Look for the yellow spot: Watermelons develop a splotch where they rest on the ground. When this splotch is creamy yellow, it's ripe. Give it a thump: Tap the underbelly of the watermelon. A ripe one will have a deep hollow sound, which means it is brimming with juice and at the peak of its ripeness.

How can you tell if a watermelon is ripe?

A ripe watermelon will feel sturdy and have a resonant, satisfying hollow sound. That means it's bursting with watermelon juiciness and is at its peak of ripeness. If the thwap is dull sounding or the fruit feels soft, pass on it.

What color is a watermelon when it is ripe?

“Ripe watermelons normally develop a yellow color on the 'ground spot' when ripe,” Upham said.