Tonight it is going down to 4 degrees. A bit unseasonalbly cold for this time of year, we normally don't get these temps until mid January. I have decided to bring the potted asparagus into the garage. It is sitting below the glass block windows so it will still get some indirect sunlight. Being in a container it has already frozen solid and doesn't have the protection of being in ground. The leaves have begun to die back so I figure it's ok to bring it in since it has gone dormant. I will put it back out once temps raise back up into the 30s and 40s regularly in a couple of months.