We brought our Costco watermelon home and set it on the kitchen counter when it started foaming.

Imagine this: you excitedly bring home a massive watermelon from Costco, ready to enjoy its juicy sweetness. You set it proudly on the kitchen counter, anticipating refreshing slices or vibrant fruit salads. But then… it starts foaming . Foam? From a watermelon? What could possibly be happening?

HomeWe brought our Costco watermelon home and set it on the kitchen counter when it started foaming.
We brought our Costco watermelon home and set it on the kitchen counter when it started foaming.
Imagine this: you excitedly bring home a massive watermelon from Costco, ready to enjoy its juicy sweetness. You set it proudly on the kitchen counter, anticipating refreshing slices or vibrant fruit salads. But then… it starts foaming . Foam? From a watermelon? What could possibly be happening?

Let’s dive into the mystery behind your foaming watermelon and uncover what went wrong—and how to prevent it in the future.

We Brought Our Costco Watermelon Home and It Started Foaming 🍉⚠️
When a watermelon begins foaming, it’s usually not a good sign. While rare, this phenomenon can occur due to several reasons—most of which point to spoilage or contamination. Here’s why your melon might have acted like a science experiment gone awry:

1. Signs of Fermentation
Watermelons naturally contain sugars that, under certain conditions, can ferment. If the melon was left unrefrigerated for too long or had cracks/bruises allowing bacteria to enter, fermentation may have begun inside. This process produces gases and foam as microorganisms break down the sugars.

How to Tell : A sour smell, unusual softness, or visible mold are red flags alongside foaming.

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