I grew my first rain lilies this past year. I live in the Sacramento California Area where it barely gets down to freezing. I stored my one pot out on the front porch during the winter. The porch has a roof, but is open to the weather on one side. This way the pot didn't get rained on and did not experience any frost, due to the roof over the porch. They received very little water during the winter, but the leaves remained. It wasn't until spring that the leaves died back. I started watering them again at the beginning of July and they bloomed all at once within just a few days. This is consistent with Liberto Dario's notes on growing these in a Mediterranean Type Climate.