Wanted to state for any fellow worrywarts searching for answers—Coturnix on the ground can handle freezing temps. They huddle together at night (when it's in the teens here), but are otherwise active during the day. Tarp up their enclosure (with ventilation!) to keep the wind off and give them fluffy bedding. I shouldn't have worried—they do better in the cold than in the heat.
No clue how they deal with sub-zero temps, but I'm at least certain that they can make it through a Southwestern Idaho winter just fine.
No clue how they deal with sub-zero temps, but I'm at least certain that they can make it through a Southwestern Idaho winter just fine.