I have not checked my dahlia tubers in probably a month or so. I should probably go into the attic and give them a good looking over. Last I checked them, they all looked great.
I typically bring them out of the attic, when the attic starts to warm up some and then they are in the house a week or so before taking them outside to plant. I like to get them into the ground by Memorial Day. There have been some years, where it has not been until the middle of June that the tubers did not get into the ground.
I would love to have a greenhouse to get them started during the month April - May is such a busy time trying to get everything else ready to go out into the garden and I just don't have the room in the house to start my tubers. I suppose I could commandeer the dining room table, but DH already thinks that I have taken over the rest of the house with all my houseplants