It depends what state your in, your not in Connecticut beacuse cultivation is illegal, however I have a bit of experience growing outdoors in New England, in Connecticut I would start my plants mid April and put them out after memorial day as that is the date when there is no possibility of frost and you want your plants to be small plants so they can handle the elements, if your in mass I would put them out after may 31frst, if your up in Maine and I have grown there too you have to wait longer I think we used to put them out after June 15th, that's central Maine it still cold up there and mud season.