Stacking large round bales usually increases losses. Stacking tends to trap moisture and limits drying action from exposure to the sun and wind. Locate bale rows away from fences and tree lines to avoid contact with snow drifts. Keep livestock and other animals away from bales. Prevent weed growth around bales.
Weeds shade the bales and can cause snow drifts.
Remember that the outer four inch thick layer of a 6 ft. diameter round bale contains about 25 percent of the total bale volume. Studies have shown outdoor storage losses range between five and 35 percent depending on the amount of precipitation, storage site location, and original condition of the bale. Beware of the side forces which stacked, large round bales can exert on the walls of storage structures. Kenneth R. Bolen, Director of Cooperative Extension, University of Nebraska, Institute of Agriculture and Natural Resources.