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Grain stocks are released on a quarterly basis throughout the year, and they include wheat, barley, oats, and corn. Hay stocks are released twice a year in May and December.
Hay Stocks, May 2011-2013
05/14/2013: Agri-Facts - early May
Grain Stocks, March 2012-2013
01/14/2013: Agri-Facts - early April
Hay Stocks, December 2012
01/14/2013: Agri-Facts - early January