from barbecue somehow found room for a second glass.

Ingredients

• Seedless watermelon: Chilling the cubes beforehand makes all the difference between a refreshing float and one that tastes lukewarm and disappointing
• Fresh lime juice: Just a tablespoon wakes up the watermelons natural sweetness and keeps the whole thing from tasting cloying
• Vanilla ice cream: Use a good quality brand here because cheap ice cream melts too fast and leaves you with weird foamy texture
• Lemon lime soda: Well chilled is non negotiable unless you want sad lukewarm floats and disappointed faces staring at you
• Fresh mint: Optional but that little herbal hit against the sweet cream and fruit makes everything feel more intentional

Instructions

Blend the base:

Toss your chilled watermelon cubes and lime juice into the blender and let it run until youve got something smooth and impossibly pink. The sound of frozen fruit hitting the blades is one of summers great satisfactions.

Strain if you fancy:

Push that gorgeous puree through a fine mesh sieve if texture bothers you, though honestly Ive served it both ways and nobody has ever complained about a little watermelon pulp in their life.

Build the foundation:

Divide the strained puree among four tall glasses, aiming for about a half inch in the bottom of each one. This is where the magic starts gathering its ingredients.

Add the cream:

Drop one generous scoop of vanilla ice cream into each glass, watching it settle into the watermelon layer like its exactly where it belongs. The contrast of white against pink is absurdly pleasing.

The grand pour:

Slowly pour that ice cold lemon lime soda over everything, letting it foam up dramatically because half the joy of a float is watching the bubbles rise. Pour too fast and youll be cleaning soda off your table.

Make it pretty:

Tuck some fresh mint leaves against the glass and maybe float a watermelon ball on top if youre feeling fancy or photographing this for social media.

Serve immediately:

Hand out straws and long spoons because even though it looks like a drink, you will absolutely want to spoon up that melting ice cream at the bottom.

Pin It

My neighbor called them adult floats when she saw the setup on my patio, which I found hilarious because I watched her drink two with the same gleeful expression my kids have when the ice cream truck music plays. Sometimes the best things in life are just variations on what we loved at eight years old.

Choosing Your Watermelon

Ive learned the hard way that a heavy watermelon for its size is almost always the juiciest choice, and that yellow spot on the bottom means it spent proper time ripening in the field. The hollow thump test is real too though if you knock on five different melons in the grocery store like I do, people will definitely look at you strangely. Worth it for the perfect float base.

The Soda Selection

Club soda works if you are watching your sugar intake, but honestly, the sweet and tart thing happening with proper lemon lime soda is what makes this sing. I once tried fancy artisanal soda and while it was good, it did not hit that specific nostalgic note I was chasing. Sometimes you just need the classics.

Make Ahead Magic

You can absolutely blend and strain the watermelon puree up to a day ahead and keep it in a sealed container in the fridge. This makes party prep so much less frantic when everyone arrives thirsty and warm.

• Keep the blender pitcher handy in case you need to whip up a second batch
• Freeze leftover puree in ice cube trays for emergency watermelon treats
• The puree is actually spectacular in margaritas if you have extra

Pin It

Hot summer afternoons were made for drinks like this, and honestly, adult life needs more moments that feel like being eight years old again.

Recipe FAQs

→ Can I make these floats ahead of time?

For the best experience, assemble these floats just before serving. The ice cream will melt and the soda will lose its carbonation if prepared too early. However, you can blend and strain the watermelon puree up to 24 hours in advance—store it in an airtight container in the refrigerator until ready to use.

→ What type of soda works best?

Lemon-lime soda provides a classic flavor profile that complements watermelon beautifully, but you can experiment with different options. Club soda creates a less sweet version, while sparkling water adds fizz without additional flavor. For a fun twist, try fruit-forward sodas like strawberry, raspberry, or even ginger beer for a spicy kick.

→ Do I have to strain the watermelon puree?

Straining is optional but recommended for the smoothest texture. The process removes any fibrous bits or pulp, resulting in a velvety liquid that mixes seamlessly with the soda and ice cream. If you prefer a more rustic texture or don't mind some pulp, feel free to skip this step—the flavor remains equally delicious.

→ How can I make these floats dairy-free?

Simply substitute the vanilla ice cream with your favorite dairy-free alternative. Coconut milk-based ice cream adds a lovely tropical note, while almond or oat milk varieties provide neutral flavors that let the watermelon shine. Most lemon-lime sodas are naturally dairy-free, but always check labels if you have specific dietary concerns.

→ What other fruits can I use?

This versatile template works wonderfully with many summer fruits. Try fresh strawberries, peaches, cantaloupe, honeydew, or a blend of berries. Simply blend the fruit with a splash of citrus juice (lemon, lime, or orange) and follow the same assembly process. Each fruit creates a unique and refreshing variation on this classic treat.

→ Can I make these floats for a crowd?

Absolutely! Multiply the ingredients based on your guest count and set up a self-serve station. Prepare a large batch of watermelon puree in advance, provide scoops of ice cream in a chilled container, and let guests assemble their own floats. Set out garnishes like mint leaves, extra watermelon balls, or even colorful paper umbrellas for a fun interactive element.