Same here. Traditionally May 31 is the 'plant out' date. Sometimes I have pushed it a little, not due to any intelligent reason, more due to impatience to get them out of the garage or off the back porch. Much easier to care for.
I have some small tubers putting up tiny 1" plants. I am thinking I will plant those in a large pot and hope for an increased tuber for next year. I don't think they will have the energy to produce much of a flowering plant this year.