Dairy farms are a thriving segment of the agricultural economy of Sierra County.  Much of the output of the county's 3,000 acres of alfalfa and 1,200 acres of corn production goes to supporting these farms.  Alfalfa is harvested several times each year and made into large bales of alfalfa hay.  Corn is harvested and chopped into silage.  This dried feed for the dairy cows can be stored for many months.