Check if your watermelon is still fresh for eating by inspecting, slicing and smelling the watermelon. Watermelons have a shelf life of seven to 10 days, or two to three weeks in the refrigerator. After the melon has been cut, however, it beings to go bad quickly.
- Inspect the watermelon
Carefully examine the outside for signs of mold and dark-colored spots, which could be an indication the inside is rotten.
- Slice the watermelon
Cut into the watermelon. The inside should be deep pink or red in color. Otherwise, do not eat it.
- Smell the watermelon
Bring the watermelon close to your nose and sniff it. If it has a tangy or sour smell, throw it out.