I think snow "cover" is key. My daylilies suffer the most over the winters that we don't get a lot of snow cover. I have bark/mulch on my daylilies (not super heavy) and although I don't have any of the ones on your list, I do have some evergreen and quite a few semi-evergreen. I have never lost any. Giving them some kind of mulch protection will definitely be a plus, especially being their first year. Best of luck, they are all beauties!!
