I feed mine once a day but I'm betting my temps don't get as cold as yours, so you might consider just feeding what they can clean up right away and do it twice a day. Others have resorted to heated dog dishes for keeping the FF from freezing.
My current layer flock and also the rooster pen just eat the FF until it's gone and that takes under 30 min. so mine is not getting a chance to freeze. They are staying incredibly fat on just that amount...for the layers I have 9 in the coop and they are cleaning up 3 c. and the rooster pen holding 14 birds are cleaning up 6-7 c. per day. I saw everyone running today when I had a rooster jail break and everyone is WAY too fat on that ration so I could even cut that amount and still have a well fleshed out flock of birds.
***Thanks Bee! Just bought the biggest heated bowl I could find. 5.5 qt. I've got 19 LF & 3 standard hatchery birds. I'm guessing filling it full 2X/day should do it. Will monitor how it goes.
