When can Coturnix quail breed?

If you supplement their light and keep them indoors they will breed year round. If they are given a natural seasonal cycle they will lay/breed as long as their is enough daylight, so most of spring, all summer (though if you are somewhere that gets very hot they may take a break) and most of autumn before moulting and resting for winter. The males will crow at dawn and dusk when in breeding condition, otherwise they are quiet.

 

I got my first quail back in December. I was keeping them in my garage because of the snow I couldn't get a coop built outside for them where they are now. They were laying throughout the winter, but of course the garage was probably about 50 F and I had a lamp on them for a couple hours before the sun came up and a couple hours after the sun went down. I'm not sure cold matters as much as light. But I'm sure if it is freezing they wont lay at all.

 

I didn't have any light on mine, but they do it all year round.

 

This is correct. They need 14-16 hours of daylight to lay. Temperature is completely irrelevant. I know. I live in Michigan.