Last 2 nights the weather called for frost in my area (upper michigan). I wasn't awake early enough to see if there actualy was any. Anyhow, here's a technique I use to protect my plants: I will go out after midnight and wet all of the foilage down really good. I figure if the plants are all wet in the morning then the frost won't touch them. By doing this I think I can hang on for a few more weeks until they freeze.