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+ servings
watermelon syrup in a jar with two whiskey watermelon sour cocktails

No-Cook Watermelon Simple Syrup - The BEST watermelon syrup recipe for cocktails

Heather Wibbels
Use this no-cook, cold process watermelon syrup recipe to make a bright, flavorful and fresh-tasting syrup to punch up the flavors in all of your summer cocktails. It just a quick muddle and a night in the fridge to get you to the best fruit-infused simple syrup you have ever had.
5 from 7 votes
Course Drinks
Cuisine Bourbon Cocktail
Servings 12


  • metal sieve
  • measuring cup
  • glass jar


  • 16 oz fresh, cubed watermelon
  • 8 oz sugar
  • ½ oz vodka optional - it keeps the syrup fresh much longer


  • Combine watermelon and sugar in a jar or a zippered plastic bag.
  • Muddle them together a bit and put the bag or jar in the fridge.
  • After 12 to 24 hours, stir up the contents until all the sugar is dissolved.
  • Strain through a metal sieve.
  • Store the watermelon syrup in a clean glass jar in the fridge.
  • Optional: add ½ oz vodka to the simple syrup to help it last as long as 4 weeks.
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