How to Tell If a Watermelon Is Ripe


When to Harvest Watermelon

Robin Sweetser
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Every year I am faced with the same dilemma: how to tell if a watermelon is ripe. Muskmelons are easyβ€”they will slip right off the vine at the peak of perfection. However, watermelons remain firmly attached even when they are overripe.

I am no good at the "thump" test. Old-timers swear that they know when a watermelon is ripe just by rapping it with a knuckle. If the sound is low-pitched, hollow, and deep like a drum it is ready. Johnny's Seed Company explains further to say that it should sound like "punk" rather than "pink" or "pank" when you flick it with your finger. I have failed miserably at this test in years past, picking unripe melons that are still white inside. Once they are detached from the vine watermelons won't continue to ripen. You only get one chance to do this right.


When all else fails I guess I should look at the seed packet. It says that my Sugar Babies should be ripe in 80 days from planting and though we started the seeds indoors in early May they did not get planted in the garden until early June. I think they should be ready any day now but since they do most of their ripening in the last 2 weeks of growth, it is important not to jump the gun.


Tricks to Tell if a Watermelon is Ripe

Here are other subtle cues to look out for:

  • The green color becomes dull.
  • On a striped melons, the color between the stripes gets darker.
  • The rind will get hard.
  • The blossom end will soften.
  • They will stop getting larger.
  • The ground spot will turn from white to yellow.

My Sugar Babies don't have a ground spot.

  • The end of the main vine nearest the fruit may start to crack or turn brown.
  • The curly tendril on the main vine, closest to the fruit, will turn brown.

Curly tendril is still green!

Do you have any tried and true method of determining the ripeness of a watermelon that you'd like to share?

See more about harvest watermelons on the Almanac's Watermelon Growing Guide.

After that curly tendril finally dried up, here is the result: a perfectly ripe watermelon!


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