I just returned from several weeks in Brittany. I don't know if their cultured butter is grass fed but I can tell you that there are A LOT of green fields everywhere with cows grazing on them. So my guess is...probably. Perhaps some knowledgeable member knows if France is as gung-ho about factory farming and feedlots as we seem to be here. My instinct is that they are not, but it's just instinct. Wish I'd thought to ask while I was there.