If You Open a Watermelon and See This

Other Signs Your Watermelon Has Gone Bad

Foam is one of the most obvious indicators, but it’s not the only one. Watch for these warning signs:

• Sour or unpleasant smell: Fresh watermelon should smell lightly sweet, never sharp or acidic.
• Slimy or mushy texture: Flesh that feels slippery or overly soft is breaking down.
• Fizzy or tingling taste: A carbonated sensation points to active fermentation.
• Dark or sunken spots: Discoloration or depressions inside the fruit often signal decay.
• Cracks in the rind: These openings allow bacteria and air to enter, speeding spoilage.

If you notice any of these, it’s best to play it safe and discard the melon.