Just as a followup for anyone looking for info...
Two of the gourds (the nicest ones, actually) I brought in before the freezing temps; they are still sitting on the shelf, green as can be. The rest I left hanging on the trellis for 2-3 weeks, through the freezing weather, until I "got around to" bringing them in. All of those almost immediately started to develop mold on the outside, but not one of them actually rotted; once the mold was scraped off and the outside scrubbed up, they were perfectly solid. So -- beginner's luck, maybe, to have no loss from rotting?
As for the 2 green ones... just a few weeks ago I put them out in my greenhouse for about a week, to see if the freezing/thawing temps would hasten the curing process, but as of now they are still green. Other than just letting them sit there and eventually do their own thing, I have no idea what else to try.
