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• Method 1 of 3: Recognize signs of deterioration
• Method 2 of 3: Determine freshness by date
• Method 3 of 3: Extending the shelf life of watermelon

Watermelon is a delicious summer snack, but for your health it is important to know if a watermelon is no longer good. One way to find out if a watermelon is no longer good is to check it for mold or a bad odor. You can also use the expiration date to find out if a watermelon is no longer good.

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Method 1 of 3: Recognize signs of deterioration

1. Check the outside for mold. Mold or dark spots on the outside of the watermelon can indicate that it is no longer good. The fungus can be black and hairy.
2. Look for a healthy color on the outside. The watermelon should have either a consistent green color or a striped appearance. Striped watermelons have alternating lime green and dark green stripes.
3. Look for a dark pink or red interior. These colors indicate that the watermelon is healthy. If your watermelon has a different color (for example black) you should not eat it.
   • Different types of watermelon have different types of insides. Desert King, Tendergold, Yellow Baby, and Yellow Doll watermelons have yellow or orange flesh.
4. Beware of gritty and dry watermelon flesh. When a watermelon is no longer good, the crunchy flesh will start to shrivel. The pulp can even pull away from the seeds. In other cases, the watermelon can become slimy and soggy.
5. Smell the watermelon before cutting it. A healthy, edible watermelon should smell sweet and fresh. If it smells pungent or sour, it is no longer good and should be thrown away.

Method 2 of 3: Determine freshness by date

1. Uses the expiration date. When you eat pre-cut watermelon that you bought from the supermarket, the package should have an expiration date. This date will let you know how long you have left before the watermelon is no longer good.
2. Eat sliced ​​watermelon within five days. If properly packaged, sliced ​​watermelon will keep for three to five days. Make eating it a priority so it doesn't go bad.
3. Eat uncut watermelon stored out of the refrigerator within 10 days. After about a week, this watermelon will start to spoil. Eat uncut watermelon stored out of the refrigerator as soon as possible.
4. Do not eat uncut watermelon stored in the refrigerator after 2-3 weeks. After about 2 weeks, the watermelon will start to spoil. To make sure that your refrigerated, uncut watermelon goes bad, eat it within 2 weeks of purchase.

Method 3 of 3: Extending the shelf life of watermelon

1. Store the whole or sliced ​​watermelon in the refrigerator. Normally, watermelons are kept in a refrigerator where the temperature is 13 degrees. When you store fruit at 21 degrees Celsius, the amount of lypocin will increase a beta-carotene (both are important antioxidants).
2. Store sliced ​​watermelon in an airtight container. Resealable packaging is best for watermelon. This preserves the flavors and keeps it fresh.
   • In slices, wrap your watermelon tightly in aluminum foil or plastic.
3. Be careful when freezing watermelon. Some people advise you not to freeze your watermelon whole, because when you cut it open all the juices will run out. If you decide to go crazy and freeze your watermelon, pack it in an airtight container or special freezer bag. The watermelon will keep for 10-12 months.