3equines
Posted : 5/10/2011 8:39:20 AM
Living in coastal WA and western OR, tarping hay causes it to mold where the tarp and hay make contact, so that has never worked for me. In drier climates it is more effective. Use a canvas style tarp if you must tarp it - something that 'breathes'.
The best way to keep hay is to have a large quantity stored in a shelter with walls, roof, and cement floor. Two layers of pallets with vapor barrier (tarp or plastic) on the bottom side of both layers will help prevent ground moisture from molding the hay regardless of whether the floor is cement or dirt. The larger the hay stack, the less moisture damage to the hay.
Stored in a dry building, the bottom layer is the only one that gets affected; I have 'cheated' this principle by buying cheap straw for my bottom run, which can be used as bedding as it is unburied from the haystack.
In the last place I lived, I eventually stopped trying to load all 4 to 6 tons into my barn at once. I found a reliable local hay dealer with a big hay barn and bought about 15 to 20 bales at a time - it was always clean and dry from being stored in the hay barn, and didn't sit around long enough at my place to get moldy. It was a pain to have to load and unload hay every few weeks (I was only feeding 3 horses then) but better than throwing out expensive hay.