I have spaghetti squash that appeared ripe. Nice yellow color, vine dying back. I brought them in, washed them off, dipped them in diluted bleach and left them in the garage. (I did this last year and they lasted many months.) Now they are turning green again. I've planted spaghetti squash several years and never saw this before. Should I return them to sunlight?
Spaghetti Squash Turning Green
Certified GKH Gardening Expert
It does sound as if they were not quite ripe to be picked from the vine.
This article does a very good job and helping you determine if and when the squash is ready to harvest.
Find a nice sunny spot to put your squash in, this should help them ripen further off the vine.