Got it. Figured it was covered somewhere in the 100 pages and I did a quick (not very thorough) search but didn't see it.
While I got you here, my first horde night had zero zombies. I'm set up next to the trader and heard a few gunshots to start the night so maybe they got the first wave but there was nothing after that.
Also, I just got attacked by a radiated zombie (maybe 5 in the morning, day 12) and while fighting it, the console popped up with the message "NullReferenceException: Object reference not set to an instance of an object." I cannot close the console or control my character and the zombie is running in place.