well if they being shipped and over night you should bea able ot get them before the temps become an issue, I also think it possible to have an small ice pack t okeep the snakes cooler if it warm were they are leaving from. I found the package is cooler when i open them than the air temp ( in summer ) I guess the overnight temp helps keep the box cooler for the first half of the day. ( not like they in direct sunlight from sunrise on . )