Thanks for the storage tips. I'll put those to good use because we have many green tomatoes now.
We've lacto-pickled them before and avoided any that had even a blush of red, per instructions read online. Green tomatoes make very good pickles, but you can't eat only pickled foods so it will be good to store some while they ripen.
Question: when you say if they stay out in the cold too long you won't be able to get them to ripen up, do you mean even if you bring them inside? The long period of outside cold affects them so they won't ripen even indoors?