I am going to put mine in a little early this year. I usually wait until the end of May, but we haven't frosted in weeks, and the next 10 day forecast has the night time lows in the high 40's, with days in the 70's. I am out of school the 16th, so I plan on getting them in the ground as soon after that as possible.
All of my tubers have been "potted" up for a while now. There are still a few that haven't broken the soil line, but most are flourishing and a few are 10-12" tall.
