Key Takeaways
- Visible mold or fuzzy patches on cut watermelon mean it should be thrown out, as mold can spread beyond what you see.
- If the watermelon smells sour, fermented, or unpleasant, it’s spoiled and should not be eaten.
- Slimy, slippery, or sticky watermelon flesh indicates it has gone bad and should be discarded.
Watermelon is a hydrating, refreshing snack, but it doesn’t last as long once cut. Knowing the signs that it has gone bad can help you decide when to toss it and keep it fresh longer.1
1. It Has Mold
Visible mold is one of the most obvious signs that it’s time to toss your cut watermelon. Keep an eye out for fuzzy, white, green, gray, or dark-colored patches of mold that start to develop on your fruit.2
It’s also important not to cut off moldy sections and eat the rest. Because mold can penetrate softer, high-moisture foods, like fruit, beyond the visible area, experts recommend discarding moldy watermelon rather than trying to salvage the rest.3
2. It Smells Sour
Fresh watermelon typically has a mild, sweet smell. If yours has developed a noticeably sour, fermented, or unpleasant odor, that’s a common sign of spoilage.2
And when in doubt, don’t taste it to find out. Food safety experts caution against tasting any food that smells questionable and suggest throwing it out instead.4
3. It Has a Slimy Surface
Freshly cut watermelon should feel firm, crisp, and juicy. If you notice that the watermelon flesh develops an unusually slimy, slippery, or sticky coating, it’s a sign that the fruit is past its prime and should be discarded.2
Note that a little extra watermelon juice collecting at the bottom of the container isn’t necessarily a problem on its own. However, if the flesh of the fruit itself has developed an abnormal film or texture, especially along with an “off” smell, you should avoid eating it.5
4. It Feels Mushy
Watermelon naturally softens as it sits in the refrigerator. A slight loss of crispness may mean the fruit isn’t at peak quality anymore.6 However, there’s a difference between slightly soft cut watermelon and flesh that’s excessively mushy or deteriorating.2
Spoilage microorganisms can cause foods to develop noticeable changes in texture, odor, and taste, so it’s important to throw out your cut fruit if you notice a significant deviation from its normal consistency or texture.7
