You should still cut up your watermelon, or freeze it, within two weeks of buying the whole fruit.
For example, if you’re going to use the frozen watermelon in smoothies or to make ice cream, cubes are best. Cubing watermelon is best if you’re planning on just snacking on it. Thawed watermelon will be softer than fresh watermelon, though, so keep that in mind as you freeze it. You can also freeze the watermelon in slices if you’re short on space on in your freezer. Sliced watermelon will stack more easily than cubes.
