can I pot on pumpkins and squashes for planting out later in June

My pumpkin and squash plants are in modules still in the greenhouse and the roots are now coming out of the bottom of the pots.  Every year I seem to plant them out to early and last year they didn't grow at all! the weather is terrible here at the moment with heavy rain and wind - so can I pot them on again and keep them in the cold frame until the weather improves or will this do them more harm than good.

I hope so, because that is exactly what I've been doing today.