Unripe Butternut Squash
Can you pick butternut squash if it is not tan yet and will it continue to turn colors?
Certified GKH Gardening Expert
It is best to leave the squash on the vine as long as possible to allow it to mature. You can pick it earlier and finish it off, but the flavor will never be as good.
The squash fruit can take a light frost, so try to leave them on the vine until after the first light frost.
After that, if you still need to ripen the squash, this article will help: