I have bobs and they winter fine with the snow and all.
I have eggs in the hatcher now that are jumbo Coturnix.
After reading that they migrate to Africa in nature for the winter I started wondering... Do they winter well outside or do they need to be housed over winter? The weather here gets to -20 occasionally and usually has 30 inch of snow over the winter season. normal lows are 0 to 12f for a couple months. I'm on the 42 parallel approximately.
I housed all my coturnix quail outside, they managed just fine in the winter weather.