Surprise Acorns

No I am not talking about this surprise acorn. Although we do find these little surprises dotting our landscape. The squirrels are generally very generous with their acorns. The squirrels must think this is their version of the easter bunny as they bury their acrons all over the garden. We find them when they are about this size and pull them. If not we would have a forest of Oak trees. I am not sure what kind of oak this is but I am letting one grow where one of the pine trees used to stand. Thank you Mr Squirrel but enough is enough.
The acorn I am surprised and most delighted to find is the one that sends up these beautiful yellow blooms. I first saw this bloom a couple of weeks ago...in the compost pile. I was quite excited as I knew it was some kind of squash. I just didn't know what kind it would be. I like Spaghetti and Acorn squashes.
A few days later I got a hint of what was to come. It has been fun anticipating the fruit of this vine.

Whoo hooooo it is gonna be an acorn squash.
Now this is my kind of veggie gardening. No preparing of the bed, no planting of the seeds, no fertilizing or bug picking. Yep I feel very blessed with this small crop of acorns. The only problem with this screnario is that I don't know when to pick them. Can anyone give me a clue? Do the vines dry up? I am thinking it won't be long. Can I leave them on too long? I am just beside myself because I don't know when to pick. I don't want to pick too early or late and not get to enjoy these little squashes.
I would probably have more of these little beauties but Vinny kept running over the vine as it is in his path to go bark at the neighbors dog. Sigh~~ I would really appreciate any tips you could tell me about harvesting these squashes.