they can hatch any month of the year. I just had a clutch of lessers that hatched 12/11/09 and my first clutch hatched in June, these all started the breeding season at the same time. just did a trade for a piedbald that hatched 12/30/09. hasn't even gone thru his first shed yet. go with what you been told, close enough, when the snake gets older you won't be saying an 5/09 snake. it will be an 09 snake. But many do hatch around June to Aug. Snakes also hatch out in May. hope this helps you some. Don