Brrrr for you, Sherwood. I doubt a couple nights of freezing temps would get down deep enough to destroy the tubers. If they feel firm and skins are intact, they should be good.

Spring division is an option and easier to see eyes poking out. If you plant the whole clump you'll have many stalks, a bushier plant that is more difficult to support but with more flowers and tubers that keep right on reproducing underground making division even tougher as each year passes. Over time the flowers become weaker and fewer. It's really not that hard to divide every year or two. After that, it gets more challenging as the clump grows and tightens.

You can see examples of 1,2, and 5 yr clumps at the link below. Also photos identifying eyes and approximations on where to divide into single tubers. Practice, practice, practice makes it easy in no time at all.

Here is a link that might be useful: Dividing dahlia photos showing eyes/cuts

Thanks for the tip. That's what I'd figured. Looking at them there is no sign of weeping or bruising like you'd get from a frozen potatoe. They are drying a bit now. Tuesday I'll pick up some sulfur fungicide and store them up.

I ended up with a bumper crop. 3 milk crates of good sized tubers from a single packet of seed.