How do I tell if my watermelon in my garden is ripe?

[ixthus_km]

Growing watermelon for the first time. They look good, but I have no idea how to tell if they are ripe. I know how to pick one out at the grocery store (tapping on it and all that), but these are a small variety, and I don't know how to tell ripeness on the vine. Suggestions?
Thanks!

[ranger_co_1_75]

It is ripe when the vines lets go of the melon when you gently tug on it. If the vine won't let go of the melon, it isn't ripe yet.