11 degrees on Monday! Holy smokes! A lot of people are going to have their gardens wiped out.
I had a garden there for a few years, and we had some cold snaps. But even so, the ponds never froze over: the ground stayed warm, and the cold temperatures passed quickly. If folks have a way to keep their water circulating, everything should be fine. As far as I can tell, it's only going to stay below freezing for about 36 hours, and that's not enough time for the ground to lose its heat.
Funny story: I once flew from Houston (in the summer) to San Diego for a wedding. Everyone at the wedding complained about the humidity. In San Diego. Near the shore.
I mention this because sometimes weather is relative. I imagine everyone in Texas thinks the sky is falling, but here in DC, we're jealous of your ten day forecast!
Thanks,
Bill