Yes, it does. I guess since it's already so sour it doesn't get more sour? Or it's so processed it goes bad slowly? I don't pay attention to the dates anyway, those are arbitrarily decided by the manufacturer. When it's clumpy, it's bad, LOL.

Annie

I find the same thing with buttermilk. If one of our skimpy local stores even has any at all. I do have a friend who drinks it like beverage and I will usually take what I need and give the rest to him.

I've bought the powder and keep that on hand but it's not the same as fresh! I don't particularly enjoy the taste or texture other than in recipes so I don't know if I'd trust myself to know if still good kept in the refrigerator well past the use by date or not! You give me hope.

Dairy keeps really well in my fridge, but things like sour cream and yoghurt best, of course. Milk that comes in glass keeps well too, so the buttermilk in paper less so. I considered chucking mine while cleaning the fridge today, but I'm hoping it'll last until New Year's, when I might make biscuits. :) Buttermilk powder goes in my whole wheat pie crust recipe, sourdough waffles and sourdough buns, but I wonder how it would work (rehydrated) in biscuits?

I've never had yogurt or sour cream keep as well as the buttermilk. And, of course, it freezes well too, unlike the first two.

I buy and keep lots of buttermilk in my kitchen and it really does keep for a long time. But I do also use it all the time. I probably go through a half gallon bucket of it in about in a week in cooking. If it were just me I would never buy sweet milk at all . I have zero use for that for myself.