Monster butternut squashes but they're still green

[Anonynonny]

Will they ever go yellow?

They are massive. At least double the size of the average big butternut squash you get in the supermarkets. Why are they still green? Can I harvest them or will they taste horrible? They are already enormous - one of them is 16 inches long (yes I measured it! )

Bump

What variety are they? (Just wondering if they might be a green variety ) In any event, under-ripe squash taste perfectly good - but they won't store so well.