I hate to tell you, but the answer is yes, its winter.
My sheepies have been pilling through hay for a couple of weeks now, they start getting when the tupps go in. That day, 18th Nov, is when i think of winter starting, the last 6 years it was snowing when the boys went in so its a decent measure(this year it was shirt slieve weather a balmy 12C). I think of the hay rings as more than feeding for the now in early winter, it gives the girls something to stand around and do while big boys rush round and sniff meaningfully at thier hindquarters, it also gets them in the habit of eating hay so if/when we get a bad spell then they are already eating more than the grass.
You realise now they have got a taste for the good stuff your in trouble, they are going to demand it, and trip and eat you if they dont get it.