@CindiKS, Cindi
>>>> What do I do with the 50 kajillion bags of plants I have sitting on the lawn?
This suggestion may get to you too late to do anything right now, but you may experience more cold weather before you all of those plants back into the ground, so it may help.
The answer to your question is to make BIG clusters of the plants. Bag some of your mulch to put in the gaps between the plants and to tie around the cluster. It is harder to freeze a large mass than a smaller one.
I have had to change from warm clothing to cooler clothing and back to warmer clothing all this week because the swing between our night temps and day temps has been 30 to 40 degrees. It's cold at night and in the morning, but warms up for several hours during the day. I am still sleeping under my winter blankies ....
Smiles,
Lyn