I know our first frost was in October some time ago, and we've had lots
of hard freezes since then. All the tomato plants are long dead, and most of the fruits are flat, soft, and/or and drained and dried (including the green, unripe ones). However, my Galapagos Island tomato plant (also long dead) had a number of fruits on it that look and feel good enough to eat! (I'm not planning to actually eat them, btw.) You wouldn't know they'd been frozen. Anyway, I'm wondering if the seeds I plan to save from them will sprout and whether this freeze-resistance will be genetic.
Here's a picture of them I took minutes ago (all but one or so were still attached to the dead and mostly dried up plant):
There were plenty more from the same plant that were softer than these, but otherwise were similar.