Start with the watermelon’s overall appearance.

A mature watermelon generally has a relatively dull, firm rind rather than an unusually glossy surface.

The exact shade of green varies considerably between varieties, so don’t rely on “dark green” alone.

Instead, look for a healthy, intact melon without soft areas, deep cuts, cracks, or obvious damage.

Check the Field Spot

One of the most useful visual clues is the field spot—the area where the watermelon rested on the ground while growing.

Look for a noticeable creamy yellow or buttery-yellow patch.

A very pale or nearly white field spot can sometimes indicate that the watermelon was harvested earlier.

Because watermelons don’t continue ripening significantly after they’re picked, harvesting at the right stage matters.

Pick It Up

Weight is another useful clue.

Compare watermelons of roughly the same size and choose one that feels particularly heavy.

Watermelons contain a tremendous amount of water, so a dense, heavy fruit is generally preferable to one that feels surprisingly light for its size.

It should also feel firm all around.

Avoid melons with soft or sunken areas that could indicate damage or deterioration.

Don’t Put Too Much Faith in Internet Tricks

You’ve probably seen advice telling shoppers to choose watermelons based on web-like scars, perfectly symmetrical stripes, stem shape, or the size of a small circular mark at one end.

These characteristics can vary because of watermelon variety, growing conditions, pollination, and other factors.

They aren’t dependable shortcuts for determining sweetness.

Even the famous “knock test” isn’t perfect.

An experienced shopper may use the sound as one additional clue, but judging ripeness from a tap alone can be difficult.

Use Several Clues Together

Instead of searching for one magical sign, make a quick overall assessment.

Look for a firm, healthy watermelon with a dull rather than excessively shiny rind, a creamy-yellow field spot, and good weight for its size.

It still won’t guarantee the sweetest watermelon in the pile.

Growing conditions, variety, and when the fruit was harvested ultimately influence what’s waiting inside.

But those few seconds of inspection can improve your chances.

And when you’re carrying several kilograms of watermelon all the way home, they’re probably worth taking.