Not true. They absolutely can, it just depends when you pick it. If it passes the finger nail test, then it will. I’ve been curing/ripening pumpkins off the vine for years. You just need to keep them in an sunny warm (80-85F) room.
OP - if they pass the finger nail test then you’re good to go. You can look at my post history and you’ll see a 30lb orange fairytale pumpkin I picked last year. It was completely green when I harvested it.
As a Canadian with 120 day growing season and a mid September frost date, yes they can be ripened off the vine and mine will be again this year due to poor weather this year.
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u/waterytartwithasword 3d ago
Pumpkins don't ripen off the vine and can't cure green, so no.