Re: It's going to freeze! :-/
This is probably reaching you a little too late for tonight, but hopefully it might help you or someone in the future… What you should be most concerned about is new growth such as flower buds on the Hydrangea macrophylla, newly transplanted seedlings that weren’t quite hardened off and any warm season annuals and/or houseplants that you might have put out a little early. Think especially about any plants that are borderline for your zone- if any of these are pushing buds or flowers they will need to be protected, or you will loose the flowers and fruit. Also make sure you water everything well- this really helps the plants withstand the cold temps. Good luck!