I would definitely protect them from hail. They aren't any tougher than your veggie garden I'd think. Now, I've never had my orchids hailed on, I am more concerned by sunburn here once it heats up. I just put mine in the shade under the trees in the front yard (mostly they stay in the house actually). Would having them under a tree canopy protect them from hail? Does it hail once summer starts, or is that a spring/fall thing?