Your description does not sound like cold damage to me and honestly, 40 isn't all that bad. Not ideal of course but tolerable. The description sounds much more like either over-watering or some sort of nutrient issue to me. Can you post a pic of the plants in question?

It also doesn't sound like any diseases so the link posted above to generate personal blog hits serves no purpose.

Dave

I think they are goners ,better start again

Hi, I know 40 doesn't sound that bad, but it could have gone lower and probably did maybe for 3 nights. They were fine when they went in, only one week and did get possibly two inches of rain but very moderate and slow. The yellowing is all through the leaves bottom to top, kind of in a mottling or along the veins a fairly small proportion of the leaves, not the whole leaves. Sorry I don't have picks. I would assume they'll make it, but I know they are weakened and am afraid that will carry through and affect long term. It would cost $6 - $10 to replace them not too big a deal, but I would hate to throw the ones away. Thank you.

Then it is basically your choice. Still sounds like nutrient deficiency to me and a good feed will bounce most right back but can't say without seeing them.

Dave

It looks like they're going to stay in, the new growth looks good so I guess they'll be fine. I think it was a lot lower than 40 and for maybe 3 nights. I've got one Rutgers in the bunch and I'm looking forward to seeing how she does. Thank you.