Dairy cows in Ferndale, California, home to three dairy operations that have gone completely grain-free.

Nestled near the southern end of California’s Humboldt County, Ferndale, California, is known for its grass—but not the kind that might immediately come to mind. The valley surrounding Ferndale is carpeted in pastureland, and dairy farmers have been tending to the grass there, and the cows that graze in it, day in and day out for generations.

So when Organic Valley—the large Wisconsin-based dairy cooperative—decided to start selling an all-grassfed milk, it’s no surprise they looked to the farmers of Ferndale. With grazing potential almost all-year long, most dairy cows in the area already eat much more of this green living food than average. But now their grassfed milk—and other milk like it—will have the chance to stand out to consumers.