Here is a quote from the Rolling Plains Quail Research Ranch:
Brrrrrr . . . I'd hate to be a quail over the next several days. It's deja vu Dec 1983, which is the coldest extended weather period I've ever experienced. Forecasts call for ice, snow, and low temps around 0 degrees F on Sunday and Monday nights.
Hopefully your quail have access to high quality thermal cover (e.g., junipers, tumbleweed-laden fencerows, plum thickets) and carbs to stoke their fires (energetically). This kind of weather at this time of the year, is about as bad as it gets for quail. Much of the grass has disappeared and seed supplies are at their seasonal lows. And when your crop is empty, you're forced to venture longer into the "landscape of fear" where predators have your number.
If you use supplemental feed, ensure your feeders are full or if broadcast feeding spin a few more seconds in the "honeyholes." I filled my deer feeders in OK last month with milo, then set the timer to spin only 2 seconds twice a day. Right now, I wish every deer feeder in TX followed the same protocol.
If you've got a game camera, set them on your feeders and see just "who's coming for dinner." You'll likely be amazed. Share any good pics you get with us.