Yes, I'd move them. Frances Williams is very temperamental and burns EASILY even in shade. Move them, give them LOTS of water and hope for the best. If you need/want to replace them eventually, go with Olive Bailey Langdon. It looks like Frances W, but doesn't burn like FW.

Char

About 5 years ago I lost the tree that shaded my hostas....well at least some of them. FW was among those now in 3/4 day sun and full southern exposure. I watered like crazy ( also in that bed were August moon, Royal standard, Axiom, Krossa Regal and some other stuff.) and everything got brown edges and some bleached out....but everything grew like crazy! I never saw hosta increase in size as fast....huge!
I lost some important shade in the ice storm in Februrary....and while the newly sunny hosta are looking a little pale they are getting new eyes at a record rate.
Water! Water some more and then again.
Your FW should be getting bigger...but also sunburning as well.
Linda C

I have two FW's in *western* afternoon sun and they are champs and really not looking badly at all. The "burn" that FW is so notorious for is spring dessication, not sunburn.

I'm not saying that their location now is the most ideal but I would highly doubt that sun is the root of the declining issue if it is only Z4 and 4 hours a day.

Thanks for the responses!
Going with the majority I am not going to move FW- I will just increase her water intake and hope for the best.
I am begining to wonder if they just 'look' smaller since the tree is gone. I don't know - maybe I'm just crazy.
Char - I do have a Olive Bailey Langdon (and a cat named Bailey to go with it) When the tree people were here they ran over it- smashed it six inches into the ground. It took me three weeks to find it again - then by accident as I was planting Appalachian Beauty and found a hosta root that I followed to OBL. I have now moved her to a safer location as we will have to have the tree people back again sometime next year.

Thanks again Everybody
Kris