Go Back
Watermelon Mint Cooler

Watermelon Mint Cooler

Bright watermelon, cool mint, fizzy club soda — this Watermelon Mint Cooler sings summer. It tastes like a poolside nap in a glass and looks cute enough to make your guests ask for the recipe. Ready to make the easiest, most refreshing mocktail you’ll serve all season?
Print Recipe Pin Recipe
Prep Time 5 minutes
Total Time 5 minutes
Servings: 1
Course: Drinks, Mocktail
Cuisine: American
Calories: 35
Ingredients Equipment Method Notes

Ingredients
  

  • 2 fresh mint leaves plus more for garnish
  • Ice as needed (about 1/3 cup in the glass)
  • 3/4 cup watermelon juice see method below
  • 1/2 cup club soda chilled
  • Small watermelon slice for garnish
  • Vegan swap note: the recipe depends on whole plant ingredients so you stay 100% vegan without substitutions. If you want extra sweetness, add 1 tsp maple syrup but taste first — watermelon often tastes sweet enough.

Equipment

  • Muddler or small wooden spoon (for the mint)
  • Large cocktail glass or pint glass
  • Blender (for making fresh watermelon juice) or a juicer
  • Fine-mesh strainer (optional, if you prefer clear juice)
  • Measuring cup

Method
 

  1. Muddle the mint
  2. Place 2 mint leaves in the bottom of your glass. Press them gently with a muddler or the back of a wooden spoon. Don’t pulverize them; you want oils and aroma, not bitter bits. Ask yourself: do I want mint confetti in every sip? If the answer is yes, go harder.
  3. Add ice and juice
  4. Fill the glass about one-third with ice. Pour 3/4 cup watermelon juice over the ice. If you made the juice earlier, give it a quick stir before pouring.
  5. Top with fizz
  6. Pour 1/2 cup club soda on top for sparkle. Give the drink a gentle stir to combine the flavors. Garnish with a small watermelon slice and a mint sprig. I always add one more mint leaf for the photo — old habits die hard.
  7. Sip and enjoy
  8. Sip slowly or hand it to your friend and watch their expression change to "this is so refreshing." You nailed it.
  9. How to make watermelon juice (fast and clean)
  10. Method A — Blender: Cube seedless watermelon. Put about 1 cup cubed watermelon into a blender and pulse until smooth. Strain through a fine-mesh strainer if you want clear juice. Measure 3/4 cup for the mocktail.
  11. Method B — Juicer: Feed watermelon cubes through your juicer and measure.
  12. Tip: Chill the watermelon beforehand for extra crispness. I throw chunks in the freezer for 10–15 minutes if I forget to chill — works like a charm.
  13. Wondering about seeds? Remove them, or blend and strain — either way works. I usually skip straining because I like a bit of pulp.

Notes

Make-ahead & storage tips

You can prep the watermelon-mint juice up to 4 days ahead. Store it in the fridge in an airtight jar. Keep the club soda separate until serving so the fizz stays alive. If you assemble the mocktail early, expect some watery separation as the watermelon releases liquid. Drain or stir and serve chilled.
Party hack: make a pitcher of watermelon-mint juice and keep chilled. When guests arrive, assemble glasses with ice, juice, and soda. You’ll look organized and like you planned a whole vibe.

Nutrition Info (approximate)

  • Calories per serving: ~35 kcal (mostly from the watermelon juice)
  • Carbs: ~9 g (natural sugars from watermelon)
  • Fat: ~0 g
  • Protein: ~0.5 g
  • Allergens: Nut-free, dairy-free, soy-free, gluten-free, egg-free