You could always pick them up and keep them going under a few cfls or something until you can put them in the ground. I dont put anything into the ground until it is about 6 inches at least, if the clones are already rooted and at that height they can go in right away, after the rain of course. Why wait until may 1st? The sooner they are in the sun the better. Being 6 inches already on may 1s t they will be some big girls, my white rhino didnt get started until may last year, from seed, it was in the woods in almost complete shade for about 2 weeks, then got moved into the sun, and it still grew to be 7 feet tall. Which isnt necessarily big, but for starting late, and being in bad conditions for a few weeks, not bad.