I remember talking about this a while back, as I've thought a lot about winter as well. I keep telling my husband we need to start getting hay now before it gets really expensive.
We have 10 goats right now, and may have babies around Christmas <not really ideal....>. We'll buy about 4 large round bales, and as many square bales as we can fit in our sheds and the top of their barn.
The round bales are real nice to have, but you have to make sure they don't eat from the bottom and it fall over on them! We put ours on a pallet, cover it with a tarp, and my husband also put chicken wire around it so they are forced to eat from the top vs. eating from the bottom. When a bale gets broken down, we'll tear it apart and have pallets arranged like a box in our back stall, and all the loose hay from the round bales go in it, and that's what I fill up their hay rack with.
We don't have alfalfa right now, timmothy/mix is what we have, but we'll end up getting alfalfa to mix with the timmothy rolls and keep that in the hay racks. We figure this will give them plenty of nutrition from the hay.
Of course they'll all have their grain in the winter.
I am ready for the summer heat to go somewhere else, but admit, I am NOT ready for winter.