If you have a unheated garage, take large nursery pot and put your lilies in there mixed with moistened peat moss. Keep them in the dark and cold (below 40F). Once they begin to root and sprout, plant out ASAP!

You can also individually pot up your bulbs so you don't have a hard time untangling roots and shoots when you're ready to plant. Just make sure they're in a fast draining potting mix and well watered before going into the cold garage!

Good luck!

Riz

I got tired of squirrels digging up 1/2 of my fall-planted lilies, so I planted each bulb in a one gallon pot with potting soil, putting it at the bottom. I kept them overwinter in an unheated but non-freezing garage, then I waited to plant them out until they were coming up and several inches tall. I handled them carefully and didn't have any problems, so it was nice to plant all of them except 1 that didn't come up instead on losing so many to squirrels.